102 Rhodora [May 
secondary branches appressed, generally bearing 1 to 3 spikelets. 
Spikelets 2.5 mm. long, very acute or acuminate; first glume acute, 
one-half as long as the spikelet, 3-nerved, scabrous on the keel at 
the apex; second and third glumes equal, 5-nerved, acuminate, one- 
third longer than the obtuse flowering glume. 
General distribution: in moist soil, Rhode Island to Florida, 
August to September. 
RHODE IsLAND: Shannock, Z. C. Moore, Aug. 14, 1896; Lake 
Werden, Æ. & C. E. Faxon, Aug. 24, 1881. 
This species is distinguished from Panicum agrostoides by its slen- 
der, simple, much flattened culms, long narrow leaves, ciliate ligule, 
long slender panicle branches and larger, more acute spikelets which 
are almost racemosely arranged, not glomerate as in that species. 
* * Panicle strict, narrow, the branches appressed; spikelets 5to 6 mm, 
long. 
6. PANICUM AMAROIDES Scribn. & Merrill, U. S. Dept. Agr. Div. 
Agros. Cir. 29: 5. 1901. (Panicum amarum minor Nasey & Scribn. 
U.S. Dept. Agr. Div. Bot. Bul. 8: 38. 1889, not F, capillare minor 
Muhl. 1817.) —A glabrous, glaucous, non-caespitose perennial, 3 to 8 
dm. high, from horizontal rootstocks, with thick often involute 
leaves and narrow, contracted panicles. Culms erect, often some- 
what branched below, stout, the lower internodes very short; nodes 
smooth. Sheaths loose, glabrous, crowded and overlapping; ligule a 
dense fringe of soft white hairs 2 to 3 mm. long ; leaf-blades very thick, 
smooth, lanceolate, acuminate, not narrowed at the rounded base, 1 
to 3 dm. long, 5 to ro mm. wide, strongly involute, at least above. 
Panicles 1 to 2.5 dm. long, few-flowered, the branches 1 to 7 cm. 
long, appressed. Spikelets glabrous, ovate, acuminate, 5 to 6 mm. 
long; first glume clasping the base of the spikelet, ovate, acuminate, 
strongly 7-nerved, three-fourths, or sometimes as long as the spikelet, 
usually scabrous on the keel toward the apex; second glume slight- 
ly exceeding the third, 7-nerved, similar to the first; third glume 
thin, faintly 7-nerved, enclosing the flowering glume and palea, sub- 
tending a thin palea of equal length and a staminate flower; flower- 
ing glume 3 to 3.5 mm. long, elliptical-ovate, smooth. 
General distribution: in sands along the coast, Connecticut to 
Florida and Mississippi, August to October. 
CoNNECTICUT: New Haven, D. C. Eaton, no date; J. A. Allen, 
Sept. 30, 1876; 4. L. Winton, /r., 1887. 
This species is readily distinguished from Panicum amarum Ell., 
by its smaller size, smaller panicles, larger spikelets and longer first 
glume, and is strikingly different from that species in habit of 
growth. 
* * * Panicle diffuse, the slender capillary branches widely spreading, single 
or fascicled ; spikelets generally long-pedicellate. 
+ Perennials. 
1 A stout erect plant ; spikelets glabrous. 
