LEAVES. 



85 



PLATE XXXVI. 



FIG. 46. Powdered Alexandrian Senna (x 240). 



co, CollenchymatouB cells. 



cr, Prismatic and cluster crystals. 



ei, Lower epidermis. 



e'i', Lower epidermis, sectional view. 



en, Neural epidermis. 



es, Upper epidermis. 



f , f p, Lignified pericyclic fibres. 



ffv, Debris of fibrovascular bundles. 



ip, Scar of hair. 



I, Bast. 



p, Hair, one-celled, conical and warty. 



pa, p'a', Palisade cells. 



st, Stornata with two cells parallel to the ostiole. 



tc, Rows of cells with prismatic crystals. 



tf , Cortical tissue of midrib. 



