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, thin 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 usually 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 exceeding the sepals; segments narrow; terminal 



segments ofthe 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. halictorum. 

 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. leptostylis. 

 Pedicels erect. 



Pods over 1 mm. thick. 



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

 Plant cinereous-pubescent. 19. S. Harlvegiana. 

 Pods about 0.75 mm. thick; 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. 



23. CONRINGIA (Heist.) Link. Habe's-bar. 



24. ARABIDOPSIS (DC.) Schur. Mousb-eak Cress. 

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



Annual. 

 Perennial. 

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

 Pubescent biennials or perennials. 



Pod 2 mm. thick; style obsolete. 



Pod 1 mm. thick; style 0.5 mm. long. 

 Glabrous annual. 



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 Ught yellow. 



Biennials or short-lived perennials, not cespitose. 



