584 GRAMINK.K. ((JRASS FAMILY.) 



••- ••- Cuhiis branching : panicle ample, its Imne or jiednncle included in Ifn vjiper 

 slieal/i : spikelels loiiij-pedictlled. 

 22. P. autumnale, Bosc. reremiial, nearly Rliilnnns ; (uliiis Jisfcmling, 

 1° liigli ; leaves liiii'iir, 2'-."i' lung, scahruus siiwve ; spikelcts spincllc sliaped, 

 tlicir iietlicels 2'-3' long ; ujiper glumes longer than the acute lloret, the hnver 

 niiniitc — Dry sandy soil, nut coiunKjn. 



2'!. P. capillare, L. Annual, hirsute; cnims erect or decunilpent, 1"- 

 2° long; leaves broadly or narrowly linear ; spikelets lanceolate or elliptical, 

 2" or less loug ; ujjjjer glumes twice as long as the lower, and longer than the 

 obtuse Horet. — Dry soil, common. , 



■•--»--»- Culms herbaceous, at Jirsl generulli/ simple, but later bearing mure or less 

 clustered few- flowered branches from the loiver joints : leaves mostly short 

 andjlat: panicle loose or spreading, I'-G' long. 

 ■>-*■ Spifcelets 1" or more long : sterile fower neutral (except thejirst). 



24. P. latifolium, L. Culms smooth, erect ; leaves ovate-lauceolate, 

 mostly smooth, the sheaths, especially at the joints, villous ; panicle nearly 

 simple; spikelets large (2" long), ohovate; glumes puliescent, olttuse, the 

 upper 2-3 times longer than the lower one; sterile flower 3-androus. — Dry 

 rich soil, common. May. — Culms 1°- 1^° high. Leaves and panicles 3' -4' 

 loug, the latter cxserted. 



25. P. clandestinum, L. Culms rigid (1°- 2° high), l)ranched, naked 

 at the joints; leaves lanceolate, acumiuate, the sheaths papillose-hirsute; pan- 

 icles small, lateral and terminal, more or less included in the sheaths; sjiike- 

 lets oblong, smooth or pubescent (l.J" long); lower glume rarely half the 

 length of the 7-uerved upper one. — Dry sterile soil in the upper districts. 

 Sept. %. 



Var. pedunculatum, Gray? Taller (2° -4° high); leaves 4'- 10' 

 long, the sluaths smooth or merely pube.scent ; termiual panicle 4'-5' loug, 

 diffuse, long-])e(iuncled. — Kiver banks, Florida. 



26. P. Joorii, Vasey. Culm 8'- 12' high, dichotomously liranched. very 

 leafy; leaves lanceolate, 3' -4' long ; panicles shorter than the leaves, few- 

 flowered ; spikelets oblong, pubescent, l"long; upper glumes as loug as the 

 acute floret, the lower minute. — Mississippi, and \ve.stward. 



27. P. commutatum, Scliultes. Smooth or pubescent; culms l°-2° 

 high ; leaves bro.idly or narrowly lanceolate, 2'-5' long; panicle lungpeilun- 

 cled, 2'-f/ long, diffuse; s])ikelets oblong, rather acute, 1"-1^" long; u])]ier 

 glumes equalling the acute floret, thrice as long as the lower oue. (T. ner- 

 vosum, Elliott.) — Dry open woods, common. 



28. P. SCOparium, Muhl., Lam. ? Hairy or woolly all over, except the 

 upper surface of the somewhat rigid lanceolate leaves; culms stout (l°-li° 

 high), mostly simple ; panicle terminal, e.xserted ; spikelets obovate (H" long), 

 obtuse, pubescent ; upper glume 9-nerved, three times the length of the lower 

 one ; sterile flower neutral. — Open woods and margins of fields, in dry soil 

 May. 



29. P. paueiflorum, F-ll- Culms scabrous, soon branching, 1°- 14^° high ; 

 leaves liuear-lauceolate, 2' -3' long, the sheaths hirsute, bearded at the throat; 



