iX_' Memoirs Hcniicc P. Bisliof' Miisciiiii .' 



lating a third .iiluiiic. iK-ariiii,' in its axil a membranaceous or hyaline palea and sometimes a 

 staminate flower, the ])alca rarely wanting; fertile lemma chartaceons-indurate. typically obtuse, 

 the nerves obsolete. t!ic marLrins inrolled over an inclosed palea of the same texture, a lunate 

 line of thinner texture at the back just above the base, the rootlet protruding through this at 

 sjermination. Annual or i)erennial grasses, of various habit, 

 rianis annual. 



Spikelcts glabrous ' • P- faunei. 



Spikekts ])ubescent. 



S])ikelets densely long-villous. 



Culms and leaves glabrous or puberulenl, the nodes bearded 2. P. beecheyi. 



Culms and leaves densely soft-villous .V P- torridiun. 



Spikclets s])arsely short-villous or densely long-villous only at tiie U\). 

 Culms and leaves puberulent or glabrous. 



Spikelets with a tuft of long hairs at apex; leaves puberulent. .4. P. nubigenum. 



Spikelets sparsely villous all over: leaves glabrous 5. P. kauaiense. 



Culms and leaves villous or hispid. 



Leaves papillose-hispid: spikelets acuminate. 2.5 nun. long (>. P. pellitum. 



Leaves den.sely short-villous; spikelets acutish. 1.5 mm. long 7. P. lanaiense. 

 FMants perennial. 



Rhizomes or stout stolons present. 



Panicle made up of several densely flowered racemes; stems decumbent and rooting at 



base, sending out stout stolons 9. P. barbinode. 



Panicle open; creeping rhizomes present. 



Fertile lemma smooth; culms mostly single 8. P. repens. 



Fertile lemma minutely transversely rugose; culms tufted 10. P. maximum. 



Rhizomes and stout stolons wanting. 



First glume as long as the spikelet or a little shorter, acuminate. 



Blades glabrous, flat, about 1 cm. wide 11. P. nephelophilum. 



Blades pubescent, flat or involute. 



Blades i to 1.5 cm. wide, velvety-pubescent, flat 12. P. kaalaense. 



Blades mostly less than 5 mm. wide, pilose hirsute, flat or involute. 



Spikelets about 2 mm. long; blades mostly flat, lax....i,^. P. xerophilum. 

 Spikelets about 3 mm. long; blades often involute, stiff.. 14. P. tenuifolium. 

 First glume short, in one sjiecies as much as half or two-thirds as long as the sjiikelei, 

 obtuse : ])lants forming low dense tussocks or mats in liogs. 



Blades conspicuously ciliate, broad, short, closely imbricate 15. P. isachnoides. 



Blades not ciliate. 



Spikelets 2 mm. long or a little less, the first glume less than half as long; 

 plants in close dense tufts, the blades short and spreading, closely 



imbricate 16. P. imbricatum. 



Spikelets more than 2 mm. long, the first glume short or as nnicli as two- 

 thirds the length of the s])ikelet : jilants less densely tufted and blades 

 as a rule not closely imbricate. 

 Spikelets al)oiit 3 mm. long; first glume short....!/. P. hillebrandianum. 

 Sjiikelets 2.2 to 2.5 mm. long; first glume short or long. 



First glume about one-fourth the length of the spikelet : fruit nearly 



as long as the second glume 18 P. forbesii. 



First glume half to two-thirds as long as the spikelet ; fruit nuali 

 shorter than the second glume 19. P. cynodon. 



I . Panicum fauriei sp. nov. 



Plants annual, bushy-branched: culms puberulent. branched at all the nodes, 10 to 15 cm. 

 tall; sheaths puberulent: ligule a densely ciliate membrane, the hairs nearly 1 mm. long; blades 

 flat or more or less involute, 2 to 5 cm. long, about i mm. wide, appressed-hispidulous beneath, 

 ajipressed villous on uiii)er surface: jianiclcs numerous, narrow, rather few-flowered. 1 to 3 cm. 



I84i 



