60. Panicum Nashianum Scribn. Nash's Panic-Grass

Fig. 370

Panicum Nashianum Scribn. Bull. U. S. Dept. Agric.

Div. Agrost. 7: 79. 1897. P. patulum Hitchc. Rhodora, 8: 209. 1906.

Culms tufted, glabrous or puberulent, slender, 6'-15' tall, at length much branched. Sheaths glabrous, or the lower pubescent, the primary about one-third as long as the internodes, those on the branches overlapping; ligule a short sca-rious ring; blades erect or ascending, lanceolate, acuminate, smooth and glabrous, ciliate, at least at the base, 3/4'-2' long, 1"-2 1/2" wide, the leaves of the branches smaller; primary panicle 1-2' long, the branches widely spreading; spike-lets about 1" long, obovate, the first scale 1-nerved, the second and third scales 7-nerved, densely pubescent with short spreading hairs.

Pine lands, Virginia to Florida and Mississippi; also in the West Indies. March-July.

61. Panicum Liebergii (Vasey) Scribn. Lie-Berg's Panic-Grass

Fig. 371

Panicum scoparium Lam. var. Liebergii Vasey, Bull. U.

5. Dept. Agric. Div. Bot. 8: 32. 1889.

P. Liebergii Scribn. Bull. U. S. Dept. Agr. Agrost. 8:

6. 1889.

Culms erect, slender, glabrous, roughish, especially near the nodes, 1°-2° tall, at length branched. Sheaths papillose-hirsute with spreading hairs, usually longer than the internodes; ligule a short sca-rious ciliolate ring; blades erect or ascending, lanceolate, 2-4' long, 3"-6" wide, acuminate at the apex, rounded at the partly clasping base, papillose-hispid beneatli and sometimes sparingly so on the rough upper surface; panicle oblong, 2'-4' long, its branches erect or ascending; spikelets 1 1/2"-2" long, oval, the outer three scales papillose-hirsute with long spreading hairs, the first scale about one-half as long as the spikelet, ovate, acute, 1-3-nerved, the second and third scales broadly oval when spread out, 7-9-nerved

Dry soil, western New York to Manitoba and Kansas. June-July.

62. Panicum Scribnerianum Nash. Scribner's Panic-Grass

Fig. 372

Panicum scoparium S. Wats, in A. Gray, Man. Ed. 6, 632.

1890. Not Lam. 1797. P. pauciflorum A. Gray, Man. 613. 1848. Not Ell. 1817. P. Scribnerianum Nash, Bull. Torr. Club, 22: 421. 1895.

Culms erect, 6'-2° tall, simple or late in the season dichotomously branched above, sparingly pubescent. Sheaths strongly papillose-hispid, sometimes glabrate; blades 2'-4' long, 3"-6" wide, rounded or truncate at base, acuminate, more or less spreading, smooth above, scabrous beneath; panicles small, the primary one ex-serted, ovoid, 1 1/2'-3' long, the secondary ones much smaller and more or less included; branches of the primary panicle spreading, 8"-1 1/2' long, often flexuous; spikelets turgid, obovoid, a little over 1 1/2" long.

In dry or moist soil, Maine to British Columbia, south to Virginia, Texas and Arizona. June-Aug.

Panicum Helleri Nash, of the south-central states, differs in being glabrous or nearly so, and with smaller spike-lets. It is recorded from Missouri.