Mustard Family 167 



and purple or white flowers. Sepals ovate or oblong, 

 equal at base or 1 or rarely both pair saccate at base, 

 usually colored, their tips erect or spreading. Petals 

 narrow or with a well developed blade and channeled 

 claw, twisted or undulate. The longer filaments some- 

 times connate ; anthers elongated, sagittate at base. 

 Pod linear, compressed ; valves 1-nerved. Seeds in 1 

 row, flattened and more or less winged. Cotyledons 

 accumbent. 



1. S. heterophyllus Nutt. More or less pubescent through- 

 out with spreading simple hairs; stem usually simple, 1 m. 

 high or less; leaves linear, at least the lowest pinnatifid with 

 divaricate lobes or toothed, the upper usually entire; flowers 

 purplish or white, 8-12 mm. long; calyx narrow; sepals slightly 

 saccate; pods abruptly reflexed on slender pedicels 5-7 cm. long, 

 about 1.5 mm. wide, beaked by a slender style; seeds small and 

 crowded, narrowly winged. 



Occasional throughout our range; confined mostly to the chaparral belt. 

 April-May. 



5. LEPIDIUM L. PEPPERGRASS. 



Erect or diffuse, glabrous or pubescent, annual or 

 rarely biennial or perennial herbs, with pinnatifid, lobed 

 or entire leaves and racemose white or whitish flowers. 

 Petals small or rarely wanting. Stamens often fewer 

 than 6. Stigmas, in ours, sessile or nearly so. Silicles 

 oblong or obovate, flattened contrary to the partition, 

 more or less emarginately winged at the apex ; valves 

 keeled, dehiscent. Seeds 1 in each cell, flattened. Coty- 

 ledons incumbent or rarely accumbent. 



* Capsule merely emarginate. 

 *- Pedicels terete. 



1. L. medium Greene. Glabrous or nearly so; stems simple 

 below, branching above, erect, 2-9 cm. high; leaves lanceolate, 

 dentate, rarely pinnatifid; stem leaves entire; pedicels slender, 



