Page:The Journal of Indian Botany.djvu/221



Tribulus terrestris L.— Figs. 68, 69, 70. Epidermal cells tabular with outer and inner walls convexly arched outwards and inwards, respectively. Guard-cells elevated. Veins embedded and provided with bundle-sheaths, of thick-walled chlorophyll containing cells. Mesophyll composed of palisade tissue on the adaxial side and of subepidermal aqueous layer and palisade tissue on the abaxial side. Clustered crystals occurring in the leaf and axis. Clothing hairs unicellular on the leaf and axis. Primary cortex forming an aqueous tissue. Wood composite. Wood prosenchyma enclosing the end of the xylem bundles. Pith formed of thick-walled cells.

Tribulus alatus L.— Epidermal cells tabular with outer and inner walls convexly arched outwards and inwards respectively. Outer walls superficially granulated. Guard-cells elevated. Mesophyll formed of palisade tissue on the adaxial side and subepidermal aqueous layer and palisade tissue on the abaxial side. Veins embedded and provided with bundle-sheaths of thick-walled chlorenchymatous cells. Clustered crystals in the leaf and axis. Wood composite. Wood parenchyma enclosing the lower ends of the xylem bundles, Pith. formed of thin-walled cells.

Seetzenia orientalis Dene —Figs. 71, 72, 73, 74. Epidermal cells tabular, Large water-storing cells intercalated amongst the ordinary epidermal cells. Stomata depressed. Mesophyll formed of