Part 3, 1915] POACEAE 



267 



hairs ; leaf-sheaths pubescent like the culms, densely villous-ciliate at the summit ; blades rather 

 stiff, ascending, 4-9 cm. long, 3-7 mm. wide, glabrous on the upper surface, softly pubescent 

 to nearly glabrous beneath, strongly ciliate on the margin near the base, the thick cartilaginous 

 margin white at least when dry; panicles 5-8 cm. long, the branches ascending; spikelets 2 mm. 

 long, 1 mm. wide, elliptic, subacute; first glume one fourth to one third as long as the spikelet; 

 second glume and sterile lemma pubescent, the glume slightly shorter than the fruit at maturity ; 

 fruit 1.7 mm. long, 1 mm. wide, elliptic, obtuse. 



Autumnal phase spreading, branching from the middle and upper nodes, the branches 

 rather crowded, the reduced involute-pointed blades exceeding the ultimate panicles; blades 

 of the winter rosette as much as 7 cm. (rarely 12 cm.) long. 



Type locality: Wilmington, North Carolina. 

 Distribution: North Carolina and Alabama. 

 Illustration: Contr. U. S. Nat. Herb. 15: /. 263. 



158. Panicum tsugetorum Nash, Bull. Torrey Club 25: 86. 1898. 



Panicum lanuginosum siccanum Hitchc. & Chase; Hitchc. Rhodora 8: 207. 1906. 



Vernal plants usually pale bluish-green; culms 30-50 cm. high, spreading or ascending, 

 the lower nodes often geniculate, densely appressed-pubescent with short, crisp hairs, long 

 hairs more or. less copiously intermixed with these on the lower internodes or sometimes nearly 

 to the summit; leaf-sheaths commonly not much shorter than the internodes, pubescent like 

 the culm but less densely so, ascending-ciliate on the margin; ligule 1-1.5 mm. long; blades 

 thickish, firm, with a thin white cartilaginous margin, ascending, 4-7 cm. long, 4^7 mm. wide, 



i 



rounded at the base, acuminate, glabrous or with a few long hairs near the base on the upper 

 surface, appressed-puberulent beneath; panicles 3-7 cm. long, nearly as wide, the axis and 

 spreading, flexuous branches appressed crisp-puberulent; spikelets 1.8-1.9 mm. long, 1 mm. 

 wide, ob ovate-obtuse, rather turgid, short-pubescent; first glume one third to two fifths as long 

 as the spikelet, acute; second glume and sterile lemma barely equaling the fruit at maturity; 

 fruit 1.5 mm. long, 1 mm. wide, broadly elliptic, obtuse. 



Autumnal phase decumbent-spreading, branching from the lower and middle nodes often 

 before the maturity of the primary panicles, the branches ascending, the ultimate branchlets 

 appressed, the blades not greatly reduced nor crowded; winter rosette appearing rather early, 

 the blades often conspicuously long-pilose. 



Type locality : New York Botanical Garden. 

 Distribution: Maine to Illinois and Tennessee. 



Illustrations: Bull. U. S. Dep. Agr. Agrost. 17: /. 370; Contr. U. S. Nat. Herb. 15: /. 265; 

 Britt. & Brown, 111. Fl. 3: App./. 267 d; ed. 2./. 369. 



159. Panicum columbianum Scribn. Bull. U. S. Dep. Agr. Agrost. 7: 



78. 1897. 



Panicum keterophyllum Bosc; Nees, Agrost. Bras. 227. 1829. Not P. keterophyllum Spreng. 1822. 

 Panicum psammophilum Nash, Bull. Torrey Club 26: 576. N 1899. Not P. psammophilum Welw. 

 Jl 1899. 



Vernal plants light grayish-green, often purplish; culms tufted, 15-50 cm., rarely 60 cm. 

 high, stiffly ascending, densely crisp-puberulent with long, ascending, crimped hairs commonly 

 intermixed toward the base, but much less copiously than in P. tsugetorum; leaf -sheaths shorter 

 than the internodes, less pubescent than the culms, sometimes puberulent between the nerves 

 only; ligule less than 1 mm, long; blades firm, ascending or erect, 3-6 cm. long (seldom more than 

 5 cm. long), 3-5 mm. wide, broadest at the rounded base, the serrulate, often white, cartilagi- 

 nous margin usually involute toward the acuminate apex, typically glabrous on the upper sur- 

 face but sometimes sparsely pilose toward the base, densely appressed-puberulent to glabrous 

 beneath; panicles 2.5-4 cm. (rarely 5 cm.) long, about three fourths as wide, the lower branches 

 ascending, the axis and branches puberulent to nearly glabrous; spikelets 1.5-1.6 mm. long, 

 1 mm. wide, obovate, obtuse, turgid, densely short-pubescent; first glume one third to scarcely 

 half as long as the spikelet, acute or subacute; second glume and sterile lemma subequal, 

 scarcely covering the fruit at maturity; fruit 1.3 mm. long, 0.9 mm. wide, broadly elliptic, 

 obtuse. 



