166 THE JOURNAL OF INDIAN BOTANY. 



veins apposed to the stereome girders except a few very small 

 ones. A few larger veins vertically transcurrent above and below by 

 stereome. Bundle-sheaths, when present, internal. Mechanical 

 tissue in the leaf in the form of isolated subepidermal girders below 

 the veins, and of a few isolated girders on the upper side placed at 

 regular intervals. T. S. of the axis triangular. Assimilatory tissue in 

 the axis forming arcs or girders of palisade cells round the peripheral 

 bundles. Mechanical tissue in the axis in the form of isolated 

 sub-epidermal girders, larger ones alternating with the smaller. 

 Ground tissue not differentiated in the centre into pith. 



Cypems arenarius Retz. — Margins bluntly pointed without 

 any supporting stereome bundles. Stomata only on the lower surface 

 and with the front cavity depressed. Obconical groups of elongated 

 cells occurring below the epidermis even in the absence of stomata. 

 Veins embedded. Smaller veins near the lower epidermis. Bundle- 

 sheaths, when present in leaf or axis, internal. Mechanical tissue in 

 the form of isolated sub-epidermal girders below smaller veins. T. S. 

 of the axis circular. Assimilatory tissue in the axis forming arcs or 

 girders of palisade cells round peripheral bundles. Mechanical tissue 

 in the axis forming numerous isolated girders, larger ones alterna- 

 ting with the smaller. Ground tissue not differentiated in the centre 

 into pith. 



Cyperus conglomeratus Rottb.— Figs. 300, 301, 302. Mar- 

 gins bluntly pointed and supported by stereome bundles. Extensive 

 articulation tissue on the upper side. Stomata only on the lower 

 surface. Front cavity depressed. Obconical groups of elongated 

 cells occurring below the epidermis even in the absence of stomata. 

 Bundle-sheaths, when present, internal. Veins embedded and ar- 

 ranged in an alternating fashion in two rows. Smaller veins nearer 

 the lower epidermis. Mechanical tissue in the leaf in the form of 

 isolated sub-epidermal girders below all smaller veins and of a single 

 long sub-epidermal girder on the upper surface near the margin. T. S. 

 of the axis circular. Assimilatory tissue, in the axis forming arcs 

 or girders of palisade cells round the peripheral vascular bundles. 

 Mechanical tissue of sub-epidermal girders, alternating with the peri- 

 pheral bandies and apposed to the girders. A few vessels enclosed in 

 a thick ring of stereome in the ground tissue. Ground tissue differ- 

 entiated in the centre into pith. 



Cyperus rotundus L — Figs. 303, 304, 305, 306, 307. Margins 

 rounded and without supporting stereome bundles. Upper epidermis 

 modified into articulation tissue. All veins embedded. Larger veins 

 nearer the lower epidermis and the smaller ones in the middle of the 



