POACEAE. 29 



Alt. 6000-12,000 ft. Near Pagosa Peak; Ruxton Park; Mount Ouray; Mon- 

 tezuma ; Ruxton Dell ; Ribbon Lake ; South Park ; Colorado Springs ; Minne- 

 haha; Hinsdale Co.; Middle Park; southeast of Jefferson, South Park; 

 Pagosa Peak. 



26. SPOROBOLUS R. Br. DROPSEED, POVERTY-GRASS, WIRE-GRASS. 



Perennials. 



First glume one-half as long as the second or less ; plant not with long, scaly 



root-stocks. 



Branches of the panicle verticillate. i. 5". argutus. 



Branches of the panicle scattered. 



Spikelets about 2 mm. long ; first glume lanceolate. 



Sheath naked or sparingly ciliate at the throat ; empty glumes glabrous. 



2. S. air aides. 

 Sheath with a conspicuous tuft of hairs at the throat ; empty glumes 



scabrous on the keel. 



Leaf-blades 6 cm. long or less, widely spreading, involute ; sheath 

 pubescent with long hairs, at least towards the base. 



3. 5". Nealeyi. 

 Leaf-blades not widely spreading; sheaths glabrous, except the apex, 



and slightly on the margins. 

 Panicle usually more or less included in the sheaths ; its lower 



branches much exceeding the upper ones. 4. S. crypt andrus. 

 Panicle always exserted, oblong, comparatively narrow ; its lower 



branches but little, if any, exceeding the upper ones. 



5. 5. fiexuosus. 

 Spikelets 4.5-5 mm. long; first glume subulate, usually awned. 



6. S. heterolepis. 

 First glume almost equalling the second ; plants with long, scaly root-stocks. 



7. S. asperifolius. 

 Annuals ; empty glumes almost equal, ovate. 8. S. confusus. 



1. Sporobolus argutus (Nees) Kunth. On the plains from Kan. to Colo., 

 Tex. and Mex. ; also West Indies. Exact locality not given (Vasey). 



2. Sporobolus airoides Torn Dry prairies and river-valleys from Neb. to 

 Tex. and Calif. Alt. 4000-11,000 ft. Canon City; Marshall Pass; South 

 Park; Mancos; Fort Collins; Doyles; Arboles; Colorado Springs; La Porte; 

 Palisade, Mesa Co.; Grand Junction; Alamosa; Cottonwood Creek; Gun- 

 nison. 



3. Sporobolus Nealleyi Vasey. In dry places from Tex. to Colo, and N. 

 M. Alt. about 7500 ft. Vicinity of Alamosa. 



4. Sporobolus cryptandrus (Torr.) Gray. In sandy soil from Mass, to 

 Wash., Pa., Tex., Ariz, and Ore. Alt. 4000-8000 ft. Canon City; Empire; 

 Manitou; Denver; Deer Run; plains and foot-hills, near Boulder; Colorado 

 Springs; Fort Collins; Salida, Chaffee Co.; La Veta; Georgetown; Spring 

 Canon; Poudre Canon; gulch, west of Soldier Canon. 



5. Sporobolus flexuosus (Thurber) Rydb. (S. cryptandrus ftexuosus Thur- 

 ber.) In sandy places from Tex. to Nev. and Mex. Reported from Colo- 

 rado, but doubtful. 



6. Sporobolus heterolepis A. Gray. On dry prairies from Que. to Sask., 

 Pa. and Colo. Exact locality not given. 



7. Sporobolus asperifolius (Nees & Mey.) Thurber. On dry prairies from 

 Ass. to B. C, Mo., Tex. and Calif. Alt. 4000-7500 ft Cottonwood Creek; 



