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Key to Draba

Brassicaceae

Draba

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(c) Fleming, Gary P.
(c) Ware, Richard & Teresa - CC-BY-NC, permission granted to NCBG
1 Leaves all basal; petals deeply bifid (about 1/2 way to base)
(c) Ware, Richard & Teresa - CC-BY-NC, permission granted to NCBG
1 Leaves basal and cauline (the basal sometimes withering by fruiting); petals merely emarginate.
(c) Krakowiak, Alaina - CC-BY
  2 Silique twisted; petals 5-6 mm long; styles conspicuous, 1.5-3 mm long; perennial from a caudex; flowers all chasmogamous, with anthers 0.5-0.6 mm long, and with petals; [on calcareous rock outcrops]
  2 Silique not twisted; petals 0-5 mm long; styles absent to inconspicuous, 0-0.25 mm long; winter-annuals; flowers of two types, the early ones chasmogamous, with anthers 0.2-0.4 mm long, and with petals, the later ones cleistogamous, with anthers ca. 0.05 mm long, and lacking petals; [mostly in open situations in sandy or clayey soils, sometimes on rocks, including limestone].
(c) Fleming, Gary P.
    3 Silique 1-6 mm long; leaves extending upward into the lower branches of the inflorescence; trichomes exclusively cruciform
(c) Cressler, Alan M.
    3 Silique 8-14 mm long; leaves low-cauline, not extending upward into the lower branches of the inflorescence; trichomes of 2 types, simple and 2-7-rayed