eChapters

Vector data analysis is performed to convert raw input vector data to output that provides new and meaningful information which ultimately supports decision making and disclose hidden patterns. There are various techniques to analyse vector data like buffering, intersect, union, and so on. Some of the most commonly used techniques with their R-code examples are explained in this chapter.

First of all, you need to import all the packages which are required for performing this exercise. These packages include rgdal and sp for importing and re-projecting vector data as well as raster and rgeos for performing vector analysis operations.

Mosaic is the combination of two or more raster images into single image. Sometimes, single image captured by remote sensing satellite doesn’t completely covers the desired study area mostly. Therefore, users resort for mosaicking two or more images captured by satellite sensors from different paths so that the whole study area is merged into a single raster image to facilitate the image processing and analysis. The pixel size of the raster images should be same for mosaicking.

In most of the cases, there is spatial overlapping among the raster images from which we want to create mosaic. These overlapping areas are handled in multiple ways which is being discussed further using R – code example. For mosaicking raster images in R, mosaic function of the raster package is used.

Many times, users have to work with raster datasets of different spatial and radiometric resolutions. So, there is requirement of bringing their resolutions to the same resolution in order to facilitate their processing. Resampling is the process of deriving pixel values from the existing image to the new raster image of different pixel size. Resampling is most common pre-processing step in remote sensing. It is done both at spatial and radiometric scale. At spatial scale, resampling is done either to increase the spatial resolution i.e. decrease pixel size known as Upsampling or to decrease the spatial resolution i.e. increase pixel size known as Downsampling. Radiometric resampling is performed to increase or decrease the radiometric resolution of the image. In R, resampling of raster image is performed by raster package. The details of the resampling methods and their respective R – code with examples are discussed in this chapter.

First of all, we need to import the raster image on which we wish to perform resampling operations by using following R – code. In R, resampling is feasible on one band only. So, we will import single band raster image.

The calculation of raster data statistics is very essential before performing some geoprocessing operations. Raster data statistics involve knowing the distribution of pixel values in a band, comparing the pixel values of two bands, extracting values of all bands for a particular geographical location or point, and computing statistics like mean, median, standard deviation, etc. at pixel level across all bands of raster dataset.

In R, codes to perform raster data statistics are present in raster package. The visualisation of raster data statistics can be done by rasterVis package. So, we need to import these packages in R in order to perform this exercise.

The sensors present over remote sensing satellites are designed to collect energy or radiance from the varied surface features having wide range of radiance i.e. from features like water bodies having very low radiance to features like sand or snow having very high radiance. But, most of the time, the study area may not have all these features; therefore, radiance values may remain confined to a narrow range. This reduces the contrast of the image, thereby decreases its visual quality. In this context, image contrast enhancement techniques are used for effective visualization and display of remote sensing image on computer screens or hard copy so that maximum amount of information can be derived through its visual interpretation.

Contrast enhancement of a digital image is a technique to modify the original grey levels of input image to the entire available range of the grey levels. This increases the contrast between various features in the image which improves the visual quality of original image. Contrast enhancement can be done by both linear and non-linear methods. Some of the commonly used contrast enhancement techniques with their implementation in R software are discussed in this chapter.

We need following packages for performing this exercise in R. raster package is required for importing of raster image and for performing contrast enhancement. RStoolbox package is also required for contrast enhancement as well as for visualization of raster data with ggplot2 package. rasterVis package is mainly used in this exercise for plotting histogram of the raster data.

Remote sensing images have an important characteristic known as spatial frequency. Spatial frequency is defined as the number of changes in pixel value per unit distance. Few changes in pixel or brightness value over an area in an image are known as low spatial frequency area like agricultural fields, forests, water bodies, etc. If the changes are large, then it is known as high frequency area like roads, built up areas, etc. Spatial filtering is an approach for extracting quantitative spatial information by taking into account the neighbouring pixel values along with the independent pixel value. Therefore, filtering is a technique for modifying or enhancing an image. Filtering is done to improve the interpretability of raster image or to extract certain information from them. It is a neighbourhood operation because the value of any pixel in the output image is determined by applying certain algorithm on the neighbourhood pixels of the corresponding input pixel. The nature of algorithm to be applied depends upon the information which user wants to derive from the raster image. Filtering operations are mainly done for smoothening, sharpening, noise removal and edge enhancement. A filter is a kernel of small array which is applied to input pixel and its neighbouring pixels in the raster. There are many types of filters which can be applied to a raster image in R. These types with their respective R – code examples are explained further.

Raster transformations involve mathematical manipulation of raster layers to generate new raster images. These transformed raster images either contain the information of interest or highlight the features which are not discernible in the original image. Transformations are also performed to preserve the essential information in reduced number of dimensions or layers. In this chapter, we are going to discuss few most commonly used transformation tools listed below:

Unsupervised classification is the technique of classification of raster data in which no prior information is provided by the user. Raster data is classified based on their spectral characteristics such that the pixels having similar spectral properties in the multispectral feature space are grouped together in one class. Unsupervised classification is mainly performed by clustering algorithms. The purpose of these algorithms is to minimize within cluster variability and maximize between clusters variability. The user must interpret and label the classes after performing unsupervised classification. This method of classification requires minimum data which makes it easy and quick, but user has toput efforts in identification of the classes. This method could be useful when user doesn’t have any prior knowledge about the study area. This method removes subjectivity and enables us to get the unique classes which might be unrecognized by the user. K-means is the most commonly used method for performing unsupervised classification. In this chapter, we have discussed K- means, CLARA and unsupervised random forest method for classification of raster data in R.

Supervised classification is the technique to classify raster image in which prior information about the classes in the form of training sites is provided by the user. Training site represents a homogeneous area in a particular class. The spectral response pattern of training sites is used to classify the raster image.The pixels of raster imagewhich have spectral response pattern similar to that of training sites of a particular class are grouped in that class. As there is some variability in the spectral response pattern of a particular class, therefore, multiple training sites per class are taken for supervised classification. Supervised classification of raster images can be performed by various methods. Conventional methods include maximum likelihood classifier, minimum distance to mean classifier, and parallelepiped classifier. Now a days, machine learning algorithms are also gaining importance in this context. These classifying algorithms are first trained or calibrated using the data of training sites.This trained model is then validated on the independent datasets for accuracy assessment. If the accuracy of the developed model is of acceptable level, then that model is used for the classification of raster data.

In this chapter, we are going to discuss the execution of maximum likelihood classifier and few machine learning techniques for supervised classification of raster image in R software. The training sites used in this exercise are in the form of points shapefile. The raster image is classified into six classesi.e. built- up, fallow soil, riverine sand, salt-affected soil, vegetation, and water. For performing this exercise, first of all,set the working directory and import the required packages.

Elevation or height data of land surface above a defined vertical datum is stored in the form of raster grids which is known as Digital Elevation Model (DEM). The DEM data can be processed to derive many useful parameters like slope, aspect, curvature, roughness, etc. This process of quantitatively describing terrain obtained from DEM data through computation of many variables is known as Digital Terrain Analysis. Digital terrain analysis has applications in the various fields like hydrology, ecology, geomorphology, etc. DEM data for digital terrain analysis are available from the satellites like ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer), Cartosat, ALOS (Advanced Land Observation Satellite), and SRTM (Shuttle Radar Topography Mission).

In this exercise, we are going to discuss the derivation of some primary and secondary terrain attributes from DEM data in R software. For performing digital terrain analysis in R, following packages are required.

Maps make it easier to interpret and communicate the results of any GIS analysis. R has a large number of packages for making thematic maps. Static mapping is straightforward with plot()methods provided by core spatial packages sf and raster. The use of plot() function have been discussed in the previous chapters. Another package for mapping isspwithspplot() having enough options for producing good quality thematic maps.It is also possible to create advanced maps using ggplot2. This chapter discusses, separately, preparing thematic maps from vectors and rasters with the above mentioned packages. A dedicated map-making package tmaphas been given special focus in this chapter.

Family : Amaranthaceae

Flowering : October-December

Fruiting : December-January

Botanical description

The plant is an erect, straggling or subscandant herb. The leaves are ovate, elliptic, obtuse, acute and finely attached to the stem on both sides. The flowers are greenish white in colour, bracteolate having membranous blade and seeds are reddish brown in colour, sub-cylindric at apex and rounded at the base.

Family : Euphorbiaceae

Flowering: July-September

Fruiting: September-December

Botanical description: The plant is a small erect herb, growing up to 60 cm or more. The ascending branches are angled and velvet-hairy. Leaves are broadly ovate, nearly triangular, rather coarsely toothed. Leaf stalks are as long as or longer than the 3-5 cm long blades. Flowers are stalkless, borne on erect axillary spikes longer than the leaves. Male flowers are minute, crowded distally. Female flowers are scattered along the inflorescence axis, each subtended by a conspicuous semicupular leaf-like toothed green bract nearly 7 mm long. Capsule is bristly and1 mm broad.

Ecology: It is mostly found in hot, low to medium altitude, sandy margins of rivers, seasonal water courses and pans, usually in shade of thickets, on rocky hillsides and often in disturbed ground and as a weed of cultivation.

Family : Amaranthaceae

Flowering: August-October

Fruiting: November-January

Botanical description: The plant is a perennial sub-erect, diffuse or prostrate herb, growing upto 0.3-2 meter high, branched from the base and often also from above. Stem and branches are densely woolly with whitish or yellowish, shaggy hairs. Leaves are alternately arranged, nearly circular to lanceo shaped-elliptic, wedge-shaped at the base, rounded to sharp at the tip. Flower spikes are stalkless, solitary or usually in clusters in leaf axils, silky white to creamy in colour, forming a long inflorescence leafy to the ultimate spikes.

Ecology: This plant is commonly found in open forests on mountain slopes, on waste and disturbed ground and coastal scrubs. The plant is widespread in drier parts of the tropics and subtropics.

Use: Leaves are collected, fried and then eaten

Family : Amaryllidaceae

Flowering: December-January

Fruiting: January-February

Botanical description: It is a herb. The leaves of the plants are cylindric, fistular and look like tubes. Flower of the plant is white or greenish white with a short pedicel.

Ecology: The plant is commonly cultivated along the river banks during winter season. The plant loves to grow in sandy and loamy soil.

Use: Young leaves and shoots are collected, fried then eaten. The leaves and the flowering stalks are used for various preparations and curries.

Family : Amaryllidaceae

Flowering: November-December

Fruiting: January-February

Botanical description: The plant is a herb. The leaves of the plants are flat, linear with sheaths, about half of their length. Flower of the plant is white or greenish white with a short pedicel. The plant is having bulbs with membranous outer scales in the axils of which do exist 10-12 lesser bulbs.

English Name: Node Flower Allmaina

Family: Amaranthaceae

Flowering: May-June

Fruiting: June-July

Botanical description: The plant is an annual herb. It is erect and rising, 10-50 cm tall. Stem is branched from or near the base. The Leaves are obovate, oblong, or linear with 1.5-6.5 mm long and 0.3-2.5 cm wide. Flowers of the plant are greenish or orange-red in colour with 3-7-flowered cymes. Seeds are single, black and shining with 1.5-2 mm in diam.

Ecology: The plant is a common weed widely distributed in forests and cultivated lands.

Family: Amaranthaceae

Flowering: July-October

Fruiting: November-January

Botanical description: The plant is a perennial herb. The plant is a much branched prostrate herb, branches often purplish, frequently rooting at the lower nodes. The leaves are simple, opposite, somewhat fleshy, lanceolate, obtuse or subacute, glabrous and shortly petiolate. The flowers of the plant are small, white and in axillary clusters. Fruits are compressed obcordate utricles, with suborbicular seeds.

Family : Amaranthaceae

Flowering: Most part of the year

Fruiting: Year round

Botanical description: The plant is an evergreen creeper, herbaceous and perennial, growing up to 15 – 30 cm in height and spreading to form a growth mat about 45cm wide or more. Stems are prostrate or erect and moderately branched, hairless below, generally hairy above and in leaf-axils. The leaves are inverted-lanceolate or narrowly elliptic, acute at apex, narrowed at the base into a poorly defined petiole, mostly 2-6 cm long and 0.6-2.0 cm wide. Round or short-cylindrical flower heads lie stalkless in leaf axils, 5-10 mm long and 5-7 mm wide.

Use: Young leaves and shoots are collected, fried and eaten as green vegetables

Family: Amaranthaceae

Flowering: November-December

Fruiting: January-March

Botanical description: The plant is a herb, reaches heights of over 1 meter tall with fleshy oval shaped leaves that are sometimes pointed at the tips. It is having a deep maroon colour in the center of the leaf with streaks of red, purple and green. The plant produces feathery purple, magenta or red flowers from the central stalk which is packed with edible seeds. The flower buds are edible, once they mature and become bushy.

Ecology: The plant is commonly used as leafy vegetables and cultivated throughout the country. The plant loves to grow in the sandy soil in winter season. It is also cultivated in left over potato fields.

Use: Leaves and young shoots are cut into small pieces, cooked with salt and chilly and then eaten. Sometimes the leaves and shoots are mixed with vegetables in cooking.

Family: Amaranthaceae

Flowering: June-August

Fruiting: September-November

Botanical description: The plant is an annual erect herb that grows upto 1 meter in height. The stem is grooved and often redish. The leaves are long-petioled, ovate or elliptic, acute or subacute with base shortly cuneate to attenuate. The flowers are in axillary and terminal red or green panicled spikes with up to 20 cm long. Seeds are black in colour, shining and compressed or subspherical with thick margin.

Ecology: The plant being commonly used as leafy vegetables, is cultivated throughout the country. The plant loves to grow in soil rich with organic materials. The plant is commonly cultivated in summer and it grows luxuriantly in rainy season.

Family: Amaranthaceae

Flowering: June-August

Fruiting: September-December

Botanical description: The plant is an annual herb with sometimes red tinged erect stems, sometimes ascending, 30-150 cm long, usually branched. The leaves are ovate to rhombic- ovate, elliptic, lanceolate-oblong, or lanceolate, blades 1-12 cm long, 0.89-6 cm wide and smooth. The stem and its branches carry spines. Flowers of the plant are green, and are in axillary clusters in the lower part of the plant and in unbranched or branched spikes in the upper part. The lower clusters are entirely without stamens as the lower flowers of the spikes, the upper flowers in the spikes are staminate. Seeds are dark brown or black in colour.

Family: Amaranthaceae

Flowering: June-August

Fruiting: September-December

Botanical descripion: The plant is an erect tropical annual herb with long-stalked leaves, growing up to 5 ft tall. The leaves grow up to 5 inch long, are notched or rounded at the tips. The flowers are whitish-green or red white, the seeds are very small, shining, black or red- brown in colour.

Family: Amaranthaceae

Flowering: Throughout the year

Fruiting: Throughout the year

Botanical description: The plant is an annual herb with erect stems growing upto 10-80 cm in height. The leaves are triangular-ovate to narrowly rhombic, 2-7 cm long, 1.5-5.5 cm wide, hairless, with a narrow and small narrow notch. The flowers of the plant are green, in slender, paniculate spikes, in leaf axils or at the end of branches. Fruit is nearly round, about 1.3-1.5 mm in size.

Ecology: The plant is a fairly common weed on waste ground and roadsides and distributed throughout India. The plant is also cultivated during summer season.

Use: Leaves and young shoots are collected, roasted and eaten

Family: Acanthaceae

Flowering: September-December

Fruiting: January-April

Botanical description: The plant is an erect annual herb extremely bitter in taste (all parts of the plant). It grows erect to a height of 1-4 ft. with dark stem. The leaves are glabrous, lanceolate, pinnate, with 8.0 cm long and 2.5 cm broad. Flowers of the plant are small, white-purple or spotted purple in colour, spreading axillary and terminal racemes or panicles and acute at both ends. Seeds numerous, sub quadrate and yellowish brown in colour.

Family: Araceae

Flowering: July-August

Fruiting: November

Botanical description: The plant is a herb, growing about 90 cm in height. It produces 2 - 3 leaves, 5 - 30cm or more in size with a flowering stem 30 - 50cm long. Leaflets are lanceolate, acuminate and oblique, uniting in an intramarginal nerve. Fruiting head 5 cm long, ovoid, berries are initially green clustered fruits finally ripening to bright red.

Family: Meliaceae

Flowering: February-May

Fruiting: June-July

Botanical description: The plant is a tree. The leaf of the plant is about 20-38 cm in length, leaflets 5-9 pairs and obliquely lanceolate. Flower is white in colour and fragrant. The plant bark, leaves and flowers are bitter in taste.

Family: Poaceae

Flowering & Fruiting: The plant flowers after about 90-100 years. Flowering and fruting occurs in wet season

Botanical description: The plant is a perennial tree growing up to 20-53 m in height and 8-18 cm in diameter. There are 1-3 spines at each branch node. Leaves are thin, linear, up to 20 cm long, 1-1.8 cm wide with a long pointed tip. The branches of the plant spread out from the base and areal roots reaching up to nodes. The length of the internodes is about 15-46 cm and is hollow.

Ecology: It is cultivated and naturalized throughout India. Plant loves to grow in moist soils.

Family: Basillaceae

Flowering: May-September

Fruiting: October-February

Botanical description: The plant is a twining succulent herb with green stem and petioles. Leaves of the plant are broadly ovate and green to purplish in colour. Flowers are pinkish or purple in colour. Fruits are berries, ovoid or depressed-globose, turns black after ripening with deep purple juice.

Family: Caesalpiniaceae

Flowering: September-February

Fruiting: February-March

Botanical description: The plant is a moderate sized tree with ashy or dark brown bark. Leaves are often oblong, about 5-18cm, deeply lobed from one third way down to nearly the base with scarcely overlapping. Flowers are purple and large on terminal panicled racemes. Pods are 15-30×18-25 cm long, narrow below, somewhat broadening upwards.

Family: Caesalpiniaceae

Flowering: April-June

Fruiting: December-March

Botanical description: The plant is a climber growing up to 10-30 m long. The woody stem can get as thick as 20 cm. The spreading tout branches are covered with rusty fine hairs. The stout tendrils are coiling and occur in pairs. Large leaves are 10-45 cm, 2-lobed with a broad cut. The flowers are white, 2-3 cm across, turn yellow when old and borne in rounded clusters. Fruit is a flat woody pod with fine rusty hairs, 20-30 cm long.

Family: Caesalpiniaceae

Flowering: February-March

Fruiting: April-May

Botanical description: The plant is a moderate sized tree growing up to 20-40 ft tall and 10-20 ft wide with a spreading crown of briefly deciduous leaves which are 10-15 cm across and rounded with lobed ends and heart shaped bases. The leaves are shaped like a cow’s hoof. The flowers are white or purple in colour with one petal variegated yellow, 5-10 cm across and carried in clusters at the branch tips. The flowers often make their first appearance in late winter while the tree is bare of leaves. Seeds of the plant are sub-orbicular in shape.

Family: Cucurbitaceae

Flowering: October-November

Fruiting: December-January

Botanical description: The plant is a annual climbing herb, having stems up to 6 metres long that scramble over the ground or climb on other plants, supporting themselves by means of tendrils. Leaves are roundish, kidney-shaped, base deeply heart-shaped. Upper surface is rough, lower surface shortly bristly, 5-7-lobed, with long and hairy stalk. Tendrils are slender and rarely simple. Flowers are yellow in colour, calyx tube 10-15 mm long with spreading petals ending in a short point. Fruits large, succulent, densely hairy when young, with a thick waxy deposit when mature.

Family: Nyctaginaceae

Flowering & Fruiting: Most parts of the year, mostly dry winter season

Botanical description: The plant is a prostrate herb with diffuse inflorescences. The stem of the plant is glabrous or minutely pubescent and often purplish. The leaves are in unequal pairs, broadly ovate with obtuse or rounded apex. Flowers are very small, purplish red to reddish pink or nearly white, bell-shaped beyond the constriction.

Ecology: It is a common weed found near dry and warm river valleys; along roadsides, near habitations, in and along cultivated fields and in open cleared patches in forests. It is distributed throughout India.

Family: Brassicaceae

Flowering: September-November

Fruiting: December-February

Botanical description: The plant is an annual herb with stems reaching up to 1.5 m tall. Stems are erect, reddish-purple below, greenish-red above, hairless, arising from large thickened taproot up to 10 cm in diameter. Leaves are large alternately arranged and hairless, upper smaller. Lower leaves are up to 25 cm long, pinnately cut, with small prickles above and below. Flowers are yellow in colour, borne in racemes at the end of branches with 2 cm across. The pods are stout, 5-9 cm long bearing 30-80 seeds with whitish, yellow or brownish in colour.

Use: Leaves are fried with oil then eaten and also chopped leaves and stems are dried in shade, stored in an earthen pot for consumption.

Family: Brassicaseae

Flowering: November-February Fruiting: February-March

Botanical description: The plant is a herb with white edible mass of abortive flowers aggregated on thick branches of the inflorescence.

Ecology: It is widely cultivated as vegetable in the tropical countries including India. The plant grows in winter season.

Use: Leaves are fried or made into curry and consumed. Inflorescence is used in various types of preparations.

Family: Brassicaseae

Botanical description: The leaves of the plant is having stout nerves, densely congested into a subglobose or ellipsoid head which is edible.

Ecology: The plant is a herb, widely cultivated as vegetable in the tropical countries including India.

Use: Leaves are fried separately or with other vegetables, and then eaten

Nutritional Value: The plant is rich in vitamin B and minerals.The nutritional value of the plant is presented below. 100g of the plant leaves carries:

Family: Brassicaseae

Flowering & Fruiting: August-March

Botanical description: The plant is having a short stem, enlarging into a spherical edible tuber. Basal cauline leaves are broadly ovate, not overlapping on globose stem, about 10-45 x 3-25 cm across with cuneate base.

Ecology: The plant is a herb, widely cultivated as vegetable in the tropical countries including India. The plant loves to grow in late winter season.

Family: Amaranthaceae

Flowering: August-October

Fruiting: November-January

Botanical description: The plant is a herb, growing up to 60-75cm height, erect, branching with oval or lanceo-shaped, with hundreds of tiny flowers packed in dense spikes of silver- white flowers which usually stand above the foliage. They are beautiful plants with soft, dense feathery spikes, produced in profusion. Leaves are lanceolate, linear, acute to acuminate tapering into slender petiole. Seeds are several, black in colour and shining.

Family: Apiaceae

Flowering: August-October

Fruiting: November-January

Botanical description: The plant is a small creeping herb with shovel shaped leaves emerging alternately in clusters at the stem nodes. The runners lie along the ground and the inch long leaves with their scalloped edges rise above on long reddish petioles. The insignificant greenish- to pinkish-white flowers are borne in dense umbels (clusters in which all the flower stalks arise from the same point) on separate stems in the summer. The seeds are pumpkin-shaped nutlets 0.1-0.2 cm long.

Ecology: It is commonly seen in shady, damp and wet places such as paddy fields and in grass thickets and distributed throughout India.

Use: Leaves and young shoots are collected, roasted then eaten

Family: Chenopodiaceae

Flowering: November-January Fruiting: February-April

Botanical description: The plant is a fast-growing, upright and weedy annual herb. The leaves are variables in appearance. The first leaves, near the base of the plant, are toothed and 3-7 cm long and 3-6 cm broad. The leaves on the upper part of the flowering stems are entire and lanceolate-rhomboid with 1-5 cm long and 0.4-2 cm broad. The flowers of the plant are 1-1.2 mm across, in short axillary spikes and often forming a terminal thyrse. Seeds are black, depressed with an obscure horizontal keel.

Family: Fabaceae

Flowering: December-February

Fruiting: February-April

Botanical description: The plant is an annual herb, much branched and viscous hairy. The plant grows up to 20-50 cm high and has small feathery leaves on either side of the stem. The flowers are bluish purple in colour, 6-7 mm long on slender peduncles. Pods oblong, one seedpod contains two or three peas.

Family: Lauraceae

Flowering: January Fruiting: February

Botanical description: The plant is a moderate sized tree growing up to 10-20 metres. Leaves are mostely oblong, usually 10-12.5 cm long, acuminate or acute, glabrous with shining above and acute base. The flowers are 5-6 mm long with pubescent pedicel. The tepals are pubescent, deciduous in fruits.

Ecology: The plant is occasionally planted and commonly cultivated as vegetable in the tropical countries including India.

Use: Leaves are used in different curries and recipes for special aroma.

Family: Cleomaceae

Flowering: July-October

Fruiting: December-February

Botanical description: The plant is an erect herbaceous annual herb growing up to 1.5 m in height. Leaves are alternately arranged and stalked. Each leaf has 3-7 leaflets, which are pinnately dissected and stalkless. Inflorescence is quite showy, and is usually up to 30 cm in length. The flowers have long stalks, ovate or elliptic petals either purplish or white in colour. The fruit is a long-stalked, dry, spindle-shaped capsule. Seeds are many, 1.5 mm across, with a shallow and narrow cleft.

Family: Cleomaceae

Flowering: May-July

Fruiting: August-October

Botanical description: The plant is a tall annual herb growing up to a meter high, more or less hairy with glandular hairs. The leaves are compound, with 3-5 leaflets. Leaflets are obovate, elliptic-oblong, very variable in size. Flowers are yellow in colour, 10-15 mm across with 6-20 mm long pedicels. Fruits are 30-75 mm long, 3-5 mm broad, linear-oblong, erect, with tapering at both ends. Seeds many, 1.25mm across with dark brown colour.

Family : Araceae

Flowering: The plants flowers in Late wet season (September-October)

Botanical description: The plant is a tuberous bulb, herbaceous plant growing about 3-5 ft in height. The plant has large leaves. The leaves are heart shapes, 2-3 ft long with a long stalk of about 3 ft height. The flowers are yellowish-white spathes and spadixes are frequently produced.

Ecology: It is commonly found in damp, shady places and also cultivated. The plant is widely distributed throughout the hotter parts of India.

Family: Commelinaceae

Flowering: August-September

Fruiting: September-October

Botanical description: The plant is a small diffused or straggling herb. Stem usually with a line of pubescence. Leaves are linear, 3.7-7.5 cm long, acute or acuminate, glabrous with prominent midrib and acute-obtuse at apex. Flowers are blue in colour and very small. Capsules are oblong and 4.3 mm long. The capsule is having 2 seeds, 2.5 mm long, ellipsoid, cylindrical with white appendage at each end.

Family: Commelinaceae

Flowering: July-October

Fruiting: November-January

Botanical description: The plant is a diffuse, branched, sub-succulent herb growing upto 30-60 cm. Leaves are 3-5 x 2-3.5 cm in size, ovate or elliptic-ovate, base rounded or almost flat with blunt or pointed tip. Spathe is about 1.5 cm across, funnel-shaped, flat at apex and velvet-hairy. Sepals are nearly equal, about 2.5 mm long, outer ones linear, inner ones orbicular. Flowers are small, petals are blue in colour, larger ones about 4 x 4.5 mm with broadly ovate. The seeds are 5 and closely pitted.

Family: Tiliaceae

Flowering: July-September

Fruiting: October-November

Botanical description: The plant is an erect, annual herb reaching up to 1-2 m height. The stems are usually purplish white. Leaves are ovate-lanceolate, 5-12 cm long, pointed at the tip and rounded at the base. The flowers are borne in small groups in the axils of the leaves about 4 mm long. The capsules are round to ovoid and about 1 cm in diameter.

Family: Apiaceae

Flowering: December-January

Fruiting: February-March

Botanical description: The plant is a herb, growing to a height of about 2 feet with a spread of 9 inches. The leaves are bright green in colour, fan shaped and become more feathery towards the top of the plant. The flowers are small and white, formed in umbel-like clusters. Fruit is globose, glabrous and seeds are flattened dorsally in transaction.