. (MUSTAUD FAMILY.) 29 



2. S. alba. L. (\VIIITK MI:STAI:I>.) S ill [lies hispi. I, on spreading pedi- 

 cels, s.arcely as long us the sword .-ha ped l.e.ik; seed pale brown. With 

 ti.e preceding. 



.'3. S. arvensis, L. (('IIMU.OCR.) Siliqiies smooth, angular, knotted, 

 spreading thrice as long as the hedged beak; seed black. Around 

 homesteads. 



13. DRABA, L. 



Silicle oblong or oval, flattened parallel with the broad partition. Seeds 

 numerous in two rows in each cell, compressed, wingless. Cotyledons accum- 

 bent. Small herbs with entire or toothed leaves, and yellow or white flowers 



in terminal racemes. 



1. DRABA. Petals entire. 



1. D. brachycarpa, Nutt. Annual; minutely downy; stems leafy, 

 simple or branched; radical leaves round-ovate, stalked, those of the stem 

 oblong-linear ; silicic oval, as long as the pedicel. Middle districts of Georgia, 

 in dry soil, and westward. March- April. Stem 2' -6' high. Silicle 2"- 

 3" long. Flowers white. 



2. D. Caroliniana, Walt. Annual ; stems leafy and hispid at the base, 

 smooth above; leaves tufted, spatulate-obovate, hispid ; silicle linear oblong, 

 two or three times as long as the pedicel. Dry sterile soil. Feb. -April. 

 Steins l'-3' high. Silicle 4"- 6" long. Flowers white. 



3. D. cuneifolia, Nutt. Annual; leaves obovate, wedge-shaped, or the 



lowest spatulate, toothed; raceme somewhat elongated in fruit (l'-3'), at 

 length equalling the naked peduncle ; petals emarginate, much longer thau 

 the calyx ; silicles oblong-linear, minutely hairy, longer than the horizontal 

 pedicels. West Florida (Xuttull), and westward. March -April. 



4. D. ramosissima, Desv. Perennial ; stems diffuse, pubescent ; leaves 

 linear-lanceolate or the lowest oblanceolate and crowded, coarsely toothed ; 

 racemes corymbose-branched; silicic- lanceolate, flat, twisted, hairy; style 

 slender. Mountains of North Carolina. April - May. Stems 4'- 8' long. 

 Flowers white. 



2. EROPHILA. Petnk 1-deft. 



5 D. verna, L. Stems naked, slender (2' -4' high) ; leaves radical, ob- 

 long; silicles oblong, smooth, shorter than the pedicels, scattered; flowers 

 small, white. Waste places, chiefly in the upper districts. Introduced. (T). 



14. LESQUERELLA, WATSON. 



Silicle globular, or flattened parallel to the orbicular partition, the valves 

 nerveless. Seeds few, flat. Cotyledons accumhent. Filaments toothless. - 

 Low herbs, pubescent or hoary with stellate hairs. Racemes many-flowered. 

 Flowers yellow. 



1. L. Lescurii, Watson. Biennial, pubescent ; stems clustered, | high ; 

 leaves oval or ohlong, \' long, toothed, half clasping by the sagittate base, 

 the lowest narrowed in a petiole ; style half as long as the flattened hispid 

 2-8-seeded silicle; seed wing-margined. Hills near Nashville, Tennessee. 

 April -May. 



