VOL. II.] 



MUSTARD FAMILY. 



109 



Valves of the silique nerveless. 



Seeds winged; stem scape-like; flowers few. 22. Leavenworthia. 



Seeds wingless; valves of the silique elasticallj- dehiscent. 



Stems leafy below or throughout. 18. Cardamine. 



Stems leafless below, 2-4-leaved above. 19. Dentaria. 



Valves of the silique i -nerved or veiny, not elasticalty dehiscent. 32. Arabis. 

 b. Silique produced into a beak beyond the valves. 

 Beak conic, very short in no. 13. 



Silique terete; seeds in i row. 12. Brassica. 



Silique flat; seeds in 2 rows. 13. Diplotaxis. 



Beak flat, sword-shaped. n. Sinapis. 



3. Silique elliptic or oblong, very flat, 2-3 times as long as broad, clearly stipitate. 



Flowers violet; funiculus of the seed adnate to the septum of the pod. 20. Lunaria. 

 Flowers yellow; funiculus of the seed free from the septum. 21. Selenia. 



1 1 Pd an orbicular globose or oblong silicle, or but little more than twice as long as wide (except 



in some species of no. 29). 

 1 . Silicle globose, or flattened parallel with the septum. 



a. Plants terrestrial, or not strictly aquatic. 



+ Silicle globose, or terete-oblong, little or not at all compressed. 

 Plants not maritime. 

 Petals not 2-cleft. 



Seeds minute, round, not flattened, in 2 rows in each cell. 17. Roripa. 

 Seeds flat; silicle inflated; plants stellate-pubescent, 24. Lesquerella. 



Petals 2-cleft. 36. Berteroa. 



Plants maritime, fleshy, northern. 7. Cochlearia. 



H- Silicle didymous, its cells globose-inflated. 23. Physaria. 



+++ Silicle compressed or flat, many-seeded. 29. Draba. 



2-8-seeded. 



Flowers yellow. 34. Alyssum. 



Flowers white. t 35. Koniga. 



++++ Silicle pear-shaped, or obovoid, many-seeded. 27. Camelina. 



b. Wholly submersed small aquatic; silicle globose or oblong. 3. Subularia. 

 . Silicle flattened at right angles to the narrow septum. 



Seeds several in each cell of the silicle. 



Silicle triangular, obcuneate. 26. Bursa. 



Silicle elliptic, wingless, its valves with a strong midvein. 25. Hutchinsia. 



Silicle oblong or orbicular, winged all around. 6. Thlaspi. 



Seeds solitary in each cell, compressed. 4. Lepidium. 



": -X- Pod indehiscent, short or elongated. 



Pod broader than long, more or less didymous. 5. Coronopus. 



Pod globose, reticulated. 28. Neslia. 



Pod elongated. 



Pod of 2 joints, separating at maturity; plants maritime. 10. Cakile. 



Pod constricted between the seeds, not jointed, beaked. 14. Raphanus. 



i. STANLEYA Nutt. Gen. 2: 71. 1818. 



Glabrous and glaucous, perennial tall mostly erect and branching herbs, with entire 

 toothed lobed or pinnately divided leaves, and large yellow bractless flowers in elongated 

 terminal racemes. Sepals linear, narrow. Petals narrow, long-clawed. Stamens 6, very 

 nearly equal; anthers twisted. Ovary short-stipitate; style short or none. Siliques linear, 

 long-stipitate, spreading or recurving, somewhat compressed, dehiscent, the valves with a 

 strong midnerve. Seeds in i row in each cell, numerous, pendulous. Cotyledons straight, 

 incumbent. [Named for Lord Edward Stanley, 

 President of the Linnaean Society.] 



About 3 species, of western North America. 



i. Stanleya pinnata (Pursh) Britton. 

 Stanley a. (Fig. 1681.) 



Cleome pinnata Pursh, Fl. Am. Sept. 739. 1814. 

 Stanleya pinnatifida Nutt. Gen. 2: 71. 1818. 

 Stanleya pinnata Britton, Trans. N. Y. Acad. 



Sci. 8: 62. 1888. 



Stems stout, 2-5 tall, sometimes decum- 

 bent. Lower leaves pinnatifid or pinnately 

 divided, or entire, s'-S 1 ' long, 1'-$' wide, long- 

 petioled; upper leaves similar, or less divided, 

 or narrowly oblong or lanceolate, entire, short- 

 petioled and narrowed at the base; flowers nu- 

 merous, showy; petals 8 // -i2 // long; filaments 

 filiform, exserted; siliques 2 / ~3 / long, about i" 

 thick, 2-3 times as long as their stipes, 

 spreading, downwardly curved, somewhat 

 constricted between the seeds when dry. 



In dry soil, South Dakota and Nebraska to Cali- 

 fornia, New Mexico and Arizona. Plant with the 

 aspect of a Cleome. May-July. 



