344 BRASSICACEAE 



h 



12. C. nivalis (Greene) Rydb. Ccspitose perennial; stems 1-2 dm. high, 

 vei3^ leafy; leaves narrowly oblanceolate to linear, 3-5 cm, long, sparingly pubes- 

 cent; petals bright yellow, about 15 mm. long; pedicels about 5 mm. long, ascend- 

 ing; pods erect, 3-5 cm. long. Cheiranlhus nivalis Greene. Summits: Colo. 

 Mont. — Alp, Jl-Au. 



13. C. radicata Rydb. 



dm 



4r-7 cm. long; petals 



light yellow, about 15 mm. long; fruiting pedicels ascending; pods ascending, 

 tetragonal, about 4 cm. long. E. radicatum Rydb. High mountains: Colo. 



Subulp. — Alp. Jl. 



14. C. Wheeleri (S. Wats.) Rydb. A tall strigose biennial or perennial; 

 stem strict, simple, 3-6 dm. high, striate; basal leaves 2-7 mm. wide, subentire 

 or smuately denticulate, grayish strigose; stem leaves mostly narrowly linear, 

 the upper sessile; pedicels short, ascending; petals with slender claws, about 15 

 mm long, varying from orange or brown to rose-purple; pods four-angled, 

 slender, erect, 7-8 cm. long and 1.5 mm. in diameter; beak about 2 mm. long, 

 It ^V" T-- Wheeleri Rothr. E. alpestre Rydb., in part. Mountains: Colo.— 

 JN.M.— Ariz.— Utah. Submont.—Subalp. My-Jl. 



15. C. amoena (Greene) Rydb. Cespitose perennial; stem 1-3 dm. high; 

 leaves Imear-oblanceolate, 4-6 cm. long, more or less sinuate-dentate; petals 

 10-18 mm. long, brown, purple, or rose, with whitish claws; pedicels ascending; 

 pods erect, 3-5 cm. long. Cheiranlhus nivalis amoenus Greene. Erysimum 

 asperum alpestre Cockerell. E. Cocker ellianum Daniels. High mountains: 

 Colo. Mont.— Alp. J^Jl. 



16. C. Pallasii (Pursh) Rydb. Dwarf biennial; stem 2-10 cm. high, densely 

 leaty; leaves hnear-oblanceolate or linear, 1-2 cm. long, sinuate-dentate; sepals 

 scanous-margmcd ; petals deep purple, 10-16 mm. long; pedicels ascending; pods 

 ascending 4-5 cm long, 2 mm. thick. Cheiranlhus Pallasii Pursh. Arctic 

 regions: Grcenl.—Alta.— Alaska. Alp.—Subalp. Je-Jl. 



25. HESPERIS (Tourn.) L. Dame's Rocket, Dame's Violet, 



Perennial or biennial herbs, with forked hairs. Leaves simple, dentate, 

 flowers large, racemose, perfect. Sepals equal, not saccate at base. Petals 

 purple or white, with long claws and broad blades. Pod elongate, nearly cylm- 

 dric;_ valves keeled and 1-nerved. Stigma with 2 erect lobes. Seeds in a single 

 row m each cell, globose, wingless. Cotyledons incumbent. 



matronalis 



lp«-,r«o^ oo 1 "^^^^ GTeci, simple; branched above, S-lu am. mg", 



leaves £.^u cm. ong, ovate or ovate-lanceolate, dentate, 'pubescent on both 



l^^^' r. . PT''^'^' ?*''^' ^^ ^'^"te; pod 5-10 cm. long, ascending or spreading, 

 somewhat torulose when ripe. Fields and roadsides: N.S.— Pa.— la.-Mont.; 



escaped from cultivation; native of Eurasia. My-Au 



27. CAMPE Dulac. Winter 



leav^i'"''''!,^^ '''" P'^'^^^ii^! ^^fbs with angled stem, and alternate lyrate-pinnatifid 

 sSk- ilrr^ ?!?'^';^ '° ^^^^"^^^ 0^ panicles. Sepals erect, the outer tvvo 

 itSr .omfth ? A*^^ ^f^- ^^^^^ y^^o^^' spatulate, clawed. Pod elongate, 

 one rnwTn^ 1 H'^^'^'i'. .^*/l« «hort; stigma more or less 2-lobcd. Seeds m 

 R Br , nit Scop l*" ^^^tish, marginloss. Cotyledons accumbent. [Barbarea 



w 



Pod Obtusely angled: leaves with 1-4 pairs of di^-fsions 



D.visioas of the basal leaves 1-2 sSl^f pTirt?Snonder. ascending. 



Dhosions of the basal leaves 3-4 pairs: nod stouter. .r.nt. .nH .r.^rJ.-J: 



americana 



Pod sharply 4-angled ; leaves with 4-8 pairs of divisions. t C. mm: 



'^nli- divtSS^n?^^ ^'^^^^■} C*^^kereU. Biennial; stem 3-5 dm. high, glabrous, 

 ^mVnlillT • ^^^ basal leaves broadly elliptic stem -leaves with the petioles 

 auriculate-claspmg; petals 2-4 mm. long, light yeUow; pod 2-2.5 cm. long, 



