BRASSIACEAE. 155 



Basal leaf-blades oblanceolate. 



Plant usually over 3 dm. high ; flowers and fruit corymbose. 



9. L. Engelmanni, 

 Plant usually less than 3 dm. high ; inflorescence at least in fruit elongated, 



racemose. 10. L. stenophylla. 



Basal leaves broadly oval. n. L. ovalifolia. 



1. Lesquerella Shearis Rydb. On plains and foot-hills of Colo. Alt. 5000- 

 8000 ft. Boulder; Palmer Lake; Idaho Springs. 



2. Lesquerella curvipes A. Nels. On dry hills from Mont, to Colo. Alt. 

 up to 10,000 ft. Como. 



3. Lesquerella alpina (Nutt.) S. Wats. (Vesicaria alpina Nutt.) Dry Hills 

 from N. D. and Mont, to Colo. Florence; North Park. 



4. Lesquerella parvula Greene. On dry hills in Colo. Mt. Bross, Middle 

 Park. 



5. Lesquerella prostrata A. Nels. In dry places, in the mountains, from 

 Ass. to Colo. Alt. 5000-8000 ft. Northern State line; mountain near Veta 

 Pass ; between La Veta and Gardner. 



6. Lesquerella montana (A. Gray) S. Wats. {Vesicaria montana A. Gray) 

 On hillsides and in the mountains from Wyo. to N. M. Alt. 5000-11,000 ft. 

 Larimer Co.; Horsetooth Gulch; Palmer Lake; Fossil Creek; Ft. Collins; 

 Rist Canon, Larimer Co. ; Salida ; Mancos ; Trinidad ; mesas near Colorado 

 Springs ; river bluffs north of La Veta ; Los Pinos ; plains near Denver ; hills 

 southeast of La Veta ; Manitou ; Veta Pass ; South Park. 



7. Lesquerella arenosa (Richardson) Rydb. On dry hills from Sask. to 

 S. D. and Colo. Dolores. 



8. Lesquerella argentea (Pursh) MacM. (Vesicaria Ludoviciana DC.) 

 On plains and dry hills from Minn, to N. D., Kans. and Colo. Wray; north 

 of Craig, Routt Co. ; Clear Creek ; 25 miles below Manitou. 



9. Lesquerella Engelmanni (A. Gray) S. Wats. On dry mesas from Kans. 

 and Colo, to Tex. and N. M. Pueblo. 



10. Lesquerella stenophylla (A. Gray)* Rydb. (Vesicaria stenophylla A. 

 Gray and V. Fendleri, in part.) On dry mesas from Colo, to Tex. and N. M. ; 

 also in Mex. Alt. 4000-5000 ft. Florence; Swallow's, between Pueblo and 

 Canon City; mesas near Pueblo; Brantly Canon, Las Animas Co.; Pueblo. 



11. Lesquerella ovalifolia Rydb. (L. ovata Greene.) On dry mesas and 

 hillsides from Neb. to Colo, and Kans. Alt. about 1500 m. Mesas near 

 Pueblo. 



10. RORIPA Scop. WATER-CRESS. 



Aquatics, usually immersed and rooting, with pinnate leaves and white petals. 



i. R. Nasturtium. 

 Terrestrial or marsh plants with pinnatifid leaves and yellow petals (except in 



R. trachycarpa, 



Perennials with rootstocks ; petals much exceeding the sepals. 

 Pods pappillose. 



Leaves thin ; petals white ; fruit recurved. 2. R. trachycarpa. 



Leaves thick ; petals yellow ; fruit erect. 3. R. calycina. 



Pods not papillose. 4. R. sinuata. 



Annuals or biennials. 



Pods spherical to oblong-ellipsoid ; in the latter case shorter than the pedicels. 

 Pedicels 4-10 mm. long; pods 3-5 mm. long (rarely 6-7 mm. in R. palustris), 

 1.5-2 mm. thick. 



