GRAMINE./E. (GRASS FAMILY ) 679 



* Calm-leaves broadly lanceolate or wider, with 9-15 principal nerves. 



11. P. latifolilim, L. (excl. syn. Sloane, &c.) Culm (l-2 high), 

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

 smooth sheaths often bearded with soft woolly hairs ; leaves broadly oblong-lanceolate 

 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, \^" 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. Waited, Poir.) Moist thick- 

 ets ; common. June - Aug. 



12. P. eland estlilU in, L. Culm rigid (l-3 high), very leafy to the 

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

 papillae, bearing very stiff and spreading bristly hairs ; leaves 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. pEDUNCUiA- 

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



otherwise resembling No. 1 1 ; but the spikelets more ovoid, often smooth ; the 

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

 mon. July - Sept. 



13. P. microcarpon, 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, very 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 srnoothish ; lower glume orbicular and very small. 1J. (P. multiflorum, Ett. 1 

 not of Poir.) Dry or moist thickets, Pennsylvania and Michigan to Illinois, 

 and southward. July -Sept. 



14. P. xailtliopliysilin, Gray. Culm simple, or at length branched 

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

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

 margins, strongly 9- 1 1 -nerved ; panicle long-pedunclcd, simple, contracted, the ap- 

 pressed branches bearing few roundish-obovate spikelets (about l" lony) ; lower 

 glume ovate, acutish, one third or half the length of the 9-ntrved upper one. 1J. 

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

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

 staminate. 



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

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

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

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

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

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

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



16. P. paiicifloruin, Ell.? Culms upright, at length much branched 

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

 rather faintly 3-ncrved, hairy or s mooth, fringed on the whole margin or next the 



