TRIANDRIA.— DIGYNIA. 67 



pound ; rachis 5-angled ; glumes terminating in his- 

 pid bristles ; sheaths glabrous. 

 HAB. Along ditches, and in cultivated grounds. Aug- 

 — Sept. ©• Culm 2 — 4 ft. high ; leav. broad and 

 flat ; pan. dense ; bristles sometimes wanting. 



2. P. hispidum : panicle compound r nodding;, racemes 



alternate ; glumes terminating in hispid bristles 

 sheaths hispid. 

 HAB. Salt-marshes. Sept.— Oct. Q. Culm 3—4 ft. 

 high, thick ; fl. always with bristles. 



3, P. clandestinum : culm with short axillary branches ; 



leaves broad-lanceolate, cordate at the base ; sheathe 

 hispid, enclosing the short panicles ; abortive floret 

 neuter, 2-valved ; superior valve obtuse. 



HAB. Shady moist places. July — Aug. H . Culm 

 2 — 3 ft. high, erect and rigid ; leaves 1 in. broad ; 

 pan. term, and lat. 

 I. P. pedunculatum : culm dichotomous ; leaves broad- 

 lanceolate, slightly hairy above, attenuate ; sheaths 

 hispid and papillose ; panicle long-pedunculate, com 

 pound, smooth ; spikelets ovate, smooth ; abortive 

 tloret 2-valved ; superior valve half the length oi 

 the inferior. 



HAB. Moist places in woods. July, U . Culm 3 — 4 

 ft. high, much branched above ; leav. very acute ; pan . 

 terminal. 

 '). P. latifolium : culm mostly simple, bearded at tin 

 joints ; leaves oblong-lanceolate, smooth, or with 

 the sheaths, somewhat pubescent ; panicle terminal, 

 a little exsert, simple, pubescent ; spikelets oblong- 

 ovate ; abortive floret antheriferous, 2-valved ; su- 

 perior valve subherbaceous, nearly as long as tin 

 inferior, acute. 



HAB. Woods and shady thickets. June — July. If. 

 Culm 1 ft. high / leav. 1 in. broad; pan. about \b-fl 

 downy, 

 y. P. scoparium: whole plant softly villous ; leaves lan- 

 ceolate ; panicle erect, compound, setaceous, much 

 branched ; spikelets turgid, ovate, pubescent. 



HAB. New-Jersey. H. Culm 2 ft. high, mostly sim 

 pie ; leav. somewhat waved ; fl. largest of our species. 

 7. P. nervosum : culm simple ; nodes smooth ; leave* 

 broad-lanceolate, smooth, a little ciliate on the mar- 



