GEAMINE^. (grass FAMILT.) 579 



•"• Culm-leaves broadly lanceolate or wider, with 9-15 principal nerves. 



11. P. latifolium, L. (excl. syn. Sloaue, &c.) Culm (l°-20 high), 

 imooth ; the joints and the orifice of the throat or margins of the otherwise 

 smooth sheaths often bearded with soft woolly hairs ; leaves broadly <Mong4ancedate 

 from a heart-clasping base (often 1' wide), taper-pointed, 11 - 15-nerved, smooth, 

 or sparingly downy-hairy; panicle more or less exserted (2' -3' long), usually 

 long-peduncled, the branches spreading; spikelets obovate, Ij" long, downy ^ low- 

 er glume ovate, not half the length of the many-nerved upper one ; sterile flower 

 often (but not always) with 3 stamens. 1). (P. Walteri, Poir.) — Moist thick- 

 ets ; common. June - Aug. 



12. P. clandestlnum, L. Culm rigid (1°- 3° high), very leafy to the 

 top, at length producing appressed branches, the joints naked; sheaths rough with 

 papillce bearing very stiff and spreading bristly hairs ; loaves oblong-lanceolate 

 from a heart-clasping base, very taper-pointed ; lateral panicles and usually also 

 the terminal panicle more or less enclosed in the sheaths, or, in var. PEDUNCnLi- 

 TUM (P. pedunculatum, Ton-.), with the terminal one at length long-peduncled: 



— otherwise resembling No. 11 ; but tlie spikelets more ovoid, often smooth; the 

 lower flower (always ■?) neutral. — Low thickets and river-banks ; rather com- 

 mon. July - Sept. 



13. P. microcdrpon, Muhl. Culm and sheaths as in No. 11 ; the 



broadly lanceolate leaves nearly similar, but longer in proportion and less point- 

 ed, not dilated at the rounded bristly-ciliate base, veiy rough-margined, the up- 

 per surface roughish ; panicle soon exserted on a slender peduncle, very many- 

 flowered, narrowly oblong (3' - 7' long) ; spikelets about |" long, ovoid, smooth 

 or smoothish ; lower glume orbicular and very small. 1|. (P. multiflonim, EU. 1 

 notofPoj'r.) — Dry or moist thickets, Pennsylvania and Michigan to Illinois, 

 and southward. July -Sept. 



14. P. xanthoph:^Slim, Gray. Culm simple, or at length branched 

 near the base (9'-15' high); sheaths hairy; leaves lanceolate, very acute (4'-6' 

 long by J' wide), not dilated at the ciliate-bearded clasping base, smooth except the' 

 margins, strongly 9-11-nerved; panicle long-peduncled, simple, contracted, the ap- 

 pressed branches bearing few roundish-obovate spikelets (about I^" long) ; lower 

 glume ovate, acntish, one third or half the length of the 9-nerved upper one. H 



— Dry and sandy soil, Maine to Wisconsin, and northward ; rare. June. — 

 Plant yellowish-green : spikelets minutely downy : sterile flower sometimes 

 Etaminate. 



15. P. viscidum, Ell. Culms upright or ascending, at length much 

 branched, leafy to the top, densely velvety-downy all over, as also the sheaths, with 

 reflexed soft and often clammy hairs, except a ring below each joint ; leaves likewise 

 velvety all over, lanceolate (J' vnde), 11 - 13-nerved; panicles spreading, the lateral 

 ones included; spikelets obovate, 1" or 1^" long, downy; the roundish lower 

 glume scarcely one fourth the length of the 7-uerved upper one. — Damp soil, 

 S. New Jersey to Virginia, and southward. Aug. 



16. P. paiiciflorum, Ell. 1 Culms upright, at length much branched 

 and reclining (\°- 2° long), roughish; leaves lanceolate (3' -5' long by J' -J' wide), 

 rathe?- faintly 9-nerved, haiiy or smooth, fiinged on the whole margin or next the 



