156 BRASSIACEAE 



Stem more or less hirsute. 5. R. hisptda. 



Stem glabrous. 



Stem tall, 3-8 dm. high ; stigma prominent, 2-Iobed. 



6. R. palustris. 

 Stem low, divaricately branched, 1-3 dm. high ; stigma scarcely thicker 

 than the style. 7. R. alpiua. 



Pedicels 2-5 mm. long ; pods globose. 8. R. sphaerocarpa. 



Pods oblong to lincar-cylindric, equalling or longer than the short pedicels. 

 Style about i mm. long. 



Leaves nearly all pinnatifid with obtuse divisions. 9. R. obtusa. 

 Leaves mostly sinuate, or, if pinnatifid, with acute divisions. 

 Pods short, ellipsoid, straight on straight pedicels. 



8. R. sphaerocarpa. 

 Pods elongated ovoid, curved on curved pedicels. 10. R. curvipes. 

 Style minute, 5 mm. or less long. 



Low, slender, less than 2 dm. high ; leaves not auricled at the base. 



11. 7?. lyrata. 

 Stouter, over 2 dm. high ; petioles of the stem-leaves auricled at the base. 



12. R. Underwoodii. 



1. Roripa Nasturtium (L.) Rusby. (Nasturtium officinale R. Br.) In 

 slow brooks and streams from N. S. to Wash., Va. and Calif. — Alt. 1200- 

 28CXD m. — Along Poudre, Ft. Collins; Durango ; plains and foot-hills near 

 Boulder; about Ouray; swamp near Ft. Collins. 



2. Roripa trachycarpa (A. Gray) Greene. {Nasturtium trachycarpum A. 

 Gray) On river banks in Colo.— Alt. about 6000 ft. — Walsenburg; "South- 

 western Colorado." 



3. Roripa calycina (Engelm.) Rydb. (A^ calycinuni Engelm.) On sandy 

 river bottoms from Mont, to Wash, and N. M. — Alt. about 5000 ft. — Ft. 

 Collin?. 



4. Roripa sinuata (Nutt.) A. S. Hitchc. (Nasturtium sinuatiim Nutt.) 

 On river banks and in wet ground from Minn, to Wash., Mo. and Ariz. — 

 Alt. 4000-8000 ft. — Ft. Collins ; Horsetooth Gulch ; Gunnison ; New Wind- 

 sor; mesas near Pueblo; Pike's Peak; near Boulder. 



5. Roripa hispida (Desv.) Britton. (N. hispidum Desv.) In swamps from 

 N. B. to the Mackenzie and B. C, south to Fla. and N. M. — Alt. 4000-9000 

 ft. — Ft. Collins; Cache la Poudre banks; Quimby; plains and foot-hills near 

 Boulder; Gunnison; Pass Creek. 



6. Roripa palustris (L.) Bess. (N. palustre DC.) In swamps from Lab. 

 to B. C, Ga., N. M. and Nev. — Alt. up to 10,000 ft. — Trapper's Lake; Du- 

 rango; Twin Lakes. 



7. Roripa alpina (S. Wats.) Rydb. (A'^. obtusum alpinum S. Wats.) In 

 wet places in the mountains from Mont, and Ida. to Colo, and Utah. — 

 Ft. Collins; Poudre Canon; Steamboat Springs; Fish Creek; Hotchkiss. 



8. Roripa sphaerocarpa (A. Gray) Britton. (N. sphaerocarpum A. Gray; A''. 

 obtusum sphaerocarpum S. Wats.) In wet places from Ills, to Wyo., Calif, 

 and Ariz. — North Park, near Wyoming line ; near Ironton, San Juan Co. 



9. Roripa obtusa (Nutt.) Britton. On sandy beaches and river banks from 

 Mich, to Wash., Tex. and Utah. — Alt. 4000-10,000 ft. — New Windsor; Mt. 

 Harvard; Massif de I'Arapahoe; Hotchkiss, Delta Co. 



10. Roripa curvipes Greene. In wet places in mountain valleys of Colo, 

 and Wyo. — Alt. 7000-8000 ft. — Squaw Hill, above Cimarron; Dale Creek, 

 Larimer Co.; Gunnison. 



