244 THE JOURNAL OF INDIAN BOTANY. 



Anomolous structures are represented by cortical vascular bund- 

 les in C. Burhia, fig. 101. 



General Beview 



Outer walls of the epidermal cells are thickened and cuticuiarised. 

 Spongy tissue is greatly diminished and the ventilating system is 

 greatly reduced. Water-storing tissue is extensive in the leaf and 

 occurs either in the epidermis or in the palisade tissue, or in the 

 middle of the mesophyll. Tannin sacs are abundant. Secretory 

 cavities are represented by intramural glands in Psoralen odorata. 

 Oxalate of lime is not found in the leaf or axis. The system of 

 veins is poorly developed. Clothing hairs are never unicellular ; 

 they are uniseriate trichomes, either simple, or hooked, or armed. 

 Glandular hairs are either club-shaped or spherial and are not 

 abundant. 



The pericyle forms a composite ring either of groups of bast fibres 

 or of stone-cells. Vessels have simple perforations and are not numer- 

 ous. Inter fascicular wood prosenchyma is abundantly developed 

 forming the ground work of the vessels. Wood parenchyma is poorly 

 developed. Medullary rays are usually uniseriate and numerous. 



The pith consists of thin-walled or thick-walled and lignified 

 cells. 



Anomelous structures are represented by cortical vascular bundles 

 in 0. burhia. 



CAESALPINEAE 



Cassia obovata, Goliad.— Figs 118,119. Epidermal cells with 

 outer walls papillose. Stomata occurring on both the surfaces. 

 Mesophyll isobilateral. Veins embedded. Clothing hairs unicellular. 

 Assimilatory tissue formed of chlorenchyma. Vessels large. Medullary 

 rays uniseriate. Pith formed of cells with thickened and lignified 

 walls. 



Structure of the Leaf : — The epidermal cells have outer walls 

 drawn out into large papillage, fig. 118. The stomata are equally 

 numerous on both the surfaces. Guard-cells are situated in the plane 

 of surrounding cells ; and the front cavity is placed in a deep depres- 

 sion formed by the outer papillose epidermal walls. 



The mesophyll is isobilateral. The palisade tissue on the adaxial 

 side consists of longer cells than those on the lower surface with 

 transversely elongated cells between. The veins are embedded. The 

 large veins are protected above and below by sclerenchyma ; the 

 smaller ones have large strands of sclerenchyma only on the lower 

 side. 



