10. Draba Brachycàrpa Nutt. Short-Fruited Whitlow-Grass

Fig. 2006

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.

Dry hills and fields. Virginia to Illinois, Missouri, Kansas, Georgia, Louisiana and Arkansas. Montana to Oregon. March-May.

11. Draba Nemoròsa L. Wood Whitlow-Grass

Fig. 2007

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.

Western Ontario, Michigan, Minnesota, South Dakota and western Nebraska to Oregon, arctic America and south in the Rocky Mountains to Colorado and Utah. Also in northern Europe and Asia. Summer.

12. Draba Àurea Vahl. Golden Whitlow-Grass

Fig. 2008

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.

13. Draba Alpina L. Alpine Whitlow-Grass

Fig. 2000

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 crassifòlia 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.