GRASS FAMILY 129 



Panicle narrow or compact. 



Panicle narrow but loose; blades flat, usually 21/. to 5 lines wide 3. T. caiiescens. 



Panicle spike-like. 



Sheaths pubescent 4. T. spicatum. 



Sheaths glabrous 5. T. congdoni. 



1. T. brandegei Scribn. Culms smooth, erect, 1 to 2 feet high ; sheaths 

 smooth or sparsely retrose-pilose ; blades flat, erect, 1 to 2 lines wide, scabrous 

 or more or less pilose; panicle narrow, usually spike-like, 2 to 4 inches long; 

 glumes about 3 lines long, scabrous on the keel, subequal, the first 1-nerved or 

 obscureh' 3-nerved, the second 3-nerved ; lemmas scaberulous, the lower 2 lines 

 long, the awn reduced to a bristle scarcely reaching the tip, or on the upper 

 lemma obsolete, the teeth acute, not aristate. 



Mountain meadows in the Sierra Nevada; also in the Cascades of Oregon 

 (the type). 



Locs.— Mt. Tallac, Hitchcock .3147, 3148; Shadow^ Lake Trail, Congdon in 1899; Long 

 Meadow, Tuolumne Co., BitchcocJc 3261; Kings River, Brewer 2822a. 



Eel's. — Trisetum bkandegei Scribn. Bull. Torr. Club 10: 64, 1883. T. subspicatum 

 Beauv. var. mutictim Boland.; Thurb. in Wats, Bot. Gal. 2: 296. 1880, type from the upper 

 Tuolumne, Bolunder .5019, T. mutirnm Scribn. U. S. Dept. Agr. Div. Agrost. Bull. 11: 50, 

 189S. 



2. T, cernuum Trin. Culms rather lax, 2 to i feet high; sheaths smooth; 

 blades thin, flat, lax, scabrous, 3 to 6 lines wide; panicle open, lax or drooping, 

 6 to 12 inches long, the branches verticillate, slender, flexuous, spikelet-bearing 

 toward the ends ; spikelet 14 to % inch long, with usually 3 distant florets, the 

 first longer than the second glume ; glumes very uneciual, the first narrow, 

 acuminate, 1-nerved, i/^ line long, the second broad, 3-nerved, l^/o to 2 lines 

 long; lemmas with setaceous teeth, the awns about as in T, canescens. 



Moist woods, Alaska to Montana and northern California : Humboldt Bay, 

 Chandler 1176; Mendocino Co., Bolander 4758, 6122, Brown 764, 



Befs. — Tkisetum cer.vuum Trin. Mem. Acad. St. Petersb. VL Math, Phys, Nat. 1: 61. 

 (Jan.) 1830; Thurb. in Wats. Bot. Cal. 2: 29,5. 1880; Davy in Jepson, Fl. W. Mid. Cal. 52. 

 1901. Avena nutkaensis Presl, Eel. Haenk. 1 : 254. 1830. Trinetum nutkaeiise Scribn. & 

 Merr.; Davy, Univ. Cal. Publ. Bot, 63, 1902; Davy in Jepson, Fl. W, Mid, Cal, ed, 2. 55. 1911. 

 ' 3. T, canescens Bui'kl. Culms erect, or decumbent at base, 2 to 4 feet high; 

 sheaths more or less retrose-pilose, at least the lower, and often also canescent; 

 blades flat, scabrous or canescent ; panicle narrow, loose, sometimes inter- 

 rupted and spike-like, 4 to 8 inches long; glumes smooth, except the keel, 

 strongly unequal, the first narrow, acuminate, 1-nerved, the second broad, 

 acute, 3-nerved, longer than the first, 2i/2 to 31/. lines long; lemmas firm, sca- 

 berulous, the upper exceeding the glumes, the teeth aristate ; awns geniculate, 

 spreading, exserted, more or less twisted l)elow, attached % below the apex, 

 usually about V^ inch long, 



IMountain meadows, moi.st ravines, and along .streams; Coast Ranges south to 

 Santa Cruz, and Sierra Nevada south to Tulare Co. ; north to Vancouver Island, 

 east to ^Montana and New Jfexico. Two specimens have a more condensed pan- 

 icle than usual (.Mt. Tamalpais, Davy 139; Mendocino Co., Bolander 4744). 



Refs. — Trisetum canescen.s Buckl. Proe. Acad. Phila. 1862: 100. 1863; Thurb. in Wats. 

 Bot. Cal. 2: 296. 1880; Davy in Jepson, Fl. W. Mid, Cal, 52, 1901, 



T. CHROMOSTACHYUM Desv, from Chile is a closely allird species witli acumi- 

 nate awned glumes and shorter pedicels, 



4. T, spicatum Richter. Culms erect, rather .stout, 6 to 18 inches high, 



