GENUS 17. 



GRASS FAMILY. 



159 



65. Panicum Wilcoxianum Vasey. Wilcox's 



Panic-grass. Fig. 375. 



Panicum Wilcoxianum Vasey, Bull. U. S. Dept. Agric. 

 Bot. Div. 8: 32. 1889. 



Culms erect, 6'-io' tall, sparingly pubescent. Sheaths 

 papillose-hispid; ligule a ring of hairs; blades ii'-3' 

 long, less than 2" wide, long-acuminate, strongly pu- 

 bescent with long hairs; panicle about li' long, about 

 one-half as wide, oblong to ovoid, compact; branches 

 less than i' long, ascending, flexuous; spikelets ii"-ii" 

 long, ellipsoid ; first scale about one-quarter as long as 

 the spikelet ; second and third scales about equal, pu- 

 bescent ; fourth scale about as long as the third, obtuse. 



In dry soil, North Dakota to Manitoba, Iowa and Kan- 

 sas. July-Aug. 



66. Panicum Ravenelii Scribn. & Merr. 

 Ravenel's Panic-grass. Fig. 376. 



P. scoparium Chapm. Fl. S. St. 575. 1860. Not Lam. 



1797- 



P. Ravenelii Scribn. & Merr. Bull. U. S. Dep. Agr. 

 Agrost. 24: 36. 1900. 



Culms tufted, erect, i6'-2 tall, finally branched, 

 papillose-hispid below with spreading or ascending 

 hairs, the pubescence above softer ; sheaths densely 

 papillose-hirsute with ascending hairs ; blades 3 '-5' 

 long, 5"-io" wide, cordate at the clasping base, 

 broadly lanceolate, erect or ascending, glabrous on 

 the upper surface, densely and softly pubescent on 

 the lower surface ; panicle 3'-$' long, its branches 

 ascending; spikelets about 2" long and nearly \ as 

 wide, obovoid, pubescent with rather weak hairs. 



In woods, Maryland to Missouri, Florida and Texas. 

 May-July. 



67. Panicum scoparium Lam. Velvety Panic-grass. Fig. 377. 



Panicum scoparium Lam. Encycl. 4: 744. 1797. 



P. pubescens Lam. Encycl. 4: 748. 1797. 



P. viscidum Ell. Bpt. S. C. & Ga. i : 123. pi. 7. f. 3. 1817. 



Culms erect, 2-4 tall, simple or at length much 

 branched above, villous. Sheaths shorter than the 

 internodes, villous ; blades generally narrowed, some- 

 times rounded or truncate at base, softly pubescent, 

 those of the culm 4'-^' long, s"-8" wide, distant, those 

 of the branches \'-2\' long, 2 "-5" wide, crowded; 

 primary panicle 3 '-6' long, ovoid, branches ascending; 

 secondary panicles much smaller, not exceeding the 

 leaves; spikelets ovoid to oval, about li" long, pu- 

 bescent; first scale broadly ovate, about one-fourth as 

 long as the spikelet ; second and third scales nearly 

 orbicular, g-nerved, pubescent, the fourth oval, apicu- 

 late, i" long. 



^ Moist soil, Massachusetts to New Jersey, Pennsylvania, 

 Florida, Oklahoma and Texas. Cuba. June-Aug. 



