June, 191 7J The Brassicacece of Ohio 311 



5. Leaves entire. 6. 



5. Leaves dentate, cordate; flowers purple. Lunaria. 



6. Sepals persistent; petals yellow. Alyssum. 

 G. Sepals deciduous; petals white. 7. 



7. Pods elliptic, canescent; petals bifid. Berteroa. 



7. Pods orbicular, glabrous; petals entire. Koniga. 



8. Pods dehiscent; flowers white. 9. 



S. Pods indehisccnt; flowers yellow; leaves large. Myagriim. 



9. Pods triangular; basal leaves tufted. Bursa. 



9. Pods didymous, rugose; leaves pinnatifid. Carara. 



9. Pods orbicular. 10. 



10. Pods broadly winged, several seeded; leaves dentate. Thlaspi. 



10. Pods scale-shaped, smooth; leaves pinnatifid to entire. Lepidium. 



11. Pods dehiscent; plant usually glabrous. 12. 



1 1 . Pods indehiscent, reticulated; plant hispid; leaves lanceolate, sagittate. Neslia 



12. Pods pear-shaped; flowers j'cllow; leaves lanceolate. Camelina. 



12. Pods globose or ovoid; flowers white. 13. 



13. Leaves various; root pungent; pods seldom formed. Armoracia. 



13. Leaves immersed, dissected, and emersed. Neobeckia. 



14. Pods dehiscent. 15. 



14. Pods indehiscent, beaked. 32. 



15. Pods tipped with the style or style none. 16. 



15. Pods beaked; flowers yellow. 30. 



16. Seeds in two rows in each cavit^^ 17. 



16. Seeds in one row in each cavity. 20. 



17. Glabrous, aquatic; leaflets 3-11; flowers white. Sisymhrium. 



17. Pubescent or glabrous. 18. 



IS. Leaves simple, not lobed; basal leaves tufted; flowers purplish. Arabis. 



18. Leaves pinnatifid or bi-pinnatifid; flowers yellow. 19. 



19. Plants of wet places; valves nerveless. Radicula. 



19. Plants of dry places; valves 1-3-nerved. Sophia. 



20. Leaves simple, not lobed. 21. 



20. Leaves lobed or pinnatifid. 26. 



21. Leaves entire, obtuse, cordate; plants glabrous, pale green; fiowers pale 



yellow. Conringia. 



21. Leaves not entire. 22. 



22. Leaves ovate or cordate; plants glabrous or nearly so; pods long, slightly 



constricted between the seeds. 23. 



22. Leaves lanceolate or oblanceolate; plants pubescent. 24. 



23. Leaves broad, dentate, cordate; flowers white. Alliaria. 



23. Leaves sometimes lyrate; flowers purple. lodanthus. 



24. Stems nearly leafless, slender; flowers white. Arabidopsis. 



24. Stems leafy. 25. 



25. Stems branching, rough-pubescent or hoary; flowers yellow. Cheirinia. 



25. Stems simple or nearly so; flowers large, purple, fragrant. Hesperis. 



26. Leaves palmately 3-lo'bed; stems leafless below; rootstocks pungent. Dentaria. 

 26. Leaves pinnately lobed. 27. 



26. Basal and stem-leaves different. 29. 



27. Leaves rtmcinate-pinnatifid. 28. 



27. Leaves h'rate; pods and stems 4-angled, glabrous. Barbarea. 



28. Pods appressed, 3^ in. long. Erysimum. 



28. Pods spreading, 2-4 in. long. Norta. 



29. Pods elastically dehiscent. Cardamine. 



29. Pods not elastically dehiscent. Arabis. 



30. Pods constricted; beaks long and flat. Sinapis. 



30. Pods not constricted. 31. 



31. Pods round; beak conic; seeds in one row% globose; basal leaves pinnatifid. 



Brassica. 



'.)\. Pods flattened; beak short; seeds in two rows, ovoid; all leaves deeply pin- 

 natifid. Diplotaxis. 



32. Pods constricted, spongy; leaves lyrate; flowers yellow or purple. Raphanus. 

 32. Pods 2-jointed; flowers purple; fleshy seaside plants. Cakile. 



