CKUCIFERAE (MUSTARD FAMILY) 



421 



5. LESQUERELLA. 

 12. NEBLIA. 

 11. CAMELINA. 



4. AI.YSSUM. 

 1. DRABA. 



23. EADICULA. 

 25. SELENIA. 



14. EAPIIANUS. 

 1C. DIPLOTAXIS. 



15. BRASSICA. 



19. SlSYMBRIUM 



22. ERYSIMUM. 



31. ARABIS. 

 17. OONRINGIA. 



19. SlSYMBRICM. 

 19. SlSYMBRIUM. 



24. BARBAREA. 



19. SlSYMBRIUM. 



ARTIFICIAL KEY TO GENERA 



a. Petals present, with yellow blade and yellowish or whitish claw b. 

 b. Fruit short, not more than 3 times as long as broad. 

 Pubescence stellate. 

 Pods thick. 

 Pods globose. 



Pods dehiscent 



Pods indehiscent 



Pods obovoid 



Pods thin. 



Pods orbicular 



Pods oblong 



Pubescence simple or none. 



Pods subglobose or cylindrical 



Pods very flat and thin 



b. Fruit much more than 3 times as long as broad. 



Pods 1-celled or with spongy cross partitions 



Pods longitudinally 2-celled. 



Seeds 2-rowed in each cell 



Seeds 1-rowed in each cell. 

 Petals 7-15 mm. long. 



Pods thickish, 2-6 mm. in diameter 



Pods linear, about 1 mm. in diameter 



Petals smaller. 



Stem-hairs vertical, attached by the middle, appressed . 

 Stem-hairs (if present) otherwise. 

 Stem-leaves lanceolate, sessile, subentire ; stem villous at 



base 



Stem-leaves elliptical, sessile, entire ; stem glabrous . 

 Stem-leaves petiolate, toothed or pinnate. 



Leaves bipinnatifid 



Leaves simple or pinnatifid. 

 Pods awl-shaped, tapering, closely appressed 

 Pods linear, cylindrical or compressed. 



Pods (when ripe) 2-5 cm. long 



Pods (when ripe) 7-9 cm. long 



Petals (when present) with blade white or purplish (sometimes yellow 

 at the base) c. 



c. Peduncles 1-flowered, radical 



c. Poduncles several-flowered, not radical d. 



d. Dwarf aquatic with awl-shaped entire leaves 



il. Otherwise e. 



e. Fruit transversely 2-celled ; plant fleshy 



e. Fruit longitudinally 2-celled /. 

 /. Pods short, rarely 3 times as long as wide g. 

 ff. Pods compressed contrary to a narrow partition. 



Carpels thickish, tuberculate-crested or deeply wrinkled . 8. CORONOPUS. 

 Carpels compressed, smoothish. 

 Pods wedge-shaped at the base ; some or all of the hairs 



branched 10. CAPSELLA. 



Pods not wedge-shaped at the base ; hairs simple or none. 



Seeds several in each cell 6. THLASPI. 



Seeds solitary in each cell 7. LEPIDICM. 



g. Pods compressed (if at all) parallel to the broadish partition. 



Pods 2-3 cm. broad .27. LUNARIA. 



Pods narrower. 



Hairs none or all simple 23. EADICULA. 



Hairs at least in part branched or attached by the middle. 

 Hairs vertically 2-forked, appressed, apparently attached 



by the middle 3. LOBULARIA. 



Hairs otherwise. 



Seeds 2 in each cell ; pods orbicular .... 4. ALYSSUM. 

 Seeds several to many in each cell. 

 Petals deeply bifid. 



Scapose, 1 dm. or less high 1. DRABA. 



Leafy-stemmed, 3-8 dm. high . . . .2. BERTEROA. 



Petals nearly or quite entire 1. DRABA. 



Is 4-co times as long as wide h. 

 Hairs simple or none. 



Leaves palmately divided 29. DENTARIA. 



Leaves otherwise. 



Fruit thickish, 4-7 mm. in diameter 14. EAPHANUS. 



Fruit slender, 1-3 mm. in diameter. 

 Petals purple or rose-colored. 

 Lateral sepals with a hump (often tufted) just below 



the summit 26. IODANTHUS. 



Lateral sepals uuappendaged 30. CARDAMINK. 



28. LEAVENWORTHIA. 



9. SUBULARIA. 



18. CAKILE. 



