o 



10 The Ohio Journal of Science [Vol. XVII, No. 8, 



17. Stem-leaves sagittate; pods triangular. Bursa. 



17. vStem-leaves lanceolate, oblong or linear; pods orbicular. Lepidium. 



18. Leaf-segments numerous, end one larger. Cardamine. 



18. Leaf-segments very narrow; stems diffuse. Arahis. 



19. Leaves simple, not lobed, entire, rarely dentate or repand. 20. 



19. Leaves lobed or pinnatifid. 24. 



20. Leaves spatulate or linear; sepals persistent; petals pale yellow. Alyssum. 

 20. Leaves lanceolate. 21. 



20. Leaves ovate or oblong, cordate at the base. 23. 



21. Leaves clasping by a sagittate base; silicles obovoid or globose. 22. 



21. Leaves not clasping by a sagittate base; pubescent with 2-branched apprcssed 



hairs. Cheirinia. 



22. Stems nearly simple, glabrous or slightly pubescent; pods pear-shaped, 



dehiscent. Camelina. 



22. Stems branching, hispid; pods reticulated, indehiscent. Neslia. 



23. Glabrous and glaucous; leaves oblong to lanceolate; longer stamens connate 



in pairs. Myagrnm. 



23. Glabrous, pale green; leaves obtuse; flowers pale yellow. Conringia. 



24. Flowers small, less than one-third inch broad. 25. 



24. Flowers large, more than one- third inch broad. 29. 



25. Leaves deeply pinnatifid. 26. 



25. Leaves bi-pinnatifid; sepals caducous. Sophia. 



26. Plants of wet places; sepals and pedicels spreading. Radiciila. 



26. Plants of dry places. 27. 



27. Leaves runcinate. 28. 



27. Leaves lyrate; stems angled, glabrous. Barbarea. 



28. Basal and stem-leaves similar; pods appressed. Erysimum. 



28. Basal leaves runcinate; stem-leaves deeply pinnatifid; pods spreading. Norta. 



29. Leaves lyrate or lobed. 30. 



29. Leaves various. 31. 



30. Plants hispid; pods constricted, dehiscent. Sinapis. 



30. Plants rough, pods spongy, indehiscent. Raphanus. 



31. Basal leaves lobed or pinnatifid; stem-leaves reduced to lanceolate. Brassica. 



31. Basal and stem-leaves deeply pinnatifid into narrow lobes. Diplotaxis. 



32. Basal and stem-leaves similar. 33. 



32. Basal and stem-leaves different. 35. 



33. Leaves dentate, cordate, earliest opposite; petals clawed. Liiuaria. 



33. Leaves lanceolate, oblanceolate or obovate. 34. 



34. Plants tall; flowers large, fragrant. Hesperis. 



34. Fleshy plants of the seashore; pods short, 2-jointed. Cakile. 



35. Leaves simple, not lobed. 36. 



35. Leaves deeply lobed. 37. 



36. Basal leaves rosulate; stem-leaves sagittate. Arahis. 



36. Basal leaves orbicular, long-petioled; stem-leaves ovate, coarsely dentate, 



sessile; flowers corymbose. Cardamine . 



37. Leaves pinnately lobed. 38. 



37. Leaves palmately 3-lobed. Dentaria. 



38. Lower leaves pinnatifid, clasping; upper leaves lanceolate; lateral sepals 



slightly gibbous at the base; petals long-clawed. lodanthus. 



38. Lower leaves lyrate; upper leaves small, rough; petals veiny. Raphanus. 



Key to the Brassic.a.ce.e of Ohio Based Upon the Fruit and Other Character- 

 istics Present With the Fruit. 



1. Fruit a silicic, not more than twice as long as broad. 2. 



1. Fruit a silique, more than twice as long as broad. 14. 



2. Pods flattened. 3. 



2. Pods not flattened. 11. 



3. Pods flattened parallel to the partition. 4. 



3. Pods flattened at right angles to the partition. 8. 



4. Stems scapose; basal leaves in a rosette; petals white. Draba. 

 4. Stems leafy. 5. 



