128 GRAMINEAE 



blades flat, narrow, the basal cluster usually capillary; panicle narrow, as 

 much as a foot long, the branches slender, appressed; glumes 2 to 3 lines long; 

 lemmas 1 line long, similar to those of D. danthonioides, the awns shorter. 



Open ground, common in the Coast Ranges south to Santa Cruz and in the 

 lower Sierra Nevada, occasional in southern California; extends from Alasl 



to Arizona. 



Refs. DESCHAMPSIA ELONGATA Munro; Benth. PI. Hartw. 342. 1857; Davy in Jepson, 

 W. Mid. Cal. 51. 1901. Aira elongata Hook. Fl. Bor. Am. 2: 243. pi. 288. 1840. Deschampsia 

 elongate. Munro var. ciliata Vasey; Beal, Grasses N. Am. 2: 371. 1896; Davy in Jepson, Fl. 

 W. Mid. Cal. 51. 1901. Var. tennis Vasey; Davy in Jepson, Fl. W. Mid. Cal. 51. 1901, tj 

 from Santa Clara Co., Davy 213. 



4. D. caespitosa Beauv. Perennial; culms erect, 2 to 4 feet high; sheaths 

 smooth ; blades flat or folded, scabrous above ; panicle loose, drooping, 4 to 8 

 inches long, the slender scabrous branches spikelet-bearing toward the ends; 

 spikelet 2 lines long, the florets distant, the rachilla ^ the length of the lower 

 sessile floret; lemmas smooth, erose-truncate ; awn from near the base, but 

 little longer than the lemma, straight, articulated at the base, deciduous. 



Common in mountain meadows and bogs in the Sierra Nevada and in the high 

 mountains of southern California. The only specimens seen from the Coast 

 Ranges are : Sherwood, Davy & Blasdale 5180, 5181. Northern regions of the 

 northern hemisphere and southward in the mountains to Mexico. 



Refs. DESCHAMPSIA CAESPITOSA Beanv. Ess. Agrost. 91. pi. 18. f. 3. 1812. Aira 

 caespitosa L. Sp. PI. 64. 1753; Thurb. in Wats. Bot. Cal. 2: 297. 1880. Deschampsia 

 caespitosa Beauv. var. confinis Vasey; Beal, Grasses N. Am. 2: 369. 1896, type from Calif ornia, 

 Palmer 231. 



5. D. holciformis Presl. Perennial ; culms cespitose. 2 to 4 feet high, rather 

 stout ; blades tightly folded, or involute, firm, mostly basal, smooth or some- 

 what scabrous especially toward the tip, the cauline blades short; ligule 2 to 

 3 lines long; panicle narrow, rather dense, mostly dark or bronze-color, 6 to 

 8 inches long. 



Marshes, bogs, and moist places near the coast, from Del Norte Co. to Mon- 

 terey Co. 



Locs. Smith River, Davy $ Blasdale 6194; Eureka, Davy $ Blasdale 6213, 6214; Pt. 

 Arena, Davy $ Blasdale 6043; Pt. Reyes, Davy 6683; Petaluma, Piper 6318; San Francisco, 

 Bolander 6071; Oakland, Bolander 1524; Santa Cruz, Anderson; Pacific Grove, Davy 7508. 



Refs. DESCHAMPSIA HOLCIFORMIS Presl, Rel. Haenk. 1: 251. 1830; Davy in Jepson, Fl. 

 W. Mid. Cal. 50. 1901. Aira holciformis Steud. Syn. PI. Glum. 1: 221. 1854; Thurb. in Wats. 

 Bot. Cal. 2: 297. 1880. 



32. TRISETUM Pers. 



Spikelets 2 (rarely 3 to 5) -flowered, in narrow or open panicles. Glumes 

 unequal, the second about as long as the florets, keeled, the first 1-nerved, the 

 second 3-nerved. Rachilla prolonged behind the upper floret as a hairy bristle 

 or pedicel. Lemmas membranaceous, keeled, 2-toothed at the apex (teeth often 

 aristate), bearing a slender dorsal awn. Palea narrow, 2-toothed. Tufted per- 

 ennials. Species about 50, arctic and temperate regions and the high moun- 

 tains of the tropics. (Latin tres. three, and seta, bristle, the lemma often being 

 2-awned from the apex, and 1-awned from the back.) 



Awn included or wanting 1. T. Itrandegei. 



Awn exserted. 



Panicle loose and open, the branches naked at base 2. T. ccrnuum. 





