LEMNACEAE. 
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Parlin, Gunnison Co.; Van Boxle’s ranch, above Cimarron; near Grand 
Lake; Spicer, Larimer Co. 
2. Lemna gibba L. In ponds from Nebr. to Cal., Tex. and Mex.; also in 
the Old World and Australia.—Alt. 3500-12,500 ft.—Pike’s Peak; near 
Boulder. 
3. Lemna minor L. In still water and slow streams from Lab. to Alaska, 
Fla. and Mex.; also in the Old World and Australia.—Alt. 4000-9000 ft.— 
Trinidad; along Uncompahgre River, near Ouray; Ironton Park, 9 miles 
south of Ouray; Hayden, Routt Co. 
Order 15. XYRIDALES. 
Calyx and corolla free, of very different members; stamens free. 
Fam. 22. CoMMELINACEAE. 
Calyx and corolla of quite similar members and partly united; stamens partly 
adnate to the perianth. Fam. 23. Pontideriaceae. 
Family 22. COMMELINACEAE. Spiderwort Family. 
Perfect stamens 3, rarely 2 ; petals unequal; bracts spathe-like. 
1. Com MELINA. 
Perfect stamens 6, rarely 5; petals all alike; bracts leaf-like. 2. Tradescantia. 
1. COMMELINA. Day-flower, Dew-flower. 
1. Commelina crispa Wooton. In sandy soil from Mo. to Neb., Colo., Tex. 
and N. M. —Alt. 4000-6500 ft.—Canon City. 
2. TRADESCANTIA L. Spiderwort. 
Flowers 1-1.5 cm. in diameter; plant glabrous or calyx and pedicels sparingly 
glandular; leaves 4-6 mm. wide. 1. T. scopulorum. 
Flowers 2-3 cm. in diameter; calyx and pedicels usually densely glandular-pube¬ 
scent ; leaves 6-8 mm. wide. 2. T. occidentals. 
• 
1. Tradescantia scopulorum Rose. In moist ground from Black Hills of 
S. D. to Colo., N. M. and Ariz.—Alt. 4000-5000 ft.—Boulder; Denver; Colo¬ 
rado City. 
2. Tradescantia occidentalis Britton. On sand-hills and in rocky ground 
from Neb. to Mont., Tex. and N. M.—Alt. 4000-6000 ft.—Denver; Eads; New 
Windsor; Fort Collins; Walsenburg; near Boulder; Pennock’s mountain 
range; Spring Canon; Horsetooth Gulch; Wray. 
Family 23. PONTEDERIACEAE Dumort. Pickerell-weed Family. 
1. HETERANTHERA Willd. 
1. Heteranthera limosa (Sw.) Willd. In shallow water or mud from Va. 
to Neb., Fla. and La. and Colo.; also W. Ind., Mex. and Cent. Am.—Alt. 
4000-5500 ft.—Between Longmont and Loveland; eastern Larimer County; 
west side of Cache La Poudre; Limnath Co. 
