AGROSTIDE^. 307 



smaller than in Mnldenhergia and often not quite terminal; the un- 

 awned species are distingiiished from Sporobolus by the fruiting 

 glume and grain which are nearly those of Agrostis. 



A. Empty glumes 7-8 mm. long 1 



B. Empty glumes shorter (a) 



a. Plant softly pubescent, awn 1-6 mm. long 2 



a. Plant not pubescent (b) 



b. Awn 2-10 mm. long 3 



b. Awn 10-18 cm. long 4 



a. Plant unawned (c) 



c. Some plants of 2 



c. Ligule 20-30 mm. long 5 



c. Ligule 10 mm. long 6 



c. Ligule shorter (d) 



d. Panicle 7-9 mm. broad 7 



d. Panicle broader (e) 



e. Ligule a mere ring 8 



e. Ligule 3 mm. long 9 



1. E. stricta (H. B. K.) Presl, 1. c. Crypsis strida H. B. K. 

 Nov. Gen. et. Sp. 1 : 140 (1815). Crypsirina stricta Fourn. Hemsl. 

 Biol. Centr. Am. Bot. 3: 549 (1880). 



An erect tufted perennial, 50-80 cm. high. Sheaths scabrid; 

 ligule 1-1.5 cm. long, decurrent; blade involute, about 1 mm. 

 diam., those of the sterile shoots 30 cm. long, those of the culm 

 10-15 cm. long. Panicle plumbous, dense, 5-10 cm. long, nearly 

 1 cm. diam.; empty glumes subequal, 1-nerved, 7-8 mm. long; 

 floral glume about 5 mm. long, 3-nerved, with an awn below the 

 tip 1 mm. long. 



Mexico, Pringle 4211. 



Cool slopes under pines, 11,000 feet altitude. 



2. E. lanata Presl, Reliq. Hjenk. 1:235 (1830). 



A tufted erect perennial, clothed througliout with soft short 

 pubescence. Culms compressed. Sheaths longer than the inter- 

 nodes; blades flat, conduplicate and distichous, scabrous on tlie 

 margins and keel, 20-50 cm. long, 3-4 mm. wide. Panicle ex- 

 serted, erect, 30-40 cm. long, 3-4 mm. diam. ; rays numerous, erect 



