ORDER 155. GRAMINE^E. 393 



0. nttidum. Smooth, shining; Ivs. narrow; ped. long; spkl. ovaL 



y. sphatrocarpum. Hairy; peduncle long; spkl. rounded, dark-purple. 



a. barfmliitum. Taller; nodes with a ring of deflexed hairs. 



e. lanug-inbtum. Woolly; Ivs. larger; spikelets green; pan. larger. 

 . gpathuceum. Hairy and leafy to the top ; panicles sessile. 



16 P, dcpauperatum Muhl. Culm simple, strict, tufted, 612'; Ivs. linear 

 erect, the upper elongated; pan. simple, sessile or becoming long-stalked; spkl. 

 oval, f 1"; lower gl. $ a~s long as the upper 7-veined one. Hills and woods, com- 

 mon. June. Varies with Ivs. hairy or smoothish, and 

 0. fnralittuni) with Ivs. involute, ending in a long stiff point. 



1 7 P. pan cifloru m Ell. (c) Culm assurgent, 1 2f; Ivs. lanceolate, 35' by 57" 

 hirsute below as well as the sheaths, family 9-veined; pan. open ; spkl. (d, e) few, 

 large (1 1J-"), oval ; lower gl. | as long as the upper, (ar, neutral fl.) Damp shades. 



18 P. pubescens Lam. Culm slender, branched, 2 3f; Ivs. lance-linear, 3 6' by 

 3 5", 9-veined, retrorsely hirsute as well as the open sheaths ; spkl. oval, 1J", pubes. 

 cenr, outer glume lanceolate, 1", inner 9-veined. Dry fields. June. 



19 P. latifolitim L. Erect, 1 2f; Ivs. lanceolate, dilated and cordate-clasping at 

 base, 35' by 1', smoothish, 11-13-veined ; pan. exsertecl, 3' long; spkl. obovate, 

 H" ; lower gl.^ovate, |", upper gl. 9-veined; neutral pales sub-equal, usually with 8 

 stamens. In moist shady places : common. June, July. 



20 P. xaiithopliysum Gr. Culm simple or branched below, 915'; Ivs. lance- 

 olate. 30' by 57", not dilated at the ciliate clasping base ; pan. long-stalked, 

 racemu-like; spkl. few, round-obovate, li"; lower gl. ovate, } as long as the upper 

 9-nerved one; sterile fl. often $. Dry. N. Eng. to Wis. June. 



21 P. viseidum Ell. Hoary with a dense viscid pubescence, 2-4f, stout; joints 

 with a smooth brown ring; Ivs. lance-linear, 3 6' by 6 1<>" ; pan. 46', loose; spkl. 

 pale, oval, 1" ; lower gl. and upper pale minute. Wet. N. J., and S. Aug. 



22 P. claudestinum L. Culm rigid, leafy, 2 3f ; Ivs. 3 ' by 1'. dilated and cor- 

 date at base ; sheaths scabrous or rough-hairy, enclosing the lateral and often the 

 terminal dense panicle ; spkl. elliptical, 1J". Moist woods. July, Aug. 



23 P. microcarpoii Muhl. Erect, simple, glabrous; Ivs. lanceolate, broad and 

 clasping at base, veiny, 610" wide ; pan. long-stalked, diffuse ; spkl. small (1), oval, 

 numerous, purple ; lower gl. minute. Pa., W., and S. July Sept. 



24 P. MILIACEUM. Millet. Lvs. lance-linear and sheaths hairy ; pan. large, open, nod- 

 ding; spkl. ovate, solitary; glumes pointed, sub-equal. Turkey. 



21. PENICILLARIA SPICATA. Erect, 4f, branching, with broad, 

 flat leaves. Panicle cylindric-oblong. If in length, compact, consisting of innumerable 

 simple branches, each with 2 or 1 spikelets at the end, and clothed with spreading hairs. 

 Each spikelet bears at length a white ripened grain. (T) E. India. 



22. OPLISMENUS, Beauv. COCK-SPUR G. 

 Spikelets in dense, spike-like, panicled racemes. 

 Glumes and lower pale of the sterile fl. rough- 

 pointed or awned. Otherwise as in Panicum. 



I O. crus-gallt L. (a) Culm terete, 3 4f ; Ivs. lance- 

 linear, rough-edged, ligule none; pan. with its spike- 

 foi-m branches alternate or in pairs ; rachis rough-hairy ; 

 glumes bristly, scarcely awned; awn of the pale (b) 

 G 18" long, very rough. Sheaths generally smooth. 

 Waste grounds : com. Aug., Sept, [ mere]y pointed. 

 ft. tniitlcuK. (c) Awns very short, or the hispid pale 



f. /ii*piiut<. Sheaths very bristly; awns very long. A very coarse variety. 



