The Flora of the Cayuga Lake Basin 223 



c. Pods turgid. 



d. Leaves entire or obscurely toothed, sagittate ; pubescence stellate. 

 e. Fruit globose; wrinkled, indehiscent, 2.5 mm. in diam. [Neslia] 



e. Fruit obovoid, smooth, dehiscent, 4-5 mm. in diam. 7. Camelina 

 d. Leaves pinnatifid, not sagittate ; fruit globose or oblong, scarcely wrinkled ; 

 pubescence simple. 14 Roripa 



a. Fruit four to many times as long as wide. 

 b. Flowers yellow or cream yellow. 

 c. Apex of fruit beyond valves (1.5) 2 mm. long or more; petals 6-20 mm. long. 

 d. Petals with dark veins. 

 e. Pods indehiscent, moniliform, especially when dry; valves without a mid- 

 rib, not strongly keeled; walls spongy. [Raphanus] 

 e. Pods dehiscent, not moniliform; valves with a strongly keeled midrib; 

 walls not so spongy ; leaves or their divisions narrower than in the 

 preceding, more fleshy and more nearly glabrous. [Eruca] 

 d. Petals without dark veins ; pods dehiscent, thin-walled, moniliform or un- 

 constricted. 

 e. Racemes bractless. 

 /. Apex of fruit beyond the valves more than 4 mm. long, or if shorter 



the leaves thin and often hairy, with dentate lobes. 8. Brassica 

 /. Apex of fruit less than 4 mm. long ; leaves semi-succulent, glabrous, 

 with entire or crenate lobes. 17. Bare-area 



e. Racemes leafy-bracted; leaves pinnatifid, with obtuse lobes. 



9. Eruca strum 

 c. Apex of fruit beyond valves 1 mm. long or less ; petals 3-10 mm. long. 

 d. Leaves entire or obscurely dentate (see also Arabis). 



e. Leaves oval-oblong, clasping. 10. Conringia 



e. Leaves linear-lanceolate, not clasping. 13. Erysimum 



d. Leaves pinnatifid. 



e. Leaves waxy in texture, shining, glabrous, shallowly crenate ; terminal 



lobe usually obtuse. 17. Bare-area 



e. Leaves usually thin and veiny, more sharply toothed ; terminal lobe more 

 commonly acute. 

 /. Fruiting pedicels thick; valves of the pod with 1-3 ribs. 



11. Sisymbrium 

 /. Fruiting pedicels slender; valves of the pod veinless. 14. Roripa 

 b. Flowers pure white or purple, rarely greenish or yellowish white. 

 c. Fruit indehiscent, thick and fleshy, beaked; leaves pinnatifid. [Raphanus] 

 c. Fruit dehiscent, not fleshy, beaked or beakless ; leaves divided, dentate, or 

 entire. 

 d. Leaves palmately divided and cleft. 19. Dentaria 



d. Leaves pinnatifid or undivided. 

 e. Petals 15-20 mm. long, purple or rarely white; leaves ovate-lanceolate, 



9-15 cm. long, sharply denticulate; plants tall. 12. Hesperis 



e. Petals 14 mm. long or less, white or purple-tinged ; leaves diverse ; plants 

 tall or low. 

 /. Leaves slightly fleshy, glabrous, obtuse, often crenate, not sagittate. 

 g. Pods spreading, curved, terete or nearly so; leaves pinnatifid. 



15. Nasturtium 

 g. Pods erect or ascending, straight, flattened; leaves pinnatifid or oval- 

 oblong and undivided. 20. Cardamine 

 /. Leaves thin or slightly fleshy, glabrous or hairy, acute or obtusish, 

 entire, serrate or the basal ones subcrenate, sagittate or not sagittate. 

 g. Pods more than 1.5 cm. long. 21. Arabis 

 g. Pods less than 1.5 cm. long. 11. Sisymbrium 



