29 
nerved, the lower one-half as long as the spikelet, third glume longer than the sec- 
ond and having a thick, rigid, obovate palet rather longer than its glume, and 
spreading apart from it, hence probably the name hians, from hio, to gape.—North 
Carolina to Texas. 
27. P. ciliatissimum Buckl. Culms procumbent and much branched, often root- 
ing at the joints, at first short-jointed and much condensed, with leaves 1 to 1} inches 
long, and the panicles short and invaginate, becoming elongated, with long-exserted 
peduncle (lateral and terminal) becoming 14 to 2 inches long, narrow, with afew 
short, few- flowered, appressed branches, and linear-lanceolate, acuminate leaves 2 to 
4 inches long, ciliate on the margins below, with sparsely ciliate and hairy sheaths, 
the nodes white-woolly ; spikelets ovate, acute, 2 lines long, pubescent or villous; 
the lower glume lanceolate, acute, 3-nerved, smooth, except at the base, two-thirds 
as long as the spikelet; second 11- to 13-nerved, pubescent to densely villous, with a 
smooth, acute, hardened point; the third, or flowering glume of the sterile flower 
alittle shorter than the second, 5-nerved, ciliate on the margins, its palet equally 
long, ovate, thin; the fertile flower one-fourth to one-third shorter than the largest 
glume, obtusish, minutely furrowed.—Texas. 
§ 7. Eupanicum Benth. 
23, P.XanthophysumGray. (Gray’s Manual, 6th ed., p. 631.) Culms erect, 1 to2 
feet high, simple or branched near the base ; leaves lanceolate, acuminate, 4 to 6 inches 
long, 5 to 10 lines wide, smooth, except the scabrous margins, strongly 9- to 11-nerved, 
rather contracted at the ciliate, clasping base; panicle long-exserted, 2 to 4 inches 
long, of afew, simple, erect or appressed, few-flowered branches; spikelets obovate, 
1} lines long, minutely downy; lower glume about half the length of the spikelet, 
second and third about 9-nerved. Plant yellowish green.—Canada to Pennsylvania 
and Wisconsin. 
29, P. pedicellatum Vasey. Culms 1 to 2 feet high, slender, branching below, 
smooth; culm leaves 2 to 3 inches long, 2 to 3 lines wide, gradually tapering to an 
acute point, erect, somewhat rigid; main panicle long-exserted, the lateral ones less 
so, all small and few-flowered, 14 to 2 inches long, of 4 or 5 short branches, each only 
2. to 3-flowered; spikelets long-pediceled, oblong-obovate, obtuse, 14 lines long, 
slightly pubescent, the lowest glume at some distance from the others,ovate, 1-nerved, 
nearly half as long as the spikelet; second and third glumes oblong, obtuse, 7-nerved.— 
Texas (J. Reverchon). 
Resembles P. angustifolium, Ell., but is smaller, with smaller, fewer-flowered pan- 
icle, and rather smaller spikelets. ; 
30. P. depauperatum, Muhl. (Gray’s Manual, 6th ed., p. 633. ) Culmserect, simple, 
tufted, 6 to 16 inches high; leaves of the culm about three, erect, narrowly linear, 3 
to 6 inches long; sheaths usually pubescent; panicle small, 1 to 2 inches long, con- 
tracted sometimes overtopped by the upper leaves; spikelets 1 to 14 lines long, 
obovate; lower glume one-third the length of the 7- to 9-nerved upper ones.—New 
England, New York, Pennsylvania, Virginia, Florida, Texas, Arkansas and Missouri. 
31. P. angustifolium Ell., non Chapman. Elliott’s Bot, 8. Car., I. p. 129. Culms 
weak, slender, smooth, 1 to 2 feet long, diffusely branched from the base; leaves 
linear, 3 to 5 inches long, 1 to 2 lines wide; sheaths short, nodes thickened; panicles 
simple, terminal and lateral, 3 to 5 inches long; the few branches single, capillary, 
distant, 1 to 3 inches long, bearing each 2 to 6 spikelets (mostly in pairs at the end 
of the branches); spikelets oblong-obovate, acute, 1} lines long, the outer glumes 
papillose-hispid, the lower one minute, acutish.—South Carolina to Texas. 
32, P. nitidum Lam. (Gray’s Manual, 6th ed., p. 632.) Culms 10 to 20 inches 
high, slender but firm, rarely branched, smooth ; leaves mostly at the base of culm, 
lanceolate or lance-linear, 1 to 2 inches long, rather rigid, and with the sheaths 
smooth, the culm leaves few and smaller; panicle ovate or oblong, 14 to 24 inches 
long; branches verticillate below, the lower ones 1 to 1} inches long, spreading, ca- 
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