Page:The Journal of Indian Botany.djvu/487

 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. Mesophyll 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