336 



CRUCIFERAE 



13. Radicula. 



14. Sisymbrium. 

 24. Sophia. 



4. Alliaria. 



4. Fumaria L. 



I. F. officinalis L. In waste places and on ballast: N. S. to 



Fla. and the Gulf States; locally in the interior. Adventive 



from Europe. 



An uncommon adventive near the towns and cities. 



F. capreolata L. and F. parviflora Lam. have been recorded as ballast weeds near 

 New York. 



CRUCIFERAE 



A. Pod a silique or silicle. dehiscent into 2 valves to the base. 

 I. Pod an elongated linear silique, at least twice as long as 

 wide. 

 Silique tipped with a short slender style, or without a 

 style. 

 Seeds globose or oblong, wingless. 

 Seeds in 2 rows in each cell. 



Pubescence, if any, of simple hairs. 

 Flowers yellow. 

 Flowers white. 

 Pubescence of forked hairs. 

 Seeds in only 1 row in each cell. 



Leaves reniform or cordate; flowers white. 

 Leaves not reniform or cordate' flowers 

 yellow (except in No. 28). 

 Leaves dentate, dissected, or pinna- 

 tifid. 

 Hairs simple. 



Pods narrowly conic, ribbed. 

 Pods linear-cylindric. 

 Hairs forked. 

 Leaves entire or slightly toothed. 

 Flowers white or pink. 



Valves of the silique nerved. 

 Valves of the silique nerve- 

 less. 

 Flowers yellow. 



Flowers large, purple or purplish- 

 white. 

 Seed flat, wingless or winged. 



Siliques 4-angled, the valves keeled; flowers 



yellow. 

 Siliques flat or flattish. 



Valves of the silique nerveless. 



Stem leafy below or throughout. 

 Stem leafless below, 2-4 leaved above. 

 Valves of the silique 1 -nerved or veiny. 

 Silique produced into a beak beyond the valves. 

 Beak conic, very short in No. 8. 



5. Erysimum. 



6. NORTA. 



24. Sophia. 



32. conringia. 



25. Stenophragma. 

 27. Cheirinia 



31. Hesperis. 



12. Barbarea 



17. Cardamine 



18. Dentaria. 

 26. Arabis 



