graminacea:. 425 



the former wholly concealed in the leaves, exserted, or on a long peduncle. 

 Anthers and stigmas purple. Hidden-jlowered Panic-grass. 



7. P. laiifolium Linn. : culm mostly simple, bearded at the joints ; leaves 

 oblong-lanceolate, smooth, or with the sheaths somewhat pubescent ; pan- 

 icle terminal, a little exserted, simple, pubescent ; spikelets oblong-ovoid ^ 

 lower flower staminate, of 2 palese; upper palea somewhat herbaceous, 

 nearly as long as the lower, acute. 



Moist woods. Can. to Car. W. to 111. June, July, %.—Culm 1—2 feet high, 

 simple or a little branched. Leaves cordate and clasping at base. Panicle 

 2 inches long, with pubescent downy branches. Broad-leaved Panic-grass. 



8. P. scoparium Lam. : whole plant softly villous ; leaves lanceolate ; 

 panicle erect, compound, setaceous, much branched ; spikelets turgid, ovoid, 

 pubescent. 



Wood. N. J. to Car. 1\.—Czdm 2 feet high, mostly simple. Flowers larger 

 than in any of our species. Scarcely distinct from the preceding. 



Broom-like Panic-grass. 



9. P. iiervosum Muhl. : culm simple, with the nodes smooth ; leaves 

 broad-lanceolate, smooth, a little ciliate on the margin ; panicle much 

 branched, smooth, many-flowered ; spikes oblong ; lower flower staminate ; 

 upper palea somewhat herbaceous, shorter than the lower. 



Marshy grounds. N. J. to Car. July. %.—Culm 3 — 4 feet high. Panicle 

 4 — 5 inches long, decompound. Allied to P. latifolium, but is taller, and has 

 the joints smooth and the panicles decompound and smooth. 



Nerved Panic-grass. 



10. P. xanthophysum Gray: culm erect, simple or branching from the 

 base ; leaves lanceolate, strongly nerved, cihate at the base ; sheaths hairy ; 

 panicle nearly simple, few-flowered, the branches erect ; spikelets globose- 

 obovate, pubescent : lower flower staminate, of 2 palese, as long as the 

 obovate perfect flower. 



Dry pine plains. Oneida, Hamilton, and Madison counties, N. Y. July. %. 

 — Cxdm 12 — 15 inches high, slender, smooth. Leaves very acute. Panicle 

 on a long naked slender peduncle. Whole plant yellowish when dry. 



Yellow Panic- grass. 



11. P.macrocarpon Torr.r culm erect, simple ; leaves linear-lanceolate, 

 erect, a little hairy beneath ; joints naked ; sheaths hispid ; panicle rather 

 compound, smooth ; spikelets globose-ovoid ; abortive flower neutral. 



Banks of streams. Mass. and N. J. July. %. — Culm 3 feet high, erect. 

 Panicle with few spreading flexuous branches. Large-fruited Panic-grass. 



1 2. P, p^tbescens Linn. : erect, much branched, leafy, softly pubescent ; 

 leaves lanceolate, ciliate ; panicle small, few-flowered, free ; spikelets sub- 

 globose-ovoid, pubescent. 



Shady woods. Penn. to Car. July. %. — Culm 18 inches high. Leaves and 

 nodes hairy. Panicle with horizontal branches. Hairy Panic-grass. 



** Spikelets in somewhat racemose panicles. 



13. P. agrostoides Muhl.: culm erect, compressed, smooth; leaves very 

 long ; panicles terminal and lateral, pyramidal, spreading ; the spikelets 

 ovoid-oblong, acute, appressed, and somewhat racemose ; lower flower 

 neutral, with 2 nearly equal paleae. P, elongatum Pursh. 



