392 ORDER 155. GRAMINE^E. 



x Abortive fl. usually staminate. Spikelets obovate, 1 J" Nos. 19, 90 



x Abortive flower neutral, never with stamens. . . (y) 



y Plant stout, soft-downy, except the smooth noder No. 21 



y Plant smoothish, or rongh-hairy, branched or simple Nos. 22, 23 



Exotic, cultivated No. 24 



I P. cnplllikre L. Culm? thick at base, 1 2f; Ivs. broad-linear, and with the sheaths 

 bristly-hairy; panicle ample, pyramidal, capillary, loose; spkl. lance-ovate, acumi- 

 nate. J". purple. (T) Fields and waysides. Aug. 



9 P. aiituiniiaJe Bosc. Culm slender, 1020' ; Ivs. short, soon rolled, and with the 

 long sheaths glabrous ; pan. diffuse, bearded in the axils ; ped. long (2 4'), capillary ; 

 spkl. lance-oblong ; lower gl. minute. 111. to Car. 



3 P. proliferum Lam. Glabrous, 2 3f; Ivs. broad-lincm, en tumid sheaths ; pan. 



terminal and lateral, pyramidal, ped. sheathed ; spkl. elliptic, 1" ; lower gl. l / 4 or 

 '/j as long as the upper; B fl. pointed. Rich shady soils. Aug., Sept. 

 ft. e-rnirnlfittiin. Culm thick, geniculate below ; pan. dense. Marshes. 



4 P. Kymiiocarpiiin Ell. Culms 2 3f, stout, erect ; Ivs. lanceolate, 1' wide ; pan. 



largf. expanding; gpkl. lanceolate, 2", in clusters of 35; glumes and neutral pales 

 twice longer than the naked fertile fl. Banks, Ga., Fla., and W. 



5 P. Iilaiis Ell. Slender, glabrous, decumbent at base, 2f; lvi. narrow; pan. of slen 



der racemes; spkl. J", lower gl. | J as long ns the upper; both fls. coriaceous, di- 

 vergent or gaping at apex. Damp barrens, S. Aug. Oct. 



6 PJ ajrrostoides Mnhl. (a) Culm \\ 3f, compressed; Ivs. long, rough-edged; 



pan. term, and lateral, pyramidal, purplish, of dense racemes; spkl. (b) 1", lance 

 ovate; upper gl. 3-veined, t longer than the lower; neutral pales sub-equal. Jl. H 



7 P. ancep* MX. Culm and Ivs. as in No. 6. Pan. very large and open; spkl. 14", 



forked when ripe; upper gl. 5-veined. twice longer than the lower, shorter than the 

 lower neutral pale, which is twice longer than the other pales. N. J., and 8. Aug. + 



8 P. viliif orme Wood. Very glabrous ; pan. at each joint, and term, of loose ra- 



cemes ; spkl. lance-ovate ; up. gl. 9-veined, ty", lower neutral pale a little longer, the 

 other 3 pales a little shorter, lower gl. J as long. Meadows, E. Tenn. Aug. 



9 P. gibbum Ell. Culm 2 3f, assurgent; Ivs. broad-linear, glabrous; pan. 5 6', 



dense, spindle-form ; spkl. tumid, near 2" ; lower gl. very small, upper very large, 

 11-veined, gibbous at base; sterile fl. (S . Chapm.) neutral. Wet. S. Jl. Sept. 



10 P. ainttrum Ell. Culm terete, strict, 231; Ivs. rolled and rigid (bitter to taste) , 

 pan. 6 1(X, contracted, its smooth branches apprei-sed-erect ; spkl. lance-ovate; 

 glumes pointed, the lower 1", upper nearly 2" ; sterile fl. 1J", an th. orange. Sands. 



IIP. vlrgatiim L. Culm 3 5f, Ivs. flat ; pan. large, thin, at length diffuse, 1020' 

 long; spkl. scattered, ovate, pointed, purplish; upper gl. 2", sterile fl. 1J", fertile fl. 

 and lower gl. 1", all divergent when ripe ; autn. purple. N. Y.. S., and W. Aug. 

 ft. ofiiiiMini. Panicle contracted ; spikelets smaller, not pointed, obtusish. N. J. 



12 P. verrucosum Mnbl. Slender, weak, decumbent below, 1020'; Ivs. lance- 

 linear, short ; pan. few-flowered; spikelets obovate, bluish, |", beset with fine 

 warty (verrucou.?) points. (T) Thickets and swamps, not rare. Aug. 



13 P. rflloKiim Ell. Villous with soft white hairs throughout, 1020'; Ivs. flat, 

 short; pan. small (2 3' long), oblong, loose; spkl. oval, 1", green; upper gl. and 2 

 fls. equal, lower gl. line a$ 1. mg. Everg.'esn, damp. S. Apr., Ma/. 



14 P. ciliatlflorum Wood, fringed G. Erect, strict, 2 3f; Ivs. narrow, rigid, 

 flat, ciliate; pan. slender, strict, 3 4'; spkl. 1J", oblong, silky-villou? glume soli- 

 taiy, equaling the lower staminate pale, 5-veined, Barrens, S. Sept. 



ft. ri./w.'K. Lvs. glabri /us, erect; sterile fl. neutral, hairs purple. 



15 P. li. li<b torn urn L. Culm at first simple with one panicle, soon branched, 

 slender. 8 tJO' ; Ivs. lance-linear, short, \V by 2 4"; terminal pan. oval, small 

 (12'), stalked; spkl. few and gmall, J'', round-oval; lower gl. i fas long as the up- 

 per. Common in fields. June Sept. 



