This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol2", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
Draba brachycarpa Nutt.; T. & G. Fl. N. A. 1: 108. 1838.
Annual, tufted, 2-5' high, loosely stellate-pubescent, leafy to the inflorescence. Basal leaves ovate or obovate, 4"-6" long, obtuse, sparingly dentate or entire; stem-leaves smaller, sessile, oblong, entire; pedicels ascending, 1"-2" long in fruit; raceme elongating; flowers yellow, 1" broad; petals somewhat longer than the calyx, sometimes wanting; pods oblong, acute, 1V-2" long, \" broad; style minute.
Draba nemorosa L. Sp. Pl. 643. 1753.
Winter-annual, loosely stellate-pubescent, 6'-12' high, branching below, leafy to the inflorescence. Leaves oblong-ovate, or lanceolate, obtuse, sessile, dentate, the lower io"-I2" long, 5"-7" wide, the upper smaller; flowers yellow, fading to whitish, 1" broad; petals notched, slightly exceeding the calyx; pedicels divaricately spreading in fruit, glabrous, 3"-10" long; racemes open, much elongating; pods pubescent, or glabrous, oblong, obtuse, 3"-4" long; style none.
D. aurea Vahl in Hornem. Fl. OEcon. Ed. 2, 599. 1806.
Perennial, pubescent throughout with stellate and simple hairs; stem branching or nearly simple, 6'-10' high, leafy to the inflorescence. Basal leaves oblan-ceolate or spatulate, 6"-12" long, obtuse or acutish, slightly dentate or entire, often ciliate at the base; stem-leaves oblong or lanceolate, acute; pods lanceolate or oblong-lanceolate, 4"-6" long; flowers yellow, 2" broad; petals twice the length of the calyx, emar-ginate or entire; pods acute, pubescent or rarely glabrous, at length slightly twisted, 4"-7" long, on erect pedicels one-half their length; style stout, J" long.
Mignon Island, Gulf of St. Lawrence to Labrador, Greenland; arctic America and in the Rocky Mountains south to Arizona. Summer.
Draba alpina L. Sp. Pl. 642. 1753.
Perennial by a branched caudex, densely tufted, scapes pubescent, 1/2'-6' high. Leaves all basal, entire or few-toothed, oblong, or oblong-lanceolate, obtuse or acute at the apex, mostly narrowed at the base, ciliate, or villous-pubescent, sometimes with some stellate hairs, 2"-6" long, sessile or short-petioled; flowers yellow, about 3" broad; calyx pubescent or villous; style 1/2" long or less; pod oval or ovate, narrowed at both ends, glabrous, or somewhat pubescent, 2 1/2"-4" long, 1"-1 1/4" wide; pedicels ascending, 1"-5" long Greenland to Hudson Bay, the mountains of British Columbia and Alaska. Also in northern Europe and Asia. Summer.
Draba crassif˛lia Graham, a low annual or biennial species, with tufted basal ciliate leaves, small yellowish scapose flowers, of arctic and alpine distribution, ranges south to Labrador.