POACEAE. 
55 
15. Agropyron Palmeri (S. & S.). (A. spicatum Palmeri S. & S.) In 
the mountains of Colo., N. M. and Ariz.—Alt. up to 7000 ft.—Mancos; Ar- 
boles; Quimby. 
16. Agropyron Bakeri E. Nelson. Mountains of southern Colo.—Alt. 9000 
ft.—Near Pagosa Peak. 
67. HORDEUM L. Barley, Squirrel-tail. 
Empty glumes all alike, subulate-filiform. 
Empty glumes 3-6 cm. long; flowering glume of lateral spikelets long-awned. 
1. H. jubatum. 
Empty glumes 1-2 cm. long; flowering glume of lateral spikelets short-awned 
or awn-pointed. 
Lateral spikelets flower-bearing. 2. H. boreale. 
Lateral spikelets neutral. 3. H. nodosum. 
Empty glumes of the middle spikelet lanceolate. 4. H. pusillum. 
1. Hordeum jubatum L. On prairies and in meadows from Lab. to Alaska, 
N. J., Tex. and Calif.—Alt* 4000-11,000 ft.—Mancos; Cerro Summit; Ar- 
boles; vicinity of Boulder; Fort Collins; Fort Morgan; Golden; New Wind¬ 
sor; Alpine Tunnel; Ute Pass; Twin Lakes. 
2. Hordeum boreale S. & S. In meadows from Mont, to Alaska, Colo, 
and Wash.—Alt. up to 10,000 ft.—Marshall Pass; South Park; Como; North 
Park. 
3. Hordeum nodosum L. In meadows from Mont, to Alaska, Tex. and 
Calif.—Alt. 5000-9500 ft.—Georgetown; North Park; South Park; Durango; 
Golden; Twin Lakes; Ft. Collins; Chamber’s Lake. 
4. Hordeum pusillum Nutt. In arid valleys from Ill. to Ida., Ga. and Ariz. 
—Alt. 4000-6000 ft.—Foot-hills, Larimer Co.; New Windsor, Weld Co.; near 
the river, east of Ft. Collins; Buckhorn Creek, Larimer Co. 
68 . SITANION Raf. 
Some of the empty glumes 2-cleft; lowest flower of one or both spikelets sterile 
and like the empty glumes, but inserted on a rachilla and falling away 
with it. 
Sterile shoots numerous; stem slender; flowering glume 3-awned. 
1. S'. Hystrix. 
Sterile shoots few; stem stout; flowering glume i-awned. 2. S. molle. 
Empty glumes all entire; lowest flower of both spikelets perfect. 
Flowering glumes glabrous. 
Stem-leaves very long, erect, flexuose, strongly involute. 3. S. longifolium. 
Stem-leaves short, rigid, spreading or divaricate. 4. S. brevifolium. 
Flowering glumes soft-pubescent. 5. S. pubiflorum. 
1. Sitanion Hystrix (Nutt.) Smith. ( Ageliops Hystrix Nutt.) On dry 
shale hills and among sage brush on the plains from Wyo. to Wash, and 
Colo.—Walsenburg; North Park. 
2. Sitanion molle J. G. Smith. On moist mountain-sides in Colo.—Alt. 
10,500 ft.—East side Buffalo Pass, Larimer Co. 
3. Sitanion longifolium J. G. Smith. On hillsides and among rocks from 
Nebr. to Nev., Tex. and Ariz.—Alt. 6500-9000 ft.—Villa Grove, Saguache 
Co.; Denver; Mancos; North Park; mountains of Larimer Co.; Hardin’s 
ranch; Oak Mesa, Delta Co.; Anita Peak, Routt Co. 
