102 BRASSICACEAE 



Inflorescence elongate; pods nearly erect; pedicels about 1 cm. long. 



1. S. Sophia. 

 Inflorescence short; pods spreading; pedicels about 0.5 mm. long. 



2. S. sophioides. 

 Pods 8-15 mm. long; leaves once or twice pinnatifld. 



Stem glabrous, or sparingly stellate or glandular puberulent. 



Leaf-segments all narrow, linear or oblong, or those of the lower 

 leaves broad and obtuse, more or less grayish stellate. 

 Stem grayish stellate, not at all glandular; leaf-segments all 



narrow. 3. S. gracilis. 



Stem very sparingly stellate, often glandular-puberulent ; seg- 

 ments of the lower leaves broad, very obtuse. 



4. S. californica. 

 Leaf-segments all broad, lanceolate or ovate, tliin and bright green. 

 Pods divergent ; primary segments of the uppermost leaves often 



entire. 5. S. leptophylla. 



Pods ascending; primary segments of the leaves all sharply cut- 

 lobed. 6. S. incisa. 



Stem densely glandular-pubescent. 7. S. viscosa. 



Stem diffusely branched; pods 5-8 mm. long. 8. S. purpurascens. 



Pods more or less clavate, 5-12 mm. long, 1-2 mm. wide; seeds u.sually more or 

 less biserial. * 



Pods 8-12 mm. long, mostly erect on spreading pedicels. 

 Leaves and stem green, only sparingly stellate. 



Stem divaricately branched; branches making with the stem an angle 

 of 45 degrees or more; pedicels 7-10 mm. long, usually shorter 

 than the pod. 9. S ramosa. 



Stem simple or with almost erect or strongly ascending branches. 

 Petals much exceeding the sepals. 



Terminal segments of the upper leaves usually elongate, linear, 



entire; segments all narrow. 10. S. filipes. 



Terminal segments not greatly elongate; segments of the lower 



leaves obovate. 11. S. magna. 



Petals not much exceedmg the sepals; segments narrow; terminal 



segments of the upper leaves not elongate. 12. S. intermedia. 



Leaves and stem cinereous-stellate. 



Petals longer than the sepals, about 2 mm. long; upper leaves mostly 

 once pinnate, with elongate, broad terminal segments. 



13. S. andrenarum. 

 Petals not longer than the sepals, about 1.5 mm. long; upper leaves 



usually more dissected; terminal segment narrow, not elongate. 



14. S. haliciorum. 

 Pods 5-8 mm. long. 



Pods acute above, acuminate below; style obsolete. 



Pods ascending or spreading. 15. S. pinnata. 



Pods erect; leaves sparingly stellate. 16. S. Nelsonii. 



Pods acuminate at both ends; style evident. 17. S. leplostylis. 

 Pedicels erect. 



Pods over 1 mm. thick. 



Plant green and almost glabrous. 18. S. procera. 

 Plant cinereous-pubescent. 19. S. Hartvegiana. 

 Pods about 0.75 mm. tliick; plant glandular-puberulent, especially the inflores- 

 cence, or glabrous. 20. S. glandulifera. 

 Lower leaves merely coarsely toothed or lobed; pod twisted. 21. S. perplexa. 



22. MALCOLMIA R. Br. l. M. africana. 



23. CONRINGIA (Heist.) Link. Hare's-e.a.r. l. C. orientalis. 



24. ARABIDOPSIS (DC.) Schur. :Mouse-ear Cress. 

 Stem-leaves not auriculate-clasping or sagittate at the base. 



Annual. 1. A. Thaliana. 



Perennial. 2. A. Richardsonii. 

 Stem-leaves auriculate-clasping or sagittate at the base. 

 Pubescent biennials or perennials. 



Pod 2 mm. thick; style obsolete. 3. A. virgata. 



Pod 1 mm. tliick; style 0.5 mm. long. 4. A. stcnocarpa. 



Glabrous annual. 5. A. glauca. 



25. CHEIRINIA Link. Wild Wall-flower, Prairie-rocket, 

 Yellow Phlox. 



Petals less than 1 cm. long. 



Petals 4-5 mm. long. 1. C. cheiranthoides 



Petals 6-10 mm. long. 



Perennials or biennials; pods ascending. 2. C. inconspicua. 



Annuals; pods spreading. 3. C. repanda. 



Petals more than 1 cm. long. 

 Petals light yellow. 



Biennials or short-lived perennials, not cespitose. 



