22 CRUCIFERAE 



Cauline leaves sessile, auriculatc-clasping; stamen filaments in pairs, of unequal length; annu- 

 als. Subgenus PARACAirijAJJTHUS. 



Stamens with the filaments all distinct. 



Basal leaves more or loss obovate, dentate. 

 Flowers erect or spreading. 



Pedicels glabrous; raceme with few remote flowers; flowers purplish; pods 



erect or ascending 6. .S'. amplcxicaului. 



Pedicels hirsute; raceme with several flowers; flowers yellowish; pods mostly 



reflexed 7. S. simulans. 



Flowers pendulous; pedicels hispidulose 8. S. californicus. 



Basal leaves oblong or linear, saliently lobed ; pedicels bristly 9. S. insignis. 



Stamens with 1 or 2 pairs of filaments connate. 



Filaments of 1 (rarely 2) pair of stamens connate; pods mostly descending; 8t€m not 



inflated _ 10. S. couUcri. 



Filaments of 2 pairs of stamens connate; pods erect; stem inflated or very succulent. 



11. 5. in flatus. 



B. Stigma circular and entire or only shortly 2-lobed; petals crisped with channeled 

 claw, the limb crisped, usually narrow. 



Filaments of all the stamens distinct; plants all erect, or sometimes diffuse in nos. 15 and 16. — 

 Subgenus Pleiocardia. 

 Plants glabrous and glaucous. 



Branches of inflorescence without bracts; cauline leaves auriculate-clasping at base; 

 sepals dull purplish or green, apex slightly bearded; petals with ovate claw 

 contracted above to a ligulate limb; stamens nearly equal; pedicels less than 

 3 lines long; perennials. 

 Flowers 3 to 4 lines long; pods 1 line broad. 



Cauline leaves broadly oblong to lanceolate, with auriculate base, not crowded.. 



12. S. campestris. 



Cauline leaves cordate, crowded on the stem 13. S. harhatus. 



Flowers 5 to 6 lines long; pods 2 lines broad; cauline leaves cordate-ovate or 



-oblong 14. S. cordatus. 



Branches of inflorescence bearing round- to lanceolate-cordate bracts; petals with ex- 

 panded limb; stamens in 3 unequal pairs; annuals (except 2 varieties of no. 15). 

 Lower leaves oblong-spatulate, crenately toothed or lobed ; mostly montane. 



Pods recurved-spreading ; plants % to 3 or 4 feet high; common, of wide 



range 15. S. tortuosus. 



Pods erect; plants 2 to 7 inches high; rare and local 16. S. gracilis. 



Lower leaves pinnately divided, the segments linear-filiform 17. S. diversifolius. 



Plants hispid; leaves linear to oblong, the lobes or teeth commonly salient 



18. S. heteropliyllus. 

 Filaments of upper pair of stamens connate, bearing reduced anthers; inflorescence non- 

 bracteate; petals with linear obtuse crisped limb; erect annuals. — Subgenus Euclisia. 

 Plants glabrous and often glaucous. 



Calyx with the sepals in pairs, the outer pair sub-orbicular with upper sepal banner-like, 



exceeding other flower parts, the inner or lateral pair ovate, acute 



19. S. polygaloides. 

 Calyx with the upper sepal not banner-like. 



Pods usually somewhat torulose; calyx regular or nearly so. 



Leaves broad ; petals in dissimilar pairs 20. S. ireweri. 



Leaves narrow; petals in similar pairs 21. S. iarbiger. 



Pods not torulose; calyx \rith the 3 upper sepals approximate or connivent at tip, 



the lower one free; corolla irregular 22. S. niger. 



Plants hispid, at least below. 



Calyx commonly glabrous ; plants erect. 



Eaeemes loose; 3 upper sepals approximate or connivent at tip, the lower free; 



pods ascending 23. S. glandulosus. 



Bacemes dense, secund; 2 upper sepals approximate or connivent; pods recurved 



or drooping 24. S. secundus. 



Calyx more or less hispid, with sepal tips distinct and free; plants bushy-branched 



25. S. hispidus. 



1. S. pilosus Jepson. Biennial ; stem simple or branched sparingly, 1% to 

 3^2 feet high; herbage mainly glabrous but the lower parts densely hispid; leaf- 

 blades pinnately parted into ovate or oblong lobes (the lobes irregularly lobed or 



