66 THE JOUENAL OF INDIAN BOTANY. 



Veins provided with green sheaths. Glandular hairs multicellular and 

 capitate. Epidermis of the axis two-layered. Pericycle formed of 

 rhomboidal stone-cell groups. Wood composite. Soft bast forming 

 a continuous ring. Pith formed of thin-walled cells. 



Cadaba indica Lam. Figs. 30, 31, 32, 33, 34, 35. Woody. 

 Outer walls of the epidermal cells of the leaf greatly thickened and 

 papillose. Guard-cells in the plane of the surrounding cells. Meso- 

 phyll formed wholly of short palisade cells. Internal glands in the 

 leaf in the form of parenchymatous cells with tanniniferous contents. 

 Veins not provided with sheaths. Water-storing tracheids occurring at 

 the terminations of the veins. Clothing hairs peltate. Glandular 

 hairs absent. Outer walls of the epidermal cells of the axis super- 

 ficially granulated and lateral walls thickened. Pericycle formed of 

 rhomboidal groups of stone-cells. Wood forming a composite ring ; 

 soft bast forming a continuous ring. 



Capparis decidua Pax. Figs. 27, 36, 37. Woody. Leaves oc- 

 curring only on young shoots. Epidermis of the leaf and axis formed 

 of vertically elongated highly thick -walled cells. Mesophyll isobilat- 

 eral with an extensive middle tissue of parechymatous cells. Inter- 

 nal glands in the form of numerous cells with tanniniferous contents. 

 Veins not provided with sheaths. Pits present in the epidermis of the 

 axis. Assimilatory tissue in the axis formed of palisade cells. A ring, 

 1-2 cell thick, of sclereids occurring below the assimilatory tissue. 

 Pericycle formed of rhomboidal groups of stone-cells. Wood formed 

 of xylem bundles connected by strands of interfascicular wood- 

 prosenchyma. Soft bast forming groups. Pith composed of thin- 

 walled cells. 



Structure of the Leaf 



Epidermis.— Outer walls are thickened and somewhat papillose in 

 all members except Cleome viscosa (fig. 16.) The thickening and 

 papillose differentiation is considerable in Cleome papillosa (fig. 11), 

 Cadaba indica (fig. 30), Gynandropsis pentaphylla (fig. 22) and 

 Capparis decidua. Lateral walls are thin in all the numbers except 

 Capparis decidua, where they are thickned ; they are somewhat 

 undulate in all the members. Epidermal cells at the margin are round- 

 ed forming the marginal epidermis compact and rigid. Some of the 

 lower epidermal cells in Cleome brachycarpa are larger and longer than 

 broad, perhaps serving as water-reservoirs. Epidermal cells at the 

 margin and along the mid-rib are smaller than in the other part of 

 the leaf blade. 



Stomata are surrounded by four to six ordinary epidermal cells 

 (fig. 19) and are more numerous on the under surface. They are 

 placed in depressions formed by the outer thickened and papillose 



