MANUAL OF THE GRASSES OF THE UNITED STATES 



657 



Newfoundland to Minnesota, south 

 to Delaware, Tennessee, and Mis- 

 souri. 



Figure 957. — Panicum huachucae. Two views of 

 spikelet, and floret, X 10. (Type.) 



48. Panicum huachucae Ashe. 

 (Fig. 957.) Vernal phase light oli- 

 vaceous, often purplish, harsh to the 

 touch from copious spreading papil- 

 lose pubescence; culms usually stiffly 

 upright, 20 to 60 cm. tall, the nodes 

 bearded with spreading hairs; ligule 

 3 to 4 mm. long; blades firm, stiffly 

 erect or ascending, 4 to 8 cm. long, 

 6 to 8 mm. wide, the upper surface 

 copiously short-pilose, the lower 

 densely pubescent; panicle 4 to 6 

 cm. long, the axis and often the 

 branches pilose; spikelets 1.6 to 1.8 

 mm. long, obovate, papillose-pubes- 

 cent. Autumnal culms stiffly erect or 

 ascending, the branches fascicled, the 

 crowded blades ascending, 2 to 3 cm. 

 long, much exceeding the panicles. 

 % — Prairies and open ground, 

 Nova Scotia to Montana, south to 

 North Carolina and Texas, westward 

 here and there to southern California. 

 Naturalized in China and Japan. 



Panicum huachucae var. fascicu- 

 latum (Torr.) Hubb. Vernal culms 

 taller, more slender, less pubescent, 

 the culms 30 to 75 cm. tall; blades 

 thin, lax, spreading, 5 to 10 cm. long, 

 6 to 12 mm. wide, the upper surface 

 sparsely short-pilose or with copious 

 long hairs toward the base, the lower 

 surface pubescent and with a satiny 

 luster. Autumnal culms more or less 

 decumbent with numerous fascicled 

 branches. % (P. huachucae var. 



silvicola Hitchc. and Chase.) — Open 

 woods and clearings, Quebec to 

 Minnesota and Nebraska, south to 

 northern Florida and Texas; Ari- 

 zona (Tucson). 



Panicum huachucae, P. huachucae 

 var. fasciculatum, P. tennesseense, 

 and P. pacificum intergrade more or 

 less. The descriptions apply to the 

 great bulk of specimens, but the 

 distinctions fail to hold for occasional 

 specimens. 



Figure 958. — Panicum tennesseense. Two views of 

 spikelet, and floret, X 10. (Type.) 



49. Panicum tennesseense Ashe. 

 (Fig. 958.) Vernal phase bluish green; 

 culms suberect or stiffly spreading, 

 25 to 60 cm. tall, papillose-pilose or 

 the upper portion glabrous; ligule 

 dense, 4 to 5 mm. long; blades firm, 

 with a thin white cartilaginous mar- 

 gin, 5 to 8 mm. wide, the upper 

 surface glabrous or with a few long 

 hairs toward the base, the lower 

 surface appressed-pubescent or nearly 

 glabrous; panicle 4 to 7 cm. long; 

 spikelets 1.6 to 1.7 mm. long. Au- 

 tumnal culms widely spreading or 

 decumbent, with numerous fascicled 

 somewhat flabellate branches, often 

 forming prostrate mats ; blades usual- 

 ly ciliate at base. % — Open rather 

 moist ground and borders of woods, 

 Quebec to North Dakota, south to 

 Georgia and Texas, and also at a 

 few points west to Utah and Ari- 

 zona. 



50. Panicum lanuginosum Ell. 

 (Fig. 959.) Vernal phase grayish 

 olive green, velvety-villous through- 

 out; culms usually in large clumps, 

 40 to 70 cm. tall, lax, spreading, often 



