MUSTARD FAMILY 349 



white, obcordate or obovate; pods erect on ascending pedicels, 2-3 cm. long, 1.5 

 mm. wide; beak very short. Springs and river banks: Wyo. — N.M. — Ariz. — 

 Ida. Subtnont. — Mont. Je-Au. 



4. C. infausta Greene. Stem stout, 3-10 dm. high; leaf-blades rounded- 

 cordate or the lower reniform, simple, coarsely sinuately toothed, 3-4 cm. broad; 

 petals white, broadly spatulate, about 8 mm. long; pedicels in fruit spreading; 

 pods 2.5-3.0 cm. long, ascending, 1.5 mm. wide. C. cardiophylla Rydb., not 

 Greene. C i/icana (A. Gray) A. Nels. River banks and in water: Colo. — Utah. 

 Submoni. — Mont. Je-Au. 



5. C. Leibergii Holz. Perennial, with a horizontal rootstock; stems gla- 

 brous, erect, 1-3 dm. high; leaves simple or the lower divided into 3-5 segments, 

 thick; leaf-blade or terminal segment orbicular or oval, sinuately 5-9-lobed or 

 toothed; petals white, 4 mm. long; pods 2-2.5 cm. long, 1 mm. wide, erect on 

 ascending jiedicels; beak very short. C. callosicrenata Piper. Moist places in 

 the mountains: Ida. — -Mont. Submont. — Mont. Je-Au. 



6. C. angulata Hook. Perennial, with a strong rootstock; stem glabrous, 

 4-6 dm. high; leaves pinnate, with 3, rarely 5, petiolulate divisions; divisions 

 of the basal leaves rounded, coarsely toothed, those of the upper leaves rhombic- 

 ovate or -lanceolate, with large, acute lobes; petals white, 8-12 mm. long; pod 

 about 2 cm. long; nearly 2 mm. thick. Wet places and shallow water: B.C. — 

 Ore. — Wyo. Submont. My-Je. 



7. C. vallicola Greene. Perennial, with a rootstock; stems erect, 3-5 dm. 

 high, glabrous; leaves pinnate, with 5-9 divisions; terminal divisions rounded, 

 or ovate, often cordate at the base, 2-4 cm. wide; pods erect, 3-3.5 cm. long, 1.5 

 mm. wide, on ascending pedicels; beak 2.5-3 mm. long. (?) C. foliacea Greene. 

 Wet places: Wyo. — Colo. Submont. My-Au. 



8. C. Breweri S. Wats. Perennial, with a rootstock; stem erect, 3-6 dm. 

 high, glabrous or nearly so; terminal division of the leaves oval to rounded, 

 acute, truncate or rarely cordate at the base, 1.5-4 cm. broad, toothed; petals 

 5-6 mm. long; pods 3-3.5 cm. long, 1.5 mm. wide. Wet places: Mont. — Wyo. 

 — Calif. — B.C. Submont. — Mont. Je-Jl. 



9. C. unijuga Rydb. Perennial, with a slender rootstock; stem 2-3 dm. 

 high, glabrous, simple; basal leaves simple, broadly cordate or reniform, 5 mm. 

 wide, sinuately 3-lobed ; stem-leaves pinnately ternate, with oblong divisions, or 

 the terminal one rhomboid; petals spatulate, 2 mm. long; pod erect, 1.5-2 cm. 

 long, about 1 mm. wide; seeds 8-12; beak 1 mm. long or less. Wet places: Mont. 

 —Wyo. Submont. — Mont. Jl-Au. 



10. C. umbellata Greene. Perennial, with a rootstock; stems 2-5 dm. 

 high, glabrous or nearly so; leaves with 3-7 oval to oblong divisions, or the ter- 

 minal one rounded or reniform, glabrous; petals spatulate; pods 2-3 cm. long, 1 

 mm. wide, erect, on ascending pedicels; beak minute. C. kamtschatica (Regel) 

 Schulz. Wet places: Alaska — -Calif. — -Colo. — -Alta. Subalp. My-Au, 



11. C. pennsylvanica Muhl. Perennial, with a horizontal rootstock; stem 

 glabrous or nearly so, branched, 2-8 dm. high; leaves with 5-17 oblong, oval, 

 or obovate divisions, or the terminal one orbicular; pod erect or ascending, 2-3 

 cm. long, 1 mm. wide. Wet places: Newf. — Fla. — -Colo. — -Ore. — B.C. Plain — 

 Mont. Ap-Au. 



12. C. multifolia Rydb. Perennial, with a rootstock; stem about 2 dm. 

 high, very leafy; leaflets 7-13, those of the lower leaves oblong to oblong-obovate 

 or oval, entire or sinuate-dentate, the terminal one larger and obovate; pedicels 

 ascending; pod erect, about 2 cm. long and 0.75 mm. wide. Wet places: B.C. — 

 Utah^Mont. Plain — Mont. My-Je. 



13. C. acuminata (Nutt.) Rydb. Perennial, with a rootstock; stems 2-6 

 dm. high, somewhat pubescent below; leaves with 7-15 oblong to oval divisions, 

 or the terminal one broader, orbicular; petals about 3 mm. long; pod erect or 

 nearly so, 2.5-3 cm. long, 1 mm. wide. Wet places: Mack. — Alta. — (? Wyo.) 

 — Wash. — Alaska. Submont. Je-Au. 



