576 GRAMINEE. (GRASS FAMILY.) 
coast, Florida, and northward. May.—Culms 3°~4° high, soon much branched. 
Leaves 6!-10! long. Branches of the panicle smooth. — In the smooth form of 
this species I notice a remarkable deviation from the generic character. The 
two glumes and lower palea of the sterile flower are as usual in the genus, while 
the upper palea of the latter is developed into an apparently perfect flower, in 
all respects similar to the upper one. 
23. P. scabriusculum, Ell. Culm (3°-4° long), sheaths, and lower 
surface of the linear-lanceolate leaves rough and more or less pubescent ; panicle 
ample, compound, diffuse, pubescent below, the divisions smooth; spikelets 
small, ovate, rough, but not pubescent ; upper glume 9-nerved, the lower minute. 
— Pine-barren swamps, Florida to North Carolina. May. — Probably a form of 
the last. 
24. P. microcarpon, Mull. Culm and leaves smooth ; the latter lance- 
olate, tapering from a broad cordate base, strongly nerved, fringed on the mar- 
gins near the base; panicle compound, diffuse ; spikelets very numerous, small 
($" long), oval, pubescent; upper glume 5-nerved, 3 times the length of the mi- 
nute lower one, (P. multiflorum, Æl., not of Poir. P. ovale, Ell. ?) — Dry soil, 
South Carolina, and northward. May. — Culms 2° -219 high. Leaves 4/-6! 
long, 8” - 10" wide. 
25. P. dichotomum, L. Culms at length much branched; panicle 
nearly simple, few-flowered ; leaves linear-lanceolate, bearded at the base, or vil- 
lous all over. (P. villosum, Ell.) — Var. 1. Panicles compound, diffuse ; 
spikelets small; leaves linear-lanceolate, and, like culm, sheaths, and panicle, 
soft hairy (P. lanuginosum, Ell.), or only at the joints of the culm (P. barbula- 
tum, Michr.), or smooth throughout (P. nitidum, £L, spikelets purple and 
very minute). — Var. 2. Culms weak; panicle loose, compound ; sheaths and 
pale-green thin leaves soft hairy (P. pubescens, Ell), or the margins of the 
otherwise smooth leaves fringed with long hairs (P. ciliatum, Ell.).— Var. 3. 
Culms (2° high) smooth ; leaves large (6/ — 8' long), lanceolate, rough or downy - 
above, margins near the base and sheaths fringed ; panicle large, diffuse ; spike- 
lets (1" long) oblong, nearly smooth. (P. nervosum, Ell.?) — Var.?4. Culms 
smooth and rigid (19 — 139 high) ; leaves pale, rigid, lanceolate, fringed ; panicle 
oblong, diffuse; spikelets minute, oval, very hairy. (P. sphzerocarpon, Ell.) — 
Woods, fields, and swamps, everywhere, in some one of its numerous forms. 
March - May. n : 
