THE 



Journal of Indian Botanp* 



Vol. II. MAY, 1921. No. 3. 



THE PHYSIOLOGICAL ANATOMY OF THE 

 PLANTS OF THE INDIAN DESERT 



BY 



T. S. Sabnis, B.A., M.Sc, 



St. Xavier's College, Bombay. 



N! \V YORK 



'AKiCAL 

 {Continued from p. 13.) o-\WI>FN 



BORAGINACEAE 



Ehretia aspera B.— Figs. 202, 203. Woody. Mesophyll isobi- 

 lateral. Veins provided with bundle-sheath. Tanniniferous secretions 

 in the sheath cells and in cells of the middle tissue. Hairs unicellular 

 and with verrucose walls. Pericycle of large groups of stone-cells. 

 Bast fibres in soft bast. Pith of cells with lignified walls. Solitary 

 crystals in some of the pith cells. 



Heliotropium supinum L. — Fig. 204. Herbaceous. Meso- 

 phyll of palisade tissue on the upper side and of arm-palisade tissue 

 on the lower. Veins provided with bundle-sheaths. Hairs unicellular 

 and with verrucose walls. Middle tissue absent. Pericycle of groups 

 of bast fibres. Pith of thin-walled cells. 



Heliotropium rariflorum Stks.— Pigs. 205, 206, 207, 208, 

 209, 211. Woody. Mesophyll isobilateral- Veins provided with bundle- 

 sheaths. Bundle-sheath cells and cells of the middle tissue with 

 tanniniferous contents. Pericycle of groups of stone-cells. Pith of cells 

 with lignified walls. Some of the pith cells with solitary crystals. 



Heliotropium undulatum Woodr. — Pigs. 212, 213, 214 

 Woody. Mesophyll isobilateral. Middle tissue present. Clustered 

 crystals in the mesophyll. Trichomes with terminal cell curved and 



