LEMXACEAE. 75 



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. COMMELIXACEAE. 



Calyx and corolla of quite similar members and partly united ; stamens partly 

 adnate to the perianth. Fam. 23. Poxtideri.\ceae. 



Family 22. COMMELINACEAE. Spiderwort Family. 

 Perfect stamens 3, rarely 2 ; petals unequal ; bracts spathe-Hke. 



I. COMMELIXA. 



Perfect stamens 6, rarely 5 ; petals all alike ; bracts leaf-like. 2. Tradescantia. 



I. COMMELINA. Dav-flower, Dew-flower. 



I. 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. i. T. scopulonim. 



Flowers 2-^ cm. in diameter : calyx and pedicels usually densely glandular-pube- 

 scent ; leaves 6-8 mm. wide. 2. T. occidentalis. 



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 Caiion; Horsetooth Gulch; Wray. 



Family 23. PONTEDERIACEAE Dumort. Pickerell-weed Family. 

 I. HETERANTHERA Willd. 



I. 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. 



