AVENE.E. 



391 



with the sj^ecies 

 Parish 1785, N. 



Eocky IMonntains, Washington, California,. 



Var. unispicata (Munro). D. nnispicata Mimro, Vasey, Cat. 

 Gr. 59 (1885). 



Cuhns 10-20 cm. liigh, densely tufted. Leaves silky hairy, the 

 hairs on the sheaths coming from white papillae. Spikelcts usually 

 solitary and terminal. 



Dr. Thurber in Bot. Calif, say this occurs 

 sometimes- coming from the same tufts. 



California, Tweedy 596; Howell^ Lemmon 467, 

 Trans. Cent. Surv. Canhy & Scribner 347. 



3. D. Mexicana Scribn. Proc. Phila. Acad. 301 (1891). 

 Culms GO-90 cm. high, erect, firm, scaberulous. Ligule acute, 



3 mm. long; blades of sterile shoots numerous, firm, erect, scaber- 

 ulous, convolute, 20-30 cm. long, those of the culm 3, the upper 

 10-12 cm. long. Panicle spikelike, strict, 15-22 cm. long, the 

 lowest rays rather remote, bearing 1-3 spikelets. Sjjikelets 3-4- 

 flowered, purple, about 15 mm, long; empty glumes elliptical- 

 lanceolate, 8-9-nerved, first 9 mm. long, second a little longer; 

 floral glume 7-9-nerved, silky hairy below, 5 mm. long to base of 

 teeth, which are 5 mm. long, awn 1-1.4 cm. long; palea extending 

 to the middle of the teeth of its glume. 

 Ovary 3 mm. long, with a pubescent 

 cushion-like summit, 



Mexico, Pringle 3279, limestone 

 ledges in September. 



4. D. spicata E. & S. Syst. 2: 690 

 (1817). A. glumosa Beauv. Agrost. 92 

 (1812). 



Culms tufted, 30-60 cm. high. 

 Leaf -blades short, narrow, involute, the 

 lower ones curly, sparingly silky hairy. ^^^ es.-Danthonia spicata. 



Simple panicle or raceme 2-6 cm. long. ^' spikelet; c, grain and 



palea. (Scnbuer.) 

 Spikelets 4-7-flowered, empty glumes 



3-nerved (or with 4-5 obscure nerves), first 10-12 cm. long, second 



a little shorter; floral glume about 3 mm. long to the teeth, which 



are half as long or longer, lower floral glume 7-nerved, awn flat, 



