294 BRASSICACEAE 



the slender scape-like peduncles; pedicels ascending, shorter than or about equaling the pods; 

 pods 6-12 mm. long, Z-A mm. wide, glabrous. 



Dry hillsides and plains. Arid Transition ar.d Upper Sonoran Zones; eastern Washington and Oregon to 

 Colorado, Ontario, and the Atlantic States. March-May. 



Draba reptans var. micrantha (Nutt.) Fernald, Rhodora 36: 368. 1934. Pods hispid with short simple 

 hairs. Eastern Washington to southern California, Illinois, and Louisiana. 



Draba reptans subsp. stellifera (O. E. Schulz) Abrams. {Draba caroliniana var. micrantha i stellifera 

 O E Schulz Pflanzenreich 4 105 : 333. 1927. D. caroliniana subsp. stellifera Payson & St. John, i'roc. Biol. 

 Soc Wash 43- 103. 1930.) This subspecies differs from the species in the densely stellate upper surfaces of 

 the 'leaves and in the hispidulous pods. Dry rocky or sandy slopes, eastern Washington to Idaho and the 

 desert ranges, southern California. 



3. Draba platycarpa Nutt. Broad-podded Whitlow-grass. Fig. 2067. 



Draba platycarpa Nutt. in Torr. & Gray, Fl. N. Amer. 1 : 108. 1838. 



Draba Roemeriana Scheele, Linnaea 21: 256. 1888. 



Draba viperensis St. John, Proc. Biol. Soc. Wash. 43: 104. 1930. 



Annual, branching from the base, the stems 15-25 cm. high, pilose with simple and stellate 

 hairs. Basal leaves oblanceolate, 15-25 mm. long, entire or few-toothed, obtuse at the apex 

 stellate-pubescent above; stem leaves lanceolate to narrowly ovate; racemes becoming lax and 

 elongated in fruit, 10-15 cm. long; petals white, 3 mm. long; fruiting pedicels divergent, 3 T 8 mm. 

 long; pod elliptic to obovate, strongly compressed, 6-8 mm. long, rounded at apex, hispidulous 

 with upwardly appressed hairs. 



Open ground and rocky hillsides, Sonoran Zones; eastern Washington, eastern Oregon, and Idaho, to 

 Arizona and Texas. Type locality : Texas. April-May. 



4. Draba sondrae Greene. Sonora Draba. Fig. 2068. 



Draba sonorae Greene, Bull. Calif. Acad. 2: 59. 1886. 



Draba cuneifolia var. sonorae Parish, Bull. S. Calif. Acad. 2: 81. 1903. 



Low winter annual, the stems erect or ascending, branching near the base, leafy below, 8-15 

 cm. high. Basal leaves obovate to oblanceolate, cuneate at base, 10-20 mm. long, entire or few- 

 toothed, stellate on both surfaces ; petals white, 2 mm. long ; fruiting racemes 3-10 cm. long ; 

 pedicels spreading, 3-4 mm. long; pods oblong-elliptical, 6-9 mm. long, 2.5 mm. wide, stellate. 



Sandy or gravelly soil, Sonoran Zones; southern California to Arizona, Lower California, and Sonora. 

 Type locality: northwestern Sonora. Feb.-May. 



Draba sonorae var. integrifolia (S. Wats.) O. E. Schulz, Pflanzenreich 4™ 5 : 336. 1927. Closely resem- 

 bling the typical species, but the pods nearly or quite glabrous. Southern California. 



5. Draba brachycarpa Nutt. Short-fruited Whitlow-grass. Fig. 2069. 



Draba brachycarpa Nutt. in Torr. & Gray, Fl. N. Amer. 1: 108. 1838. 



Low tufted annual, 5-12 cm. high, leafy to the inflorescence and loosely stellate-pubescent. 

 Basal leaves ovate or obovate, 8-12 mm. long, obtuse, entire or sparingly denticulate ; stem leaves 

 smaller, sessile, entire ; sepals somewhat shorter than the petals ; petals yellow or whitish, 2 mm. 

 long, sometimes wanting; fruiting pedicels ascending, 2-4 mm. long; pods oblong, acute, 3-4 

 mm. long, 1 mm. wide ; style minute. 



Dry hills and fields, Transition and Upper Sonoran Zones; Oregon, Montana, and Colorado to Illinois, 

 Virginia, Georgia, and Arkansas. Type locality: plains and open places, near St. Louis. March-May. 



6. Draba nemorosa L. Wood Whitlow-grass. Fig. 2070. 



Draba nemorosa L. Sp. PI. 643. 1753. 



Loosely stellate-pubescent winter annual, 15-30 cm. high, branching below, leafy to the in- 

 florescence. Leaves oblong-ovate or lanceolate, sessile, obtuse, dentate, the lower 20-25 mm. 

 long, the upper smaller ; petals light yellow, 2-3 mm. long ; fruiting pedicels divaricate, 1-2 cm. 

 long ; pods oblong, 5-10 mm. long, 2 mm. wide. 



Woods and thickets, Boreal and Transition Zones; British Columbia to northern California, east to Colo 

 rado, Michigan, and Ontario; also in northern Europe and Asia. Type locality: in Europe. April-June. 



Draba nemorosa var. leiocarpa Lindbl. Linnaea 13: 33. 1839. (D. lutea Gilib.) Pods glabrous. Boreal 

 and Transition Zones; Alaska to eastern Oregon, Hudson Bay, Colorado, and Michigan; also Eurasia. 



7. Draba stenoloba Ledeb. Alaska Whitlow-grass. Fig. 2071. 



Draba stenoloba Ledeb. Fl. Ross. 1: 154. 1841. 

 Draba nitida Greene, PI. Baker. 3: 7. 1901. 



Winter annual, usually branched from the base, 1-3 dm. high. Basal leaves rosulate, ob- 

 lanceolate, 1-3 cm. long, nearly glabrous above, densely stellate beneath ; stem leaves few, oblong 

 or lanceolate, usually entire; petals yellow, about 2 mm. long; fruiting pedicels ascending, 6-15 

 mm. long; pod linear-oblong, 8-15 mm. long, 2 mm. wide, erect, glabrous. 



Boreal Zones; Alaska and Alberta to the Sierra Nevada, California, and Colorado. Type locality: Una- 

 laska. May— Aug. 



8. Draba lonchocarpa Rydb. Lance-podded Draba. Fig. 2072. 



Draba lonchocarpa Rydb. Mem. N.Y. Bot. Gard. 1 : 181. 1900. 



Draba nivalis var. elongata S. Wats. Proc. Amer. Acad. 23: 258. 1886. 



Cespitose perennial. Basal leaves spatulate, 3-5 mm. long, densely stellate ; stem leaves 1 or 



