648 GKAMINK^. (grass FAMILY.) 



minal panicle more or less encJosfd in the sheaths, or with the terminal one at length 

 long-pcdiirclcd (P. pedimciilatnm, Torr.) : — otherwise resemblin<,' No. 11 ; l>ut 

 the sinkdfts more oroid, often smooth ; the lower flower (always ?) neutral. — Low 

 thitkets ami river-hanks: common. June - Se])t. 



13. P. microearpon, Muhl. Culm and sheaths as in No. 11 ; the hroadly 

 lanceolate leaves nearly similar, hut lonf^er in proportion and less pointed, not 

 dilated at the rounded hristly-eiliate base, very roufj^h-margined, the u])per sur- 

 face rou<;hish ; panicle soon exserted on a slender peduncle, very many-flowered, 

 narrowly ohlonj^ (3' -7' lonjj) ; spikclets only ahout ^" long, ovoid, smooth or 

 smoothish ; lower glume orbicular and very small. (P. multiflorum. Ell. ? not 

 of P<iir.) — Dry or moist thickets, Pennsylvania and Michigan to Illinois, and 

 southward. July -Sept. 



14. P. xanthophysum, Gray. Culmsimple, or at length branched near 

 the base (9' -15' high) ; ahcaths hairij ; leaves lanceolate, ueri/ acute (4' -C long by 

 ^' wide), 7int dilated at the ciliate-hearded claspinej base, smooth except the margins, 

 stromjlji 9-\l-nerred: panicle lonej-ped uncled, rej-ij simple, the appressed branches 

 hearing a few ronndish-olmmte spilcelets (about Ij" long); lower glume ovate, 

 acutish, one tl)ird or half the length of the 9-ncrved upper one. — Dry sandy 

 soil, Maine to Wisconsin, and northward : rare. June. — Plant yellowish-green : 

 spikelets minutely doAvny : sterile flower sometimes staminate. 



\^. P. viscidum, Ell. Culms upright or ascending, at length much 

 branched, leafy to the top, denseli/ velvet y-downy all over, as also the sheaths, Avith 

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

 likewise velvety, lanceolate (|' wide), 1 1 - 13-nervcd; panicle spreading, the lat- 

 eral ones included; spikelets ohovate 1 " or 1 j" /on^, downj- ; the roundish lower 

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

 New Jersey to Virginia, and southward. Aug. 



16. P. paueifldrum, Ell.l Cm/7«s upright, at length much branched and 

 reclining (\°-2°\on^),rou(]hish; leaves lanceolate (^' -h' long by ^'-i'widc), 

 rather faintly 9-nerved, hairy or smooth, frinr/ed on the whole margin or next tlie 

 hase with long and stiff spreading hairs, the sheaths bristly throughout with similar 

 hairs ; panicle open, nearly simple, bearing few tumid-obovatc hairy or smoothish 

 spikelets about 1^" long ; lower glume roundish, ahout half or a quarter of the 

 length of the upper one. — Wet meadows and copses, E. Massachusetts to Wis- 

 consin, and southward. June, July. — Distinguished by its much larger spike- 

 lets, more nerved leaves, and coarser aspect, from any form of the next. It has 

 probably been described under several names, some of them earlier than Elliott's. 



++ ++ J^enves linear or lavceolnle, with few or indistinct jirimary nrrres. 



17. P. dich6tOinum, L. ! Culms (8'- 20' high) at iirst mostly simple, 

 hearing a more or less exserted spreading compound panicle (I' -3' long), and 

 lanceolate flat leaves (those tufted at the root usually ovate-lanceolate and very 

 short, thickish) ; hut commonly branching later in the season, the branches often 

 clustered, and hearing nearly simple and included small panicles ; spikelets ^'' to 

 about 1" long; oblong-obovate, downy or smooth; lower glume roundish, one third 

 or a quarter th^ length of the 5 - 1 -nerved upper one. — Founded on an autumnal 

 state of the species, much forked and with densely clustered lateral branchlets 



