174 Cruciferae 



pods lance-linear to linear, 1-2 cm. long, strongly obcompressed 

 throughout; seeds in 2 rows in each cell. 

 Frequent in our interior valleys. March-May. 



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

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

 obcompressed above the middle, by a twist becoming compressed 

 below and only 1-celled. 



Frequent about Los Angeles. This species is very closely related to the 

 last and may prove to be only a tortological form. March-May. 



15. DITHYBEA Harv. 



Low branching annuals, with stout stems and thickish 

 ovate or orbicular subentire leaves, the whole herbage 

 more or less cinerous-tomentose with stellate hairs. In- 

 florescence racemose, dense, often branched. Flowers 

 whitish or purple. Sepals ovate to oblong, erect or 

 spreading, pubescent. Petals conspicuous with spreading 

 blade and slender claw. Stamens 6 with linear sagittate 

 anthers. Pods strongly obcompressed, 2-celled ; the 

 cells nearly orbicular, indehiscent with a thickend mar- 

 gin, separating at maturity from the persistent linear 

 axis, 1-seeded. Seeds flat, marginless. Cotyledons 

 accumbent. 



1. D. Californica maritima Davidson. Branching from the 

 base, 15-30 cm. high; leaves thick, fleshy, densely pubescent, the 

 basal narrowed to slender petioles, the upper sessile, coarsely 

 toothed or subentire; racemes short, very dense, elongated in 

 fruit; flowers about 12-15 mm. broad; limb purplish; pedicels 

 dark purple ; pods 8-10 mm. wide, half as long, emarginate above 

 and below, pubescent on the margins. 



Occasional along the seashore between Redondo and Port Ballona. 



16. HUTCHINSIA R. Br. 



Low slender mostly diffuse herbs, more or less pubes- 

 cent with forked hairs, ours annual with entire or pin- 

 nately lobed leaves and minute white flowers in terminal 



