18 CRUCIFER^E. (MUSTARD FAMILY.) 



8. D. chrysantha, Watson. Stems 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- -i-+ Pods not glabrous. 



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

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

 or less : leaves rosulate and rather crowded at and above the 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. aiirea, Vahl. More or less canescenily 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-cilinte, 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. vcntosa, Gray. Depressed and cespitose, canescenily 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. CARDAMINE, L. BITTER CRESS. 



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, flcxuous, decumbent at 

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



