60 CRUCIFERAE 



Flowers greenish-white; herbage hirsute; l)iennial i. A.hir.ftita. 



Flowers crimson or rose-purple, showj'; herbage commonly glabrous but the leaves ciliate 

 with forked hairs; perennial 5. A. blcpharophylla. 



2. Seeds wing-margined; pods flattened or flattish. 



a. Pods narrowly linear. 



Cauline leaves petioled, the blades entire or slightly toothed, the basal ones repand or dentate 



6. A. repanda. 

 Cauline leaves mostly sessile. 



Herbage glabrous or somewhat pubescent below; biennial or perennial; middle and high 

 altitudes, Sierra Nevada. 



Pods erect; root-crown slender (1 to 2 lines thick), simple or branching 



7. A. drummondii. 



Pods ascending; root-crown very thick (3 to 12 lines in diameter), commonly simple 



8. A. eognata. 

 Herbage more or less pubescent; pods spreading or reflexed. 

 Plants 2 to 7 inches high ; perennial. 



Pedicels glabrous; flowers 2 to 3 lines long; high Sierra Nevada 9. A. lemmonii. 



Pedicels pubescent; flowers 3 to 5 lines long; Coast Kange peaks 10. A. brewcri. 



Plants 7 to 18 inches high. 



Cauline leaves pinnately and rather closely incised; basal leaves narrowly linear, 



in silvery tufts; biennial or perennial 11. A. subpinnatifi4ia. 



Cauline leaves entire or merely dentate or serrate. 



Koot-crown simple or with few branches, rarely woody. 



Corolla commonly white or nearly so, sometimes jjurple. 



Flowering racemes at first very dense; flowers soon pendulous; pedi- 

 cels puberulent; corolla white; fruiting racemes secund; 



biennial or perennial 12. A. seeiinda. 



Flowering racemes loose ; flowers not pendulous in anthesis ; pedicels 

 mostly pilose ; corolla white or purple ; fruiting racemes not 



secund; biennial 13. A. retrofracta. 



Corolla dark red or pinkish- white. 



Herbage hoary with a fine dense pubescence; pedicels glabrous or 

 only scantily puberulent; Great Basin region. 



Corolla 1^2 to 2 lines long; stem scantily leafy; perennial 



14. A. canescens. 



Corolla 314 to 4 lines long; stem densely leafy; biennial 



15. A. beclcwithii. 

 Herbage puberulent or pubescent ; cismontane or mostly. 



Fruiting racemes mostly secund; pods straight; root-crown simple 

 or shortly branched; pedicels glabrous; corolla 2 to 3 

 lines long, white or pinkish; biennial; middle altitudes 



in the mts 16. A. rectissima. 



Fruiting racemes not secund or rarely so; pods mostly curved; 

 root-crown with long leafy branches; pedicels pubescent; 

 corolla dark red, 3 to 5 lines long; perennial; chiefly in 



the foothills or at low altitudes in the mts 



17. .4. arcuata. 

 Root-crown with branches several to many, woody ; desert perennials. 



Ovary usually densely tomentulose; pods deflexed or pendent, I'V^ lines 



wide; herbage canescent 18. A. pidchra. 



Ovary glabrous or nearly so; pods mostly spreading or recurved, % to 1 

 line wide 19. A. perennans. 



b. Pods broadly linear to oblong or elliptic, flattened ; perennials. 

 Pods pendent or deflexed, glabrous ; plants 7 to 14 inches high. 



Herbage glabrous; pods linear, 2 lines wide, acute or attenuate-acute at apex 



20. A. suffrutescens. 

 Herbage canescent; pods oblong, rounded at each end, 3 lines wide 21. A. glaucovalvula. 



Pods not pendent or deflexed. 



Pods ascending; leaves hoary-canesccnt 22. A. nardina. 



Pods erect. 



Style % to % line long or stigma sessile ; herbage green. 



Basal leaves not densely crowded, about 1 inch long 23. A. platysperma. 



Basal leaves in a very dense tuft, 3 to 6 lines long 24. A. inamoena. 



Style 2 to 2^ lines long; herbage canescent 25. A. parishii. 



