crucafekae (^mustard family^ 



421 



Artificial Key to Genera 



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



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 verv flat and thin 



6. 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) otherv/ise. 

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



base 



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

 Stem-leaves petiolate, toothed or pinnate. 



Leaves bipinnatifid 



Leaves simple or pinnatifid. 

 Pods awl-shaped, tapering, closel}' appressed 

 Pods lineai', cylindrical or compressed. 



Pods (when ripe) "2-5 cm. long 



Pods (when ripe) T-9 cm. long 



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

 at the base) c. 



c. Peduncles 1-flowered, radical 



c. Peduncles several-flowered, not radical d. 



d. Dwarf aquatic with awl-shaped entire leaves 



d. Otherwise e. 



e. Fruit transversely 2-celled; plant fleshy 



^ e. Fruit longitudinally 2-celled /. 

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



g. Pods compressed contrary to a narrow jjartition. 



Carpels thickish, tuberculate-crested or dee[ily wrinkled 

 Carpels compressed, smoothish. 

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



branched 



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



Seeds several in each cell 



Seeds solitary in each cell 



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



Pods 2-3 cm. broad . 



Pods narrower. 



Hairs none or all simple 



Hairs at least in part branched or attachec' by the middle. 

 Hairs vertically 2-forked, appressed, apparently attached 



by the middle 



Hairs otherwise. 

 Seeds 2 in each cell ; J»ods orbicular .... 

 Seeds several to many in each cell. 

 Petals deeply bifid. 



Scapose, 1dm. or less high 



Leafy-stemmed, 3-S dm. high .... 



Petals nearly or quite entire 



f. Pods 4-00 times as long as wide h. 

 h. Hairs simple or none. 



Leaves palinately divided 



Leaves otherwise. 



Fruit thickish, 4-7 ram. in diameter 



Fruit slender. 1-3 mm. in diameter. 

 Petals |)ur|)le or rose-colored. 

 Lateral sejials with a hump (often tufted) just below 



the sniniiiit 



Lateral sepals unappendaged . • . . . 



6. LKsglERELLA 



12. Nesi.ia. 

 11. Caweli.va. 



4. Alv8si:,m. 

 1. Dkaba. 



23. Kadicula. 

 25. Sele.nia. 



14. Kaimiancs. 



16. DlPLOTAXlS. 



15. Brassita. 



19. SlSV.MBRIUM 



22. Erysimum. 



31. Akabis. 

 17. (joniunuia. 



19. Slsvmbkium. 

 19. Sisymbrium. 



24. Bakbauea. 



19. SiSYMWtll'K 



28. Leavenwob?hi 

 9. subularia. 

 18. Cakilk. 



8. CORONOPUS. 



10. Capsklla. 



6. TlILASPl. 



7. Lepidium. 



27. Lcnaria. 



28. Radicula. 



8. Lobularia 

 4. Alyssum. 



1. I>UAUA. 



2. Bkkteroa. 

 1. Draba. 



28. Dbntaria. 

 14. Raphani-h 



26. loDAirrnuR 

 80. Cardamink. 



