GRASS FAMILY. 
18. Panicum Wilcoxianum Vasey. Wil- 
cox’s Panicum. (Fig. 260.) 
Panicum Wilcoxianum Vasey, Bull. U. S. Dept. 
Agric. Bot. Div. 8:32. 1889. 
Culms erect, 6/10’ tall, sparingly pubescent. 
Sheaths papillose-pubescent ; ligule a ring of hairs ; 
leaves 114’-3/ long, less than 2’’ wide, long-acum- 
inate, strongly pubescent with long hairs; panicle 
about 114’ long, oblong to ovoid, compact ; branches 
less than 1’ long, spreading or ascending, flexuous ; 
spikelets about 144/’ long, ellipsoid; first scale 
about one-quarter as long as the spikelet ; second 
and third scales about equal, pubescent; fourth 
scale about as long as the third, obtuse. 
In dry soil, Nebraska. July—Aug. 
1g. Panicum boreale Nash. Northern Panicum. (Fig. 261.) 
Panicum boreale Nash, Bull. Torr. Club, 22: 421. 1895. 
Culms at first erect and simple, 1°-2° tall, later 
decumbent and somewhat branched, smooth and 
glabrous. Sheaths shorter than the internodes, 
usually smooth, ciliate ; ligule short, ciliate ; leaves 
3/-5’ long, 1 ’—14/ wide, erect, truncate or rounded 
at the sparsely ciliate base, acuminate ; panicle 2/— 
4 long, ovoid, its branches 1/—2’ long, spreading or 
ascending ; spikelets 1’’ long, about equalling the 
pedicels, ellipsoid, somewhat pubescent; first scale 
ovate, obtuse, about one-third as long as the spike- 
let ; second and third scales oblong-ovate, 7-nerved, 
pubescent, equalling the fourth, which is oval, 
acute, and slightly more than 3/’’ long; palet of 
third scale usually empty. 
Moist soil, Newfoundland and Ontario to New York, 
Vermont and Minnesota. Summer. 
20. Panicum laxiflorum Lam. Lax-flowered Panicum. (Fig. 262.) 
‘ 
Panicum laxiflorum Yam. Encycl. 4: 748. 1797. 
Culms erect, 8’—16/ tall, simple, pubescent or glab- 
rate. Sheaths shorter than the internodes, hirsute; 
leaves 214/-5’ long, 2’’-5’’ wide, erect, generally nar- 
rowed at base, long-acuminate, pubescent or glabrate ; 
panicle 2/-4’ long, its axis and erect or spreading 
branches sometimes hirsute ; spikelets about 1/’ long, 
ellipsoid or narrowly obovoid, strongly pubescent ; 
first scale minute, 1-nerved; second and third about 
equal, g-nerved, very pubescent, as long as the shining 
obtuse minutely apiculate fourth one; third scale 
usually with an empty palet. 
Moist soil, Virginia to Kentucky, south to Florida. 
Also reported from much further north. It has been con- 
founded with the preceding species. June-Aug. 
