WOOTON AND STANDLEY fLORA OF NEW MEXICO. 277 



KEY TO THE SPECIES. 



Winter annuals; styles obsolete. 



Petals yellow; leaves extending well up on the stem 1. D. montana. 



Petals white or wanting; leaves clustered at the base of the 

 stem. 



Petals wanting or very small ■ 2. D. micrantha. 



Petals conspicuous. 



Leaves all entire; pedicels clustered at the end of 



the stem 3. D. coloradensis. 



Leaves toothed; fruit in an elongated raceme 4. D. cuneifolia. 



Perennials, or occasionally biennials, sometimes flowering the 

 first year; style conspicuous, 1 mm. long or more. 

 Basal leaves long-ciliate, the hairs simple or nearly so. 



Stems pubescent; cauline leaves pubescent on both 



surfaces 5. D. slreptocarpn. 



Stems glabrous; cauline leaves glabrous on the faces, 



usually ciliate C. D. tonsa. 



Basal leaves not long-ciliate; hairs branched. 



Petals white 7. D. cana. 



Petals bright yellow. 



Stems equally leafy throughout, the cauline leaves 

 larger than the basal ones. (Plants large, 

 usually 20 cm. high or more). 



Stems solitary, simple below 9. D. helleriana. 



Stems clustered, usually branched below 10. D. patens. 



Stems with reduced leaves or almost naked; basal 

 leaves much larger and more conspicuous 

 than the cauline ones. 

 Basal leaves oblanceolate or obovate, 15 to 25 



mm. wide, toothed; stems almost naked. .11. D. mogoUonica. 

 Basal leaves oblanceolate or narrower, less than 

 5 mm. wide, entire; stems with more 

 numerous leaves. 

 Roots slender; stems finely stellate-pubes- 

 cent 8. D. neomexicana. 



Roots thick and woody; stems long-pubes- 

 cent or glabrous. 

 Leaves glabrous or nearly so, acute or 



acutish; stems glabrous, slender. 13. D. gilgiana. 

 Leaves all pu})escent and ciliate, obtuse; 



stems pubescent, stout 12. D. petrophila. 



1. Draba montana S. Wats. Proe. Amer. Acad. 14: 289. lS7i). 

 Type locality: South Park, Colorado. 



Range: Colorado and New Mexico. 



New Mexico: Rio Pueblo ( Wooton). Mountains, in the Canadian Zone. 



2. Draba micrantha Nutt.; Torr. & Gray, Fl. N. Amer. 1: 109. 1838. 

 Drahd caroliniana micrantha A. Gray, Man. ed. 5. 72. 1867. 



Type locality: Open plains and rocky places about St. Louis, Miasouri, and in 

 Arkansas. 



Range: Washington and IlUnois to New Mexico and Texas. 



New Mexico: Nutritas Creek below Tierra Amarilla (EggJeston 6495). Open 

 slopes, in the Upper Sonora.i and lower parts of the Transition Zone. 



