390 POACE^. 



natural sections have yet been proposed. Among the synonyms 

 above are several which some one or more persons have j^roposed 

 as generic names for one or more species of Danthonia. 



A. Floral glume clothed with numerous long silky hairs. . . 1 



B. Floral glume with few silky liairs (a) 



a. Empty glumes 5-7-nerved 2 



a. Empty glumes 8-9-nerved 3 



a. Empty glumes 3-5-nerved (b) 



b. Leaf-blades short, the lower curly 4 



b. Leaf-blades long, not curly 5, 6 



1. D. sericea Xutt. Gen. 1: 71 (1818). 



Culms not tufted, 30-100 cm. long. Sheaths silky hairy; 

 blades narroAv, often 30 cm. long. Panicle narrow, 4-12 cm. long. 

 Spikelets 7-flowered, empty glumes nearly equal, 17 mm. long, 

 5-6-nerved, much exceeding the florets; floral glume 6 mm. long 

 to the base of the teeth, which are over half as long, conspicuously 

 hairy, especially near the margins; awns about 14 mm. long, flat 

 and brown at the base, twisted two to three times; j)alea shorter, 

 4-5 mm. long. 



Massachusetts, J. W. RohUns; New Jersey, Parker for Scrib- 

 ner 3542; South Carolina, Canly; Florida, Chirtiss 3542. 



Dry soil, New England to Florida, Colorado and California. 



2. D. Californica Boland. Proc. Calif. Acad. 2: 182 (1863). 

 Culms sometimes decumbent, 20-100 cm. high. Sheaths 



sparingly hairy ; blades smooth, narrow, involute, 3-10 cm. long. 

 Kaceme simple, of 3-10 spikelets. Spikelets broad, 5-10-flowered, 

 on pedicels of their own length; empty glumes nearly equal, 1.5-2.5 

 cm. long, reaching as far as the florets, 5-7-nerved, cross- veins con- 

 spicuous under a lens; floral glume broad, firm, shining, hairy near 

 the margins, about 9 mm. long to base of the teeth, which are one- 

 third as long, 9-nerved; awn brown at the base, about 1 cm. long, 

 and twisted once around; palea reaching nearly to the base of the 

 teeth on the floral glumes, obtuse, with many short spreading hairs 

 on the nerves. Grain oblong, flattened, concave, 4 mm. long. 



Montana, Watson 452; California, Bolander 10, Howell 363, 

 Hall 660, Kellogg 1106. 



