POACEAE. 
21 
1. Syntherisma humifusum (Pers.) Rydb. On roadsides, in old fields and 
waste places, introduced from the Old World and established from N. S. to 
Mont, and Colo, and Fla.—Alt. 4000-9000 ft.—Georgetown; Ft. Collins. 
2. Syntherisma sanguinale (L.) Dulac. ( Panicum sanguinale L.) In 
lawns, cultivated ground and waste places; introduced from the Old World 
and established from Mass, to Neb., Fla. and Calif.—Alt. about 5000 ft.— 
Boulder; Canon City; Ft. Collins. 
8. TRICHACHNE Nees. 
1. Trichachne saccharatum (Buckley) Nash. On dry hillsides from Colo, to 
western Tex., Ariz. and Mex.—Alt. up to 8500 ft.—Canon City; Fremont Co. 
9. PANICUM L. Panic-grass, Witch-grass, Switch-grass, Millet. 
Basal leaf-blades long and narrow ; spikelets lanceolate to ovate, acute to acu¬ 
minate. 
Annual. 1. P. capillare. 
Perennial with long, scaly root-stock. 2. P. virgatum. 
Basal leaf-blades ovate to lanceolate; spikelets elliptic to ovate or obovate, obtuse. 
Spikelets less than 2 mm. long. 3. P. unciphyllum. 
Spikelets more than 2 mm. long. 4. P. Scribnerianmn. 
1. Panicum capillare L. In sandy soil and waste places from S. Dak. to 
B. C., N. M. and Calif.—Alt. 4000-9500 ft.—Black Canon; Ft. Collins; Pike’s 
Peak; Grand Junction; near Boulder; Canon City; Colorado Springs; 
Graymont. 
2. Panicum virgatum L. In meadows and on river-banks from Me. to Ass., 
Fla. and Ariz.—Alt. 4000-7500 ft.—Ft. Collins; Golden; Trimble Springs; 
New Windsor, Weld Co.; near Boulder; La Veta; Tobe Miller’s ranch. 
3. Panicum unciphyllum Trin. (P. pubescens and P. dichotomum of Coult. 
Man.) In dry or sandy soil from Me. to B. C., Ga. and Ariz.—Exact local¬ 
ity not given. 
4. Panicum Scribnerianum Nash. (P. scoparium of Coult. Man.; not 
Lam.) In meadows from Me. to B. C., Va., Ariz. and Ore.—Alt. 4000-6000 
ft.—Foot-hills, Larimer Co.; Palmer Lake; Brantly Canon, Las Animas Co.; 
Boulder. 
10. ECHINOCHLOA Beauv. Barnyard-grass, Cockspur-grass. 
• 
1. Echinochloa Crus-galli (L.) Beauv. (Panicum Crus-galli L.) In sandy 
or alkaline soil, waste places and old fields.—Alt. 4000-5500 ft.—Golden; 
Grand Junction; Dry Creek, Larimer Co.; Canon City. 
Echinochloa Crus-galli mutica is a variety with short awn.—Golden; Tobe 
Miller’s ranch, near La Porte; Ft. Collins. 
n. CHAETOCHLOA Scribn. Fox-tail Grass, Italian Millet, Hungarian 
Grass. 
Inflorescence with the spikelets racemosely arranged; bristles 5-16 at the base 
of each spikelet, involucrate, tawny-orange. 1. C. glauca. 
Inflorescence with the spikelets in clusters or on branches; bristles 1-3 at the 
base of each spikelet, not involucrate. 
