GRASS FAMILY 133 



1. D. americana Scribn. Culms 1 to 2 feet high, smooth, tending to dis- 

 articulate at the nodes ; sheaths pilose ; blades short, flat, or those of the inno- 

 vations involute ; panicle bearing 2 to 5 spikelets, the pedicels usually about % 

 inch long, spreading or somewhat reflexed; glumes % to % inch long, smooth, 

 acuminate, about 7-nerved; lemmas 2% to 3% lines long, smooth and convex 

 on the back, pilose at base and margins, broad, abruptly contracted into 2 

 teeth with awns 1 to 3 lines long, the dorsal awn from between these teeth, 

 geniculate, flat and twisted below, straight and divergent above, exserted. 



Wet meadows and moist places in rocks, British Columbia to Wyoming, south 

 to the San Bernardino Mts. Also in Chile. 



Locs. Siskiyou Co., Butler 1660; Humboldt Co., Cliandler 1239; Mt. Tallae, Hitchcock 

 3158; Lake Tahoe, Seed $ Pendleton 1776; San Francisco, Davy 4211; Crystal Springs Lake, 

 Elmer 4707; Monterey, Davy 7237 in part, 7260; Kaweah Meadows, Purpus 5247; San Ber- 

 nardino Mts., Davidson 2319, Parish 3295. 



Refs. DANTHONIA AMERICANA Scribn. U. S. Dept. Agr. Div. Agrost. Circ. 30: 5. 1901, 

 based on D. grandiflora Phil. (1873) from Chile, not Hochst. (1851). Merathrepta americana 

 Piper, Contr. Nat. Herb. 11: 123. 1906. Piper assumes that the type species of Danthonia 

 DC. is D. decumbens, which is not congeneric with D. spicata and its allies. I believe, how- 

 ever, that D. spicata should be taken as the type of Danthonia, in which case the latter name 

 is retained for the California species. 



2. D. unispicata Munro. Culms short, 6 to 8 inches high, about as long as 

 the numerous basal leaves; sheaths and blades pilose; panicle reduced to a 

 single spikelet, the pedicel about % inch long, flexuous, pubescent above, the 

 joint at base bearing 1 or 2 bracts; spikelets about as in D. americana, the 

 lemma more gradually acuminate into awns. 



Rocky hills, Modoc and Lassen cos., and from Oregon to Wyoming. 



Locs. Modoc Co., Baker fy Nutting in 1894; Egg Lake, Davy; Loon Valley, Davy; Red 

 Clover Valley, Heller $ Kennedy 8705. 



Refs. DANTHONIA UNISPICATA Munro; Thurb. in Wats. Bot. Gal. 2: 294. 1880, as synonym 

 under D. calif ornica Boland. var. unispicata Thurb. in Wats. Bot. Cal. 2: 294. 1880. 



3. D. californica Boland. Resembles D. americana ; culms 2 to 3 feet tall ; 

 sheaths smooth or somewhat pilose at the throat; blades scabrous above, 

 longer, especially those of the less numerous innovations ; teeth of lemma more 

 gradually acuminate. 



Dry hills, Coast Ranges as far as San Luis Obispo, apparently rare in the 

 Sierra Nevada; extends north to British Columbia and east to Montana and 

 Colorado. 



Locs. Ukiah, Davy fy Blasdale 5056; Mendocino Co., McMurphy 405; Sherwood, Hitchcock 

 2693, 2727; Lovelock, Leiberg 5058; Mt. Tamalpais, Chase 5675, Piper 6313; San Francisco, 

 Bolander 1533; Monterey, Elmer 3306; Pacific Grove, Heller 6647; Yosemite Valley, Hitch- 

 cock; San Luis Obispo, Jones 3248. 



Refs. DANTHONIA CALIFORNICA Boland. Proc. Cal. Acad. 2: 182. 1863, type from vicinity 

 of San Francisco, Bolander; Thurb. in Wats. Bot. Cal. 2: 294. 1880; Davy in Jepson, Fl. 

 W. Mid. Cal. 55. 1901 ; Abrams, Fl. Los Ang. 40. 1904. 



4. D. intermedia Vasey. Culms 6 to 15 inches high ; sheaths smooth ; blades 

 becoming involute, more or less pilose ; panicle narrow, compact, often 1-sided, 

 1 to 2 inches long, the pedicels short and appressed ; glumes about */2 mcn long ; 

 lemmas similar to those of D. americana, the teeth more gradually acuminate, 

 the awns shorter, the dorsal awn flat, tightly twisted below, slightly twisted 

 above. 



Mountain meadows in the high Sierra Nevada ; extends from British Colum- 

 bia to Quebec and south to New Mexico. 



Locs. Mt. Tallae, Hitchcock 3144; Yosemite Nat. Park, Ostrander's, Bolander 6104; 



