256 PROCEEDINGS OP THE AMERICAN ACADEMY 



numerous short branches of the caudex forming a broad mat, scapose, 

 finely stellate-pubescent : leaves very small, oblong, obtuse, not ciliate : 



§ 2. Heterodraba. Pedicels reflexed to one side. Seeds hispidulous. — 

 A stellate-pubescent short-caulescent and branching winter-annual, with coarsely 

 toothed or entire leaves, white flowers and round-oval 8-12-seeded pods. Hetero- 

 draba, Greene, Bull. Calif. Acad. 1. 72. 



2. D. unilateralis, Jones. Branches elongated, lax : leaves cuneate-obo- 

 vate to oblanceolate : racemes usually nearly sessile : flowers very small : pods 

 somewhat twisted, on short pedicels. — Torr. Bull. 9. 124. Colusa County, 

 California, to Lower California. 



§ 3. Drabella, DC. Stellate-pubescent or more or less villous short- 

 caulescent and more or less leafy winter-annuals (scapose and rarely biennial 

 in n. 12), with ascending or spreading pedicels, entire or emarginate petals and 

 smooth seeds. 



* Early spring species of valleys and hillsides, or southern. 



-t- Leaves entire : flowers small, white : pedicels clustered or approximate. 



3. D. Caroliniana, Walt. Branches often decumbent, the peduncles scape- 

 like : leaves loosely stellate-pubescent : pods linear, glabrous. — New England to 

 Minnesota, Arkansas and Georgia ; Umatifla, Oregon. 



Var. micrantha, Gray. Pods subappressed-hispid. — Illinois to Texas, New 

 Mexico and Washington Territory. 

 ■t- ■*- Leaves coarsely few-toothed or entire : pedicels more remotely racemose. 

 ++ Flowers small, white : stigma sessile or nearly so. 



4. D. cuneifolia, Nutt. Loosely stellate-pubescent : leaves cuneate-obo- 

 vate to oblanceolate : raceme pedunculate : pods linear-oblong, usually acutish, 

 shortly subappressed-hispid, lG-50-seeded. — D.filicauds, Scheele, Linnsea, 21. 

 583. Kentucky to Alabama and west to southern California. 



Var. integrifolia. Small (1 or 2 inches high) with small and mostly entire 

 leaves, and glabrous pods on pedicels about a line long. — Coast Ranges of 

 southern California. 



Var. platycarpa. Pods oblong-oval, usually obtuse. — D. platycarpa, Torr. 

 & Gray, Fl. 1. 108. D. Rcemeriana, Scheele, 1. c. Texas to Arizona. Differ- 

 ing only in the form of the pods. 



5. D. Sonor<e, Greene. Racemes usually nearly sessile and flowers very 

 small : pods finely stellate-pubescent, narrowly oblong, lG-20-seeded, on short 

 pedicels. — Bull. Calif. Acad. 2. 59. Southern California and Arizona to Sonora. 

 The pubescence of the pods is the most constant character distinguishing this 

 species from the last. 



6. D. brachycarpa, Nutt. Stellate pubescence somewhat appressed : leaves 

 ovate to ovate-oblong, the cauline oblong-lanceolate or linear : peduncles short : 

 flowers very small : pods narrowly oblong, glabrous, 1 or 2 lines long, 10-12- 

 seeded. — Virginia to Georgia, Louisiana and Missouri ; Roseberg, Oregon. 



++ ++ Flowers yellow, large : style slender. 



7. D. Mogollonica, Greene. A span high, villous or loosely stellate-pubescent 

 below : leaves mostly basal, oblanceolate, stellate-pubescent : pods linear or ob- 

 long, glabrous, 4 to 8 lines long. — Coult. Bot. Gaz. 6. 157. Mountains of New 

 Mexico (Rusby, Greene). 



