Mustard Family 173 



13. DENTABIA L. 



Perennial herbs growing in damp woods, with fleshy 

 tuberous rootstocks, erect mostly unbranched stems and 

 more or less divided leaves. Flowers large, white or 

 often tinged with purple. Petals much longer than the 

 sepals with slender claw and ovate spreading blades. 

 Siliques linear, flattened, their valves nerveless. Seeds 

 in 1 row in each cell, wingless. Cotyledons thick often 

 unequal, accumbent. 



1. D. Californica Nutt. Rootstock slender, tubers small; 

 stem 2-3 dm. high, rather stout, simple or branched above, gla- 

 brous or nearly so ; basal leaves entire or 3-foliate, the leaflets 

 petiolulate, suborbicular, sinuate or coarsely toothed; cauline 

 2-4, mostly shortly petioled and above the middle of the stem, 

 deeply lobed or pinnately 3-5-foliate, rarely simple, the leaflets 

 mostly petiolate, ovate to lanceolate-linear, entire or toothed, 2-7 

 cm. long; flowers white or rose-colored ; pods 2-6 cm. long; style 

 4-6 mm. long; seeds oblong. 



Frequent in damp shady places in the mountains and foothills. March- 

 April. 



14. TBOPIDOCABPUM Hook. 



Slender erect branching annuals, more or less hirsute- 

 pubescent with simple hairs or with a few forked ones 

 intermingling. Leaves pinnatifid. Flowers yellow, 

 borne in loose leafy-bracted racemes. Sepals concave, 

 spreading, equal at base. Petals spatulate-obovate. 

 Stamens tetradynamous ; anthers short, rounded. Stig- 

 ma circular or slightly emarginate, on a slender style. 

 Silique partially or completely 2-celled, ours obcom- 

 pressed, sometimes twisted. 



1. T. gracile Hook. Stems slender, erect or spreading, usu- 

 ally 15-25 cm. long, more or less pubescent; leaves shallowly or 

 deeply pinnatifid, the segments acutish, cleft or entire ; cauline 

 leaves reduced; pedicels axillary, spreading, 6-20 mm. long; 



