18 CRUCIFERjE. 



petals with ample purple-veined crisped limb: upper pair of filaments 

 connate to near their tips, the free parts scarcely divergent, the anthers 

 reduced in size, but polliniferous : pods 2 in. long, very slender, falcate- 

 recurved, the valves carinate- veined: seeds small, wingless. Northern 

 base of Mt. Tamalpais, a rare and peculiar species. 



7. THELYPODIUM, Endl Coarser than Streptanthus, often 

 biennial; the racemes often shorter and condensed. Calyx green, 

 whitish or purplish; sepals equal at base. Petals with narrow claw and 

 flat linear to obovate limb, exserted, white, yellowish or rose -color. 

 Stamens tetradynamo us; filaments never connate; anthers sagittate at 

 base, curved. Pod usually long, linear, terete or slightly compressed, 

 sessile or short stipitate. Seeds in 1 row, oblong, somewhat compressed, 

 not winged. 



1. T. procerum (Brew.), Greene. Annual, stoutish, branched from 

 near the base, 37 ft. high, glabrous except at base: lower leaves 

 petiolate, coarsely pinnatifid; upper lanceolate, sessile, acuminate: 

 racemes long and lax : fl. greenish or yellowish white, 4 5 lines long, 

 on ascending pedicels half as long: pod very slender, terete, 3 5 in. 

 long, less than a line wide, acuminate, erect or somewhat spreading. 

 In fields at the eastern base of Mt. Diablo. 



2. T. flavescens (Torr.), Wats. Sparsely pilose-hispid below : lower 

 leaves elongated, petiolate, sinuately toothed; upper entire, sessile, not 

 auricled: raceme long and lax: fl. yellowish or rarely purplish, 4 5 

 lines long: sepals narrow and with the pedicels hispidalous: petals long- 

 exserted, with linear and narrow claw; the blade dilated: pod 1% in. 

 long, nearly terete, sparsely hispidulous, erect or somewhat spreading. 

 Fields of the lower Sacramento. 



3. T. Hookeri, Greene. Size, habit and whole aspect of the pre- 

 ceding, but lower leaves often pinnatifid, though as often sinuate- 

 toothed; inflorescence the same, also size and color of fl. but sepals 

 broader, less spreading, glabrous: petals with a rather broad claw and 

 relatively narrow blade: pods 2 in. long, slender, terete, erect. In the 

 Mt. Diablo Range. 



4. T. rigidnm, Greene. Stoutish and very rigid, 13 ft. high, with 

 few wide-spread branches: hispidulous below, glabrous above, deep 

 green, not glaucous: lower leaves somewhat lyrately pinnatifid; upper 

 oblong-lanceolate and laciniate-toothed : fl. yellowish, small, rather 

 crowded and subsessile, the fruiting raceme long and loose: pods 1% in. 

 long, nearly tessile, ascending or somewhat spreading or curved, rigid, 

 sharply tipped with a short style. Eastern base of the Mt. Diablo Range, 

 from near Antioch southward, chiefly on clayey hillsides. 



