Oedbr 156.— GEAMIIIEjE. tST 



1 J" long, green ; lower glume ovate, not half as long aa the upper ; abortive 

 pales subequal, usually with 3 stamens. — In moist, shady places, U. S. and Can. 

 Jn., Jl. (P. SGoparium and nervosum Lam. P. cUiatum Ell., etc.) 



20 P. xanthopll^Biira Gray. Culm generally simple, glabrous, 9 to 15' high; 

 Ivs. lanceolate, 3 to 6' by 5 to 1", not dilated at Oie ciliate, clasping base, smooth, 

 9 to 1 1-veined ; pan. hng-exserled, simple, raceme-like, few-flowered ; spkl. round- 

 ish-obovate 1|" long ; lower glume ovate, 3-veined, acutish, J as long as the up- 

 per many-veined one ; abortive pales oftener with 3 stamens. — Dry soils, N. Eng. 

 to Wig. (Lapham). Earo. Jn. 



21 P. visoidum Ell. Hoary, with a dense, short, soft, viscid pubescence ; culm 

 decumbent, assurgent 2 to 4f, stout; joints a smooth brown ring; Ivs. lance- 

 linear, 3 to G' by 6 to 16'' ; sheaths much shorter than the internodes ; pan. rather 

 large (4 to 6' long); loose ; spkl. light green, 1" long, oval, acutish, lower glume 

 very small, upper palo very small, truncate. — U Damp places, N. J. to Ga. (Feay). 



22 P. clandestinu'm L. Culm with short, axillary, appressed branches, 2 to 3f 

 high, rigid, leafy; Ivs. 3 to 6' by 1', lanceolate, subcordato at base; sheaths his- 

 pid with papillEB in the grooves bearing bristly hairs, and enclosing the short 

 lateral panicles ; spkl. elliptical, acutish, 1-J-" long, striate, often purple ; upper 

 pale of the neutral fl. obtuse. — it Moist woods, Mass. and Mid. States. Jl., Aug. 



23 P. microodrpon Muhl., Darl. Culm 18 to 30' high, erect, simple, glabrous; 

 joints glabrous ; Ivs. lanceolate, veined, ciliate at base, undulate and scabrous on 

 the margin, scabrous above, smooth beneath, G to 10" wide; sheaths deeply 

 striate, smooth; slip. 0; pan. much branched, nearly smooth; spkl. small, (-J" 

 long), roundislirobovate, purple, numerous, scarcely pubescent ; upper sterile pale 

 minuto; fr. shining, bluish white. — If. 



24 P. ^Walteri Ell. Culm slender, glabrous, erect, 2f ; Ivs. linear 3 to 6' by 2 to 

 3", glabrous as well as the open sheaths ; spikes thick, dense, 1-sided, alternate 

 (the 2 lower sometimes opposite), 6 to 12" long; spkl. imbricated in 3 rows, 

 broad-ovato ; glumes minutely hispid, tho lower half as large, upper 3-veined ; 

 abortive pales unequal, staminate ; fertile fl. roundish. — Damp grounds, Can. to 

 Fla. and La. Jn. — Aug. (Nearly allied to Oplismenus.) 



25 P. Aurelianiun Hale (MS.). Culm decumbent, geniculate, slender, branched, 

 glabrous; Ivs. lanceolate, glabrous, 1 to 2' by 3 to 4", sheaths ciliate; spikes 

 slender, 6 to 12" long, alternate, 1-sided; spkl. ovate, acute; lower glume -J as 

 long' as the upper, smooth and 5-veined one ; abortive pales equal, slaminato ; 

 fertile fl. ovate. — Damp soils, about N. Orleans (Hale). 



26 P. miliaceum L. Millet. Lvs. lance-Hnear and sheaths hairy; culm 

 2 to 3f high ; pan. large, open, nodding; spkl. solitary, ovate ; gls. acuminate- 

 muoronate, subequal ; pales obtuse. — Cultivated. \ Turkey. 



27 P. Jumentorum Pers. Another cultivated i?pecies, from N. Africa. 

 Much valued South. It is tall, stout, smooth. Tho spiltelets are singularly 

 arranged in 2s or 33, one or two sterile to each fertile. Seeds black. 



19. OPLIS'MENUS Beauv. Cock-spur Gkass. (Gr. onXLana, ar- 

 mament, iJ.svog, courage ; alluding to the stout awns.) Spikelots, &c. 

 as in Panicum, except that the lower abortive pale (and often the 

 glumes) is prolonged more or less into an awn. — Coarse grasses with 

 the fls. in dense paniculate racemes. 



1 O. Cru3-gdlU Kunth. Baen-tabd Grass. Terete, smooth, 3 — if high; Iva. 

 linear-lanceolate, fiat, serrulate, with smooth, striate sheaths and no stipule ; patL 

 simple or apparently so, branches spike-form, compound, alternate and in pairs; 

 rachis hairy and rough ; glumes scarcely awned, hispid-bristly ; lower abortive 

 palea ending in a rough awn, 6" to 18'' long; fertile fl. ovate. — (D Acoarse, weedy 

 grass, introduced into cultivated grounds, bai'n-yards, Ac, common.' Aug., Sept 

 § Variable. (Panicum, L.) 



/3. MUTICUS. Awns very short, or the pale merely subulate-pointed. Common. 

 y. HISPIDUS. Sheaths very bristly ; awns very long. 



2 O. Iiirt^llus E. & S. Culm glabrous, decumbent, branched; Irs. lanceolate, 

 flat, 1 to 2' by 2 to 4", with scattered, appressed hairs on the upper surface; 



