PANICUM. CLXI. GRAMINE^E. 605 



at throat ; panicles large, pyramidal, terminal and axillary, smooth ; spikelets 

 racemose ; abortive flower with one palea. 7J. 1 Wet meadows, Mid. and S. 

 States. Sept. 



4. P. PEDUNCULATUM. ToiT. 



St. dichotomously branched above, round, 3 4f high; Ivs. f'-wide, taper- 

 ing to the point ; sheaths hispid and papillose ; panicle compound, smooth, on a 

 long peduncle, branches in pairs, racemed ; spikelets ovate, smooth ; upper palea 

 of the abortive flower half as long as the lower. 2J. Moist woods, N. Y. Jl. 



5. P. RECTUM. Roem. & Schultz. (P. involutum. Torr. P. depaupera- 

 tum. Muhl.) St. csespitose, mostly simple, hairy at the joints, erect, 10 15' 



high ; Ivs. lance-linear, erect, involute at the end, forming a long, slender, pun- 

 gent point, rather rough and hairy, sometimes smooth, upper ones longer than 

 the lower; sheaths scabrous, hairy; panicle erect, rather few-flowered, the 

 branches tortuous, in pairs, one longer with 2 spikelets ; spikelets rather large, 

 pedunculate ; glumes veined, lower one short, broad-ovate, obtuse ; palece hard, 

 whitish, shining. N. Eng. ? and Mid. States ! May, June. 



6. P. XANTHOPHYSUM. Gray. 



St. 12 15' high, glabrous, generally simple ; Ivs. lanceolate, 3 6' by 

 5 7", acute, veined, nearly smooth, ciliate at base; sheaths pilose, shorter than 

 the joints; ped. elongated; panicles simple, few-flowered; spikelets obovate ; 

 glumes pubescent, the inferior one acute, 3-veined, half the length of the many- 

 veined, superior one ; $ 2-valved, cartilaginous, obtuse, smooth and shining, 

 about equal to the superior glume. Near Oneida Lake, Kneiskern, Conn. 

 River, N. H. ! to Conn. ! June, July. 



* * Spikelets in loose panicles. 



7. P. CLANDEST1NUM. 



St. with short, axillary, appressed branches, 2 3f high, rigid, leafy ; Ivs. 

 3 6' by 1', lanceolate, subcordate at base ; sheaths hispid, enclosing the short, 

 lateral panicles ; upper palea of the neutral flower obtuse. Tj. Moist woods, 

 Mass, and Mid. States. July, Aug. 



8. P. LATIFOLIUM. (P. scoparium. Lam. ?) 



St. nearly simple, with the nodes retrorsely pilose; Ivs. lance-ovate, clasp- 

 ing, somewhat pubescent ; panicle terminal," a little exserted from the sheath, 

 simple, pubescent ; spikelets rather large, oblong-ovate ; abortive flower stami- 

 nate. 7J. Common in ditches, woods, &e., U. S. Readily known by broad, 

 short leaves. June, July. 



9. P. NERVOSUM. Muhl. 



St. simple, smooth at the nodes, 3 4f high ; Ivs. oblong-lanceolate, 2 3' 

 long, smooth, a little ciliate on the margin, cordate at base, an inch wide, with 

 short sheaths ; panicle much branched, smooth, many-flowered, pedunculate or 

 sessile, branches flexuous, somewhat spreading ; spikelets oblong; abortive flower 

 staminate. Bogs, N. Y. to Car. W. to 111. Perhaps not distinct from the last. 

 July. 



10. P. MACROCARPON. Torr. 



St. erect, simple, straight, 2 3f high ; Ivs. linear-lanceolate, erect, sub- 

 pilose beneath, 3 6' long; sheaths hispid, villous on the margin, with no 

 stipules ; panicle rather compound, smooth, with few, spreading, flexuous, sub- 

 simple branches ; spikelets ovoid-globose ; abortive flower neutral. Banks of 

 Connecticut river, Mass. July. 



11. P. PUBESCENS. Lam. (P. nitidum, 0. villosum. Gray.') 



St. 8 30' high, simple or branched, erect, and with the sheaths, covered 

 with a dense, villous, deflexed pubescence ; sheaths bearded at the throat ; Ivs. 

 remote, linear-lanceolate, short, upper ones pubescent, lower villose ; panicle 

 terminal, rather crowded, compound, sometimes rather loose, branches subver- 

 ticillate, pubescent ; spikelets pubescent, rather small, at the extremity of the 

 branches; lower glume small, upper one 5-veined; abortive flower neutral, < 

 longer than the upper glume, smooth. Penn Yan, N. Y., Sartwell, Penn. to 

 Ohio, Suttivani! June. 



