GRASS FAMILY 129 



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Panicle narrow or compact. 



Panicle narrow but loose; blades flat, usually 2y 2 to 5 lines wide 3. T. canescens. 



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 

 obscurely 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). 



L OCS . Mt. Tallac, Hitchcock 3147, 3148; Shadow Lake Trail, Congdon in 1899; Long 

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



Refs. TRISETUM BRANDEGEI Scribn. Bull. Torr. Club 10: 64. 1883. T. subspicatum 

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

 Tuolumiie, fiohtnder 5019. T. muticum Scribn. U. S. Dept. Agr. Div. Agrost. Bull. 11: 50. 

 1898. 



2. T. cermmm Trin. Culms rather lax, 2 to 4 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 !/4 to % inch long, with usually 3 distant florets, the 

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

 acuminate, 1-nerved, % line long, the second broad, 3-nerved, 1% 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. 



Refs. TRISETUM CERXUUM Trin. Mem. Aead. St. Petersb. VI. Math. Phys. Nat. 1: 61. 

 (Jan.) 1830; Thurb. in Wats. Bot. Cal. 2: 295. 1880; Davy in Jepson, Fl. W. Mid. Cal. 52. 

 1901. Avena nutkaensis Presl, Eel. Haenk. 1: 254. 1830. Trisetum nutkaense Scribn. & 

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



3. T. canescens Buckl. 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, 2y 2 to 3y 2 lines long; lemmas firm, sca- 

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

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

 usually about % inch long. 



Mountain meadows, moist 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 Mexico. Two specimens have a more condensed pan- 

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



Refs. TRISETUM CANESCENS Buckl. Proc. 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 allied species with acumi- 

 nate awned glumes and shorter pedicels. 



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



