GRAMINEAE. 
15. Panicum clandestinum L. Hispid Panicum. (Fig. 257.) 
Panicum clandestinum I, Sp. Pl. 58. 1753. 
Panicum pedunculatum Torr. Fl. U.S. 141. 1824. 
Culms erect or ascending, 114°-4° tall, rather 
stout, simple at first, much branched later in the 
season. Sheaths longer than the internodes, much 
crowded on the branches, papillose-hispid, especi- 
ally the upper ones; leaves 2/8’ long, 34/-14’ 
wide, cordate-clasping at base, acuminate, smooth 
and glabrous, the margins ciliate at base ; primary 
panicle sometimes long-exserted; panicles of the 
branches below included in the sheaths, rarely 
slightly exserted; spikelets 1//-14’’ long, ellipsoid; 
first scale about one-third as long as the spikelet; 
second and third oval, acutish, 9-nerved, the fourth 
oval, obtuse, apiculate, whitish, shining. 
© In thickets, Quebee to Michigan, south to Georgia, 
Missouri and Texas. June-July. 
16. Panicum xanthophysum A. Gray. 
Slender Panicum. (Fig. 258.) 
Panicum xanthophysum A. Gray, Ann. Lyc. N. Y. 3: 
233. 1835. 
Culms erect, 1°-2° tall, simple. Sheaths spar- 
ingly papillose-pubescent; ligule very short; leaves 
3/-6’ long, %’—34’ wide, rounded at base, long- 
acuminate, erect, smooth and glabrous; panicle 
long-exserted, linear, 114’—4’ long, its branches ap- 
pressed ; spikelets few, about 11%4’’ long, obovoid, 
pubescent or glabrate; first scale about one-half as 
long as the nearly equal obtuse second and third; 
fourth scale indurated and shining, elliptic or oval. 
Dry soil, Maine and Ontario to Manitoba, south to 
New Jersey and Pennsylvania. Plant light green, 
becoming yellowish in drying. June-Aug. 
3 
4 
17. Panicum Scribnerianum Nash. Scribner’s Panicum. (Fig. 259.) 
1890. Not Iam. 
Ell. 1817. 
1895. 
Panicum scoparium var. minor Scribn. Bull. Uniy. Tenn. 
7:48. 1894. Not P. capillare var. minus Muhl. 1817. 
Panicum scoparium §. Wats. in A. Gray, Man. Ed. 6, 632. 
Panicum paucifiorum A. Gray, Man. 613. 1848. Not 
Panicum Scribnerianum Nash, Bull. Torr. Club, 22: 421. 
Culms erect, 6’-2° tall, simple or late in the season 
dichotomously branched aboye, sparingly pubescent. 
Sheaths strongly papillose-hispid, sometimes glabrate ; 
leaves 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, 114/—3’ long, the secondary ones much 
smaller and more or less included; branches of the 
primary panicle spreading, 8/’-1'%’ long, often 
flexuous ; spikelets turgid, obovoid, about 114’ long. 
In dry or moist soil, Maine and Ontario to Minnesota, 
south to Virginia, Kansas and Arizona. June-Aug. 
