12S GRA.MINEAE 



blades tiat, narrow, the basal c-liister usually capillary; paniT;le narrow, as 

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

 lemmas 1 line long, similar to those jof D. dauthonioides, the awns shorter. 



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

 lower Sierra NcA'ada, occasional in southern California; extends from Alaska 



to Arizona. 



Refs. — Deschajipsia elongata Muino; Bcnlli. PI. Hartw. 342. 18.57; Davy in Jepson, Fl. 

 W. MUl. Cal. .51. 1901. Aira elongata Hook. Fl. Bor. Am. 2: 243. pi. 2S8. 1840. Descliampsia 

 elongata J[unro var. ciliata Vascy; Beal, Grasses N. Am. 2: 371. 1S96; Davy in Jepson, Fl. 

 W. ma. Cal. 51. 1901. Var. tenuis Vasey; Davy in Jepson, Fl. W. Mid. Cal. 51. 1901, type 

 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; 

 spikele-t 2 lines long, the florets distant, the raehilla y^ 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 lO Itkisdulc 5180,5181. Northern regions of the 

 northern hemisphere and southward in the mountains to Mexico. 



Refs. — Descuampsia caespitosa Beauv. Ess. Agrost. 91. pi. 18. f. 3. 1812. Aira 

 eaespitosa h. Sp. PI. 04. 1753; Tluirb. in Wats. Bot. Cal. 2: 297. 1880. Descliampsia 

 eaapitosa Beauv. var. confinis Vasey; Beal, Gra.sses N. Am. 2: 369. 1896, type from California, 

 I'tilmer 231. 



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

 stout; l)lades tightly folded, or involute, firm, mostly basal, smooth or some- 

 what scabrous e.specially toward the tip. the cauline blades short; ligule 2 to 

 3 lines long; panicle narrow, rather deuse. mostl>" dark or bronze-color, 6 to 

 8 inches long. 



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

 terey Co. 



Loes.— Smith River, Davij <j- BlasJale (3194; Eureka, Daiy <|- Bla:<dale 6213, 6214; Pt. 

 Arena, Daiij tf- Jilasdale 6043; Pt. Reyes, Davy 6683: Petaluma, Piper 6318; San Francisco, 

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



Refs. — Beschampsi.^ iiolcifcrmis Presl. Rcl. Haenk. 1: 251. 1830: Davy in Jepson, Fl. 

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

 But. Cal. 2: 297. 1880. 



;!2. TRISETUM Pers. 



Spikelets 2 (rarely 3 to 5)-flowpren. in narrow or open piinicles. Glumes 

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

 second 3-nerved. Raehilla jirolonged 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 lemnnt often being 

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



Awn included or wanting 1. 2'. hrandcgei. 



Awn e.xserted. 



Panicle loose and open, the branches naked at base 2. 1'. eernuum. 



