18 CRUCIFER^E. (MUSTARD FAMILY.) 



8. D. chrysantha, Watson. Sterns decumbent or erect from a branch- 

 ing rootstock, which becomes covered with the persistent bases of dead leaves, 

 sparingly pubescent with simple hairs : basal leaves narrowly oblanceolate, 

 mostly entire; the cauline oblauceolate to lanceolate : flowers bright yellow: 

 pod oblong, acute at each end and beaked by a slender style. Proc. Am. 

 Acad. xvii. 364. In the high mountains of Colorado and southward into 

 Arizona. 



*-* -W- Pods not glabrous. 



9. D. montana, Watson. Hoary-villous with simple or branching rigid 

 hairs, rather stout, erect, simple or sparingly branched, becoming a span high 

 or less : leaves rosulate and rather crowded at and above tlie base of the stem, 

 oblanceolate, sparingly toothed : pods linear-oblong, obtusish, roughly puberulent, 

 nearly erect upon spreading pedicels; style none. Wheeler's Rep. vi. 63. 

 Colorado. 



10. D. aurea, Vahl. More or less canescently stellate pubescent and usually 

 somewhat villous with branching hairs : stems 3 to 18 inches high, solitary or 

 several from the same root, simple or branched : leaves oblanceolate, petioled ; 

 the upper sessile, oblong to oblong-ovate, entire or sometimes sparingly 

 toothed : petals yellow fading to white : pods linear-lanceolate, attenuate upward 

 into a short style, puberulent, often somewhat twisted. [From Colorado to British 

 America. 



Var. stylosa, Gray. Style as long as in the next. Southwestern 

 Colorado. 



11. D. Streptocarpa, Gray. A span high, with simple or simply forked, 

 long, rigid, shaggy, spreading hairs : radical leaves rosulate, spatulate-lanceolate, 

 attenuated into a large-margined petiole ; cauline very entire, sessile : racemes 

 often paniculate: petals golden-yellow: pods linear or oblong-ovate, minutely or 

 strongly hispid-ciliatc, usually much twisted with often 3 or 4 turns ; style long. 

 In the mountains of Colorado to the very summit, the alpine forms being 

 much dwarfed. 



12. D. ventosa, Gray. Depressed and ccspitose, canescently tomentose 

 throughout, the pubescence stellate : leaves crowded on the mostly tufted 

 branches, spatulate-oblong or obovate, entire : peduncle in fruit exserted be- 

 yond the leaves: petals golden-yellow: pod oval or orbicular, tomentulose-hirsute, 

 tipped with a short distinct style. Am. Naturalist, viii. 212. " On a high rocky 

 peak overlooking Snake and Wind River valleys," Parry. 



2. CARD AMI WE, L. BITTER CRESS. X 



Sepals equal. Pod linear, seeds in one row. Growing in wet places, 

 usually with running rootstocks or small tubers ; leaves all petioled, simple or 

 pinnate. 



1. C. COrdifolia, Gray. Stem I to 3 feet high, erect, simple, leafy to the 

 top : leaves cordate, sparingly repand-dentate or angular-toothed, ciliate, 2 to 4 

 inches across ; lowest orbicular ; upper triangular-cordate : flowers rather large : 

 pods erect. C. rhomboidea of Hayd. Rep. 1871. From New Mexico and 

 Colorado to Oregon. 



2. C. Breweri, Watson. Stem 6 to 18 inches high, flexuons, decumbent at 

 base, usually simple : leaflets 1 or 2 pairs, rounded or oblong, the terminal much 



