tRj Memoirs Pcniicc P. Bisliof' }[iisciiin 



lating a third glume, bearing in its axil a nienibranaceous or hyaline palea and sometimes a 

 staminate flower, the palea rarely wanting; fertile lemma chartaceoiis-inilurate, typically obtuse, 

 the nerves obsolete, the margins 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 

 germination. .Vniuial or perennial grasses, of various habit. 

 Plants annual. 



Spikelets glabrous i. P. fauriei. 



Spikelets pubescent. 



Spikelets densely long-villous. 



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



Culms and leaves densely soft-villous 3. P. torridiun. 



Spikelets s]iarselv short-villons or densely long-villous only at the tip. 

 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 3. P. kauaiense. 



Culms and leaves villous or hispid. 



Leaves papillose-hispid; spikelets acuminate, 2.5 mm. long d. P. pellitum. 



Leaves denselv short-villous ; spikelets acutish, 1.5 mm. long 7. P. lanaiense. 

 Plants 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 sjiikelet or a little shorter, acuminate. 



Blades glabrous, flat, about i 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 atout 2 mm. long; blades mostly flat, lax....i,vP. xerophilum. 

 Spikelets about 3 mm. long; blades often involute, stiff.. 1 4. P, tenuifolium. 

 First glume short, in one species as much as half or two-thirds as long as the spikelet, 

 obtuse ; plants forming low dense tussocks or mats in lx:)gs. 



Blades conspicuously ciliate, broad, short, closely imbricate 13. 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 lilades short and spreading, closely 



imbricate 16. P. imbricatum. 



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

 thirds the length of the sjiikelet ; plants less denselv tufted and blades 

 as a rule not closely imbricate. 

 Spikelets alxnit 3 mm. long; first glume short.... 17. P. hillebrandianum. 

 Spikelets 2.2 to 2.3 mm. long ; first glume short or long. 



First glume alxiut one-fourth the length of the spikelet ; fruit nearl\- 



as long as the second glume 18 P. forbesii. 



First glume half to two-thirds as long as the s])ikelet ; fruit nnicli 

 shorter tli;in the second '^lume ig. P. cynodon. 



T . 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 i mm. long; blades 

 flat or more or less involute, 2 to 5 cm. long, about 1 mm. wide, appressed-hispidulous beneath, 

 appressed villous on ujjper surface; panicles numerous, narrow, rather few-flowered, i to 3 cm. 



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