254 BRASSICACEAE 



2-4 dm. long. Stem leaves suborbicular to ovate or oblong, obtuse, shallowly sinuate-dentate, 

 cordate-clasping, 2-5 cm. long; flowers few and remote; sepals more or less saccate, 7 mm. 

 long; petals purplish, broadly linear, about 11 mm. long, upper part strongly crisped; pedicels 

 ascending or divaricate, 12-20 mm. long ; pods spreading, curved, terete, slender, 6-8 cm. long ; 

 stipe less than 1 mm. long, stigma small, entire. 



Dry, gravelly slopes, mainly in the Transition Zone; mountains of southern California. Type locality: San 

 Bernardino Mountains. April-July. 



2. Caulanthus Cooperi (S. Wats.) Payson. Cooper's Caulanthus. Fig. 1957. 



Thelypodium Cooperi S. Wats. Proc. Amer. Acad. 12: 246. 1877. 

 Guillenia Cooperi Greene, Leaflets Bot. Obs. 1: 228. 1906. 

 Caulanthus Cooperi Payson, Ann. Mo. Bot. Gard. 9: 293. 1923. 



Annual, glabrous or sparingly short-pubescent, somewhat glaucous, the stem slender, flexu- 

 ous, 2-6 dm. long. Lowermost stem leaves oblong to oblanceolate, narrowed to a broad petiole, 

 entire or sinuate-lobed, obtuse, 2-6 cm. long; other stem leaves sagittate, mostly entire, acute; 

 inflorescence lax, racemose; pedicels stout, recurved, 1-3 mm. long; sepals greenish, scarcely 

 saccate, 6-7 mm. long ; petals pale yellow, linear-spatulate, 2-3 mm. longer than the sepals ; pods 

 deflexed, terete, glabrous or short-pubescent, 2-4 . 5 cm. long, sessile ; style 1-2 mm. long ; stigma 

 small, shortly 2-lobed. 



Upper and Lower Sonoran Zones; Mojave and Colorado Deserts, California, to southern Nevada and 

 Western Arizona. Type locality: near Fort Mojave, California. March-April. 



3. Caulanthus stenocarpus Payson. Slender-podded Caulanthus. Fig. 1958. 



Caulanthus stenocarpus Payson, Ann. Mo. Bot. Gard. 9: 300. 1923. 



Annual, more or less densely hirsute-pubescent with flattened trichomes, the stems erect, 

 slender, simple or branched, 3-4 dm. high. Stem leaves few, linear-lanceolate, subentire, sessile, 

 amplexicaul, 1-2 cm. long ; inflorescence lax, racemose ; pedicels recurved, 1-2 mm. long, hirsute ; 

 flowers pendent ; sepals purple, linear-lanceolate, not saccate, nearly equal, glabrous or nearly 

 so, about 4 mm. long ; petals veined with purple, broadly linear, about 6 mm. long ; pods divari- 

 cate-descending or pendent, terete or slightly quadrangular, 2-4.5 cm. long, 1 mm. or less wide, 

 sparsely retrorse-pubescent. with flattened trichomes, or glabrous ; style 1-2 mm. long ; stigma 

 small, entire. 



Dry hillsides, Sonoran Zones; San Diego County, California. Type locality: dry hillsides near Ber- 

 nardo. May. 



4. Caulanthus calif ornicus (S. Wats.) Payson. California 



Caulanthus. Fig. 1959. 



Stanfordia calif ornica S. Wats. Bot. Calif. 2: 479. 1880. 

 Streptanthus californicus Greene, Fl. Fran. 256. 1891. 



Annual, glabrous or very sparingly pilose near the base, the stem erect, branched, 2-4 dm. 

 high. Basal leaves oblanceolate, sinuately lobed to pinnatifid, obtuse, 3-6 cm. long; stem leaves 

 ovate to oblong, amplexicaul, shallowly dentate, obtuse; inflorescence lax, racemose; pedicels 

 pilose, 5-10 mm. long; sepals purple-tipped, unequal, membranous and saccate near the base, 

 7-9 mm. long ; petals whitish, but little longer than the sepals, claw dilated, blade small, crisped ; 

 longer pair of filaments sometimes slightly united at the base ; pods ascending or deflexed, 

 straight, 2-4 cm. long, 2-3 mm. wide, slightly compressed or quadrangular. 



Dry plains and hillsides. Lower Sonoran Zone; southern San Joaquin Valley and eastern San Luis Obispo 

 County, California. Type locality: near Tulare. Feb. -May. 



5. Caulanthus simulans Payson. Payson's Caulanthus. Fig. 1960. 



Caulanthus simulans Payson, Ann. Mo. Bot. Gard. 9: 295. 1923. 

 Streptanthus simulans Jepson, Man. Fl. PI. Calif. 417. 1925. 



Annual, densely short-hirsute below, sparingly so above, the stem much branched from near 

 the base and upwards, 3-4 dm. high. Stem leaves oblong to lanceolate, sessile, sagittate at the 

 base, subentire or sinuate-dentate ; inflorescence racemose ; pedicels hirsute, somewhat recurved, 

 3-5 mm. long, sparsely hirsute ; petals whitish, broadly linear or narrowly spatulate, somewhat 

 crisped, 8-10 mm. long; pods straight, divaricate-descending, terete, glabrous, 4-6.5 cm. long; 

 stigma definitely 2-lobed. 



Transition and Upper Sonoran Zones; Santa Rosa and Cuyamaca Mountains, southern California. Type 

 locality: "Coyote Canyon, El Toro Mountain, California." March-June. 



6. Caulanthus Coulteri S. Wats. Coulter's Caulanthus. Fig. 1961. 



Caulanthus Coulteri S. Wats. Bot. King Expl. 27. 1871. 

 Streptanthus Coulteri Greene, Fl. Fran. 257. 1891. 



Annual, more or less densely hirsute-pubescent, especially toward the base of the stem, this 

 erect, simple or sparingly branched, 3-7 dm. high. Stem leaves broadly linear to oblong or 

 oblanceolate. 4-8 cm. long, all but the lowermost amplexicaul, sinuate-dentate to subentire; 

 inflorescence lax, racemose ; pedicels hirsute, reflexed, 5-10 mm. long ; sepals purple in the 

 bud, becoming lighter in anthesis, glabrous or hirsute, unequal, scarcely saccate, 7-15 mm. long; 



