570 A TEXT-BOOK OF BOTANY. 



and elliptical ; the flowers are pale yellow, sessile and axillary ; 

 the fruit is a small, somewhat cylindrical, hairy pod or legume. 

 The gummy exudation constitutes the Tragacanth of commerce. 



Acacia Senegal, which yields gum Arabic or acacia gum, is 

 a small tree with bipinnate leaves which are subtended by curved 

 spines ; the flowers are yellow and in dense spikes ; the fruit is a 

 broad pod containing five or six seeds. 



Acacia Catechu is a small tree which resembles Acacia Senegal 

 and furnishes Black Catechu. ' 



Km 



FIG. 320. Acacia Senegal: A, flowering branch: B, a single flower showing numerous 

 stamens; C, part of legume showing attachment of seeds; D, E, sections of seeds. 

 Alter Taubert. 



Pterocarpus Marsnpium is a fine timber tree with spreading 

 branches. The leaves are 5- to 7-foliate, the leaflets being cori- 

 aceous, obovate, and emarginate ; the flowers are pale yellow, and 

 the fruit is an indehiscent, orbicular pod with a single reniform 

 seed. The official Kino is prepared from the juice. 



The trees yielding kino are under State control in Madras. 

 According to v. Hohnel the kino is present in special cells in the 

 bark, which are arranged in radial rows in the region of the lep- 

 tome. The cells are from 50 to ioo/x wide and from 100 to 



