262 NORTH AMERICAN FLORA [Volume 17 



144. Panicum subvillosum Ashe, Jour. Elisha Mitchell Soc. 16: 86. 



1900. 



Panicum unciphyllum f.pUosumScribn.&Merr.TZhodoraS: 124. 1901. Hot P. pilosum Sw. -1788. 



Vernal culms tufted, 1 0-45 cm. high, slender, ascending or spreading, pilose with ascending 

 hairs, usually faintly papillose, the lower internodes short, thus making the plant more leafy 

 below, the nodes short-bearded; leaf -sheaths sparsely pilose with ascending hairs, the lower 

 overlapping, the upper much shorter than the long internodes; ligule 3 mm. long; blades rather 

 firm, ascending, 4—6 cm. long, 4-6 mm. wide, rarely wider, acuminate, slightly narrowed toward 

 the base, both surfaces pilose, the hairs on the upper surface 3-5 mm. long, shorter on the lower; 

 panicles long-exserted, ovate to oblong in outline, 3-5 cm. long, two thirds to three fourths as 

 wide, rather densely flowered, the axis pubescent or toward the base pilose, the lower branches 

 ascending; spikelets 1.8-1.9 mm. long, 0.9 mm. wide, elliptic, obtuse, pubescent; first glume 

 nearly or quite half the length of the spikelet, acuminate; second glume scarcely equaling the 

 the fruit at maturity; fruit 1.5 mm. long, 0.8 mm. wide, elliptic, obtuse. 



Autumnal phase widely spreading, sparingly branching from the lower nodes, the leaves 

 and panicles not greatly reduced, the panicles overtopped by the leaves, these less copiously 

 pilose. 



Typb locality: Carlton, Minnesota. 



Distribution: Nova Scotia to Minnesota, and south to Connecticut and northern Indiana. 



Illustration: Contr. U. S. Nat. Herb. 15: /. 237. 



145. Panicum occidentale Scribn. Rep. Mo. Bot. Gard. 10: 48. 



1899. 



Vernal phase tufted, yellowish-green; culms slender, 15-40 cm. high, rarely higher, spread- 

 ing, the lower internodes usually short, as in P. subvillosum, producing a leafy base as in that 

 species, sparsely papillose-pubescent, the upper more or less' elongate, glabrate, the nodes 

 pubescent; leaf-sheaths rather sparsely papillose-pubescent, rarely almost glabrous; ligule 

 3-4 mm. long; blades firm, erect or ascending, 4-8 cm. long, 5-7 mm. wide, acuminate, rounded 

 at the base, the upper surface with a few long hairs toward the base and margin, otherwise 

 glabrous, the under surface appressed-pubescent ; panicles long-exserted, 4-7 cm. long, about 

 two thirds as wide, rather loosely flowered, the flexuous branches ascending or spreading; 

 spikelets 1.8 mm. long, 1 mm. wide, elliptic-ob ovate, subacute, pubescent; first glume one fourth 

 the length of the spikelet or less, obtuse or pointed; second glume and sterile lemma as long as 

 the fruit at maturity; fruit 1.6 mm. long, 0.9 mm. wide, elliptic, subacute. 



Autumnal phase branching from the lower nodes, forming a spreading bunch or tussock, 

 10-15 cm. high; leaves and panicles reduced; winter rosette appearing late, the blades narrowly 

 lanceolate, glabrous or pilose at base. 



Type locality: Nootka Sound, Vancouver Island. 

 Distribution: British Columbia and Idaho to southern California. 

 Illustration: Contr. U. S. Nat. Herb. 15: /. 239. 



146. Panicum pacificum Hitchc. & Chase, Contr. U. S. Nat. Herb. 



15: 229. 1910. 



i 



Vernal phase light-green; culms tufted, 25-50 cm. high, ascending or spreading, leafy 

 (culm-leaves 5 or 6), papillose-pilose with spreading hairs, the nodes shortly spreading-pilose ; 

 leaf-sheaths papillose-pilose, the papulae prominent; ligule 3-4 mm. long; blades erect or as- 

 cending, 5-10 cm. long, 5-8 mm. wide, acuminate, narrowed toward the rounded base, the 

 upper surface papillose-pilose, typically with short hairs intermixed, but these often wanting 

 and the long hairs sometimes sparse, the lower surface appressed papillose-pubescent; panicles 

 usually rather short-exserted, 5-10 cm. long, about three fourths as wide, the flexuous branches 

 ascending; spikelets 1.8-2 mm. long, 1-1.1 mm. wide, obovate, obtuse, turgid, papillose-pubes- 

 cent ; first glume one fourth to one third the length of the spikelet, truncate ; second glume and 



i 



sterile lemma equaling the fruit at maturity; fruit 1.6 mm, long, 1 mm. wide, elliptic-obovate, 

 obtuse or obscurely pointed. 



Autumnal phase prostrate-spreading, repeatedly branching from the middle and upper 



