BRASSICACEAE. 157 



14. DENTARIA 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. calif omica Nutt. Rootstock slender, tubers small; stem 

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



15. TROPIDOCARPUM 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, usually 

 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; pods lance- 

 linear to linear, 1-2 cm. long, strongly obcompressed throughout; 

 seeds in 2 rows in each cell. 



Frequent in interior valleys. March-May. 



2. T. dubium Davidson. Much resembling the last in habit, 

 foliage and pubescence; capsule linear, 2-celled and strongly ob- 

 compressed above the middle, by a twist becoming compressed 

 below and only 1-celled. 



Frequent about Los Angeles. March-May. 



16. DITHYREA Harv. 



Low branching annuals, with stout stems and thickish 

 ovate or orbicular subentire leaves, the whole herbage 



