POACEAE. 



15 



I'anicle ovoid, tho hranc-lies wide-spreading at maturity. 

 I'anlcle oljlonjr, the hraiichos erect. 

 Innovations extravaKinal. Ilie long stolons stout and scaly : 

 spikelets obliiiue to the pedicels, the ai>ex decidedly 

 curved, hence inequilateral. 



VI. DlCIIOTO.MA. 



Blades of the stem-leaves long and narrow, linear and 

 narrowed at both ends, very different from the 

 early basal ones. 

 Leaf-blades erect. 



I'rimary leaves of the stem with blades usually less 

 than 4 mm. wide, from 25-50 times as long as 

 broad. 

 Primary leaves of the stem with blades exceeding 

 4 mm. in width, 20 times as long as broad 

 or less. 

 Stems simple, or sometimes sparingly branched 

 at the nodes : plants usually bright green : 

 hairs on the leaf-sheaths reflexed. 

 Stems at length repeatedly dichotomous- 

 branched, forming dense mats : plants 

 grayish green : hairs on the leaf-sheaths, 

 if any, ascending or appressed. 

 Spikelets broadly obovoid, about 2 mm. long, 



obtuse. 

 Spikelets obovoid, about 3.5 mm. long, acute. 

 Leaf-blades widely spreading. 

 Blades of the stem-leaves not long and narrow, usually 

 lanceolate to ovate-lanceolate, sometimes short and 

 linear. 

 Stems simple, or rarely a little branched at the lower 

 nodes, forming dense tufts. 

 Leaf-sheaths hirsute. 



Leaf-sheaths glabrous, excepting the ciliate margin ; 

 blades strongly and beautifully ciliate on the 

 margins, otherwise glabrous. 

 Stems tlnally branching at the upper nodes, often 

 repeatedly branching. 

 * Middle leaf-blades of the main stem less than 

 1.5 cm. in width, usually less than 1 cm. 

 wide, the base rounded or truncate, some- 

 times in the broadest ones cordate. 

 t Leaf-sheaths glabrous or puberulent, the lower 

 ones sometimes with a few scattered long 

 hairs, the margins often ciliate. 

 Stem-nodes barbed. 

 Stem-nodes naked. 

 Spikelets glabrous. 



Spikelets less than 1.5 mm. long 

 Spikelets about 2 mm. long. 

 Spikelets pubescent. 



Spikelets less than 2 mm. long. 



Leaf-blades ciliate for at least V2 

 their length. 

 Panicle ovoid : spikelets few. 

 1.75 mm. long: leaf-blades 

 small. 

 Panicle oblong : spikelets nu- 

 merous, 1.3mm. long: leaf- 

 blades large. 

 Leaf-blades naked on the margins, 

 or sometimes with few long 

 hairs at the very base. 

 Larger stem-leaves with blades 



8-15 mm. wide. 

 Larger stem-leaves with blades 

 rarely over 6 mm. wide. 

 Leaf-blades with broad car- 

 tilaginous thickened 

 white margins. 

 Stem with the upper 

 portion naked, the 2 

 leaves below the 

 middle. 



0. /'. (lyrostoidcs. 

 1<». J', condcnsum. 



11. P. anceps. 



12. P. (jhihrifolium. 



14. P. laxiflorum. 



15. P. ncuranlhum. 



16. /*. fusiforme. 

 28. P. cquilutcrulc. 



14. P. laxiflorum. 

 13. P. polycuulon. 



10. P. suhharhuUiium. 



23. P. caerulesccns. 

 17. P. Nashianum. 



17. P. Nasliiamim. 

 24. P. ercctifolium. 



24. P. ercctifolium. 



21. P. albomargitiatum 



