Part 3, 1915] POACEAB 



263 



nodes after the maturity of the primary panicle, the reduced blades less pilose than the vernal 

 ones, exceeding the reduced panicles; winter rosette appearing rather early, the blades only 

 sparsely pubescent. 



Type locality: Castle Crag, California. 



Distribution: British Columbia and Idaho to southern California and Arizona, 



Illustration: Contr. U. S. Nat. Herb. 15: /. 241. 



i 



147. Panicum thermale Bolander, Proc. Calif. Acad. 2: 181. 1862. 



Vernal culms grayish-green, densely tufted, velvety-villous, 10-30 cm. high, ascending or 

 spreading, the nodes with a dense ring of short hairs; leaf-sheaths often overlapping, velvety- 

 villous; ligule 3 mm. long; blades thick, ascending or spreading, 3-8 cm. (mostly about 5 cm.) 

 long, 5-12 mm. wide, acuminate, rounded or a^bcordate at base, both surfaces densely 

 velvety-villous; panicles exserted or at high altitudes partly included, 3-6 cm. long, 

 about as wide, densely flowered, the axis villous, the flexuous branches spreading, often droop- 

 ing; spikelets 1.9-2 mm. long, 1 mm. wide, obovate-oblong, obtuse, turgid, papillose-pilose; 

 first glume about one third the length of the spikelet, obtuse or abruptly pointed ; second glume 

 and sterile lemma subequal, the glume shorter than the fruit at maturity; fruit 1.7 mm. long, 

 1 mm. wide, elliptic, subobtuse. 



Autumnal phase widely spreading, the branches appearing even before the primary pan- 

 icles are exserted, repeatedly branching, the whole forming a dense cushion, the blades and 

 panicles of the ultimate branchlets reduced; winter rosette appearing early, the blades ovate- 

 lanceolate, usually less pubescent than those of the culms. 



Type) locality: Sonoma County, California. 

 Distribution: Alberta to Wyoming and California. 

 Illustration: Contr. U. S. Nat. Herb. 15: /. 243. 



148. Panicum languidum Hitchc. & Chase, Contr. U. S. Nat. Herb. 



15: 232. 1910. 



Panicum unciphyllum f. prostratum Scribn. & Merr. Rhodora 3: 124. 1901. Not P. prostratum 

 Lam. 1791. 



Vernal phase tufted; culms 25-40 cm. high, weak, slender, ascending or spreading, pilose; 

 leaf -sheaths shorter than the internodes, papillose-pilose; ligule about 3 mm. long; blades thin, 

 lax, ascending or spreading, 4-7 cm. long, 4-9 mm. wide, acuminate, slightly narrowed to the 

 rounded base, sparsely pilose on the upper surface, minutely appressed-pubescent beneath, 

 usually with long hairs intermixed; panicles rather long-exserted, 3-6 cm. long, two thirds to 

 three fourths as wide, loosely flowered, the very flexuous branches finally spreading or drooping, 

 the spikelets on long, mostly divaricate, flexuous pedicels, the axis and branches sparsely long- 

 pilose; spikelets 2 mm. long, 1 mm. wide, elliptic, acute, pilose; first glume about one third the 

 length of the spikelet, obtuse or acute ; second glume and sterile lemma exceeding the fruit and 

 slightly pointed beyond it; fruit 1.5 mm. long, 1 mm. wide, obtuse. 



Autumnal phase decumbent, with geniculate, sometimes rooting nodes, branching from 

 all the nodes, the early branches nearly equaling the primary culm, repeatedly branching, 

 forming a large, loose straggling clump, the ultimate blades and panicles scarcely reduced. 



Type locality: South Berwick, Maine. 

 Distribution : Maine, Massachusetts, and New York. 

 Illustration: Contr. U. S. Nat. Herb. 15: /. 245. 



villosissimum 



1896. 



Panicum tectum Willd.; Spreng. Syst. 1: 313, as synonym. 1825. ■ 



Panicum dichotomum villosum Vasey, Bull. U. S. Dep. Agr. Bot. 8: 31. 1889. Not P. villosum 



Panicum niti'dum pubescens Scribn.; Kearney, Bull. Torrey Club 20: 479, hyponym. 1893. 



Panicum atlanticum Nash, Bull. Torrey Club 24: 346. 1897. 



Panicum haemacarpon Ashe, Jour. Klisha Mitchell Soc. 15: 55. 1898. 



Panicum xanthospermum Scribn. & Mohr; C. Mohr, Contr. U. S. Nat. Herb. 0: 348. 1901. 



Vernal plants light olive-green; culms densely tufted, 25-45 cm. high, slender, erect or 

 ascending, papillose-pilose with spreading hairs 3 mm. long; leaf-sheaths shorter than the-in- 

 ternodes, pilose like the culm; ligule 4^5 mm. long; blades rather firm, ascending or sometimes 



