MUSTARD FAMILY 31 



Var. optatus Jepson var. n. Biennial or triennial, 1% to 2^/4 feet high; branches erect, 

 simple, few or several from the basal woody main stem; leaves dimorphic, those of the first, 

 second and third year sterile shoots obovate to oblong, serrate or subentire, 1 to 2i/^ inches long, 

 drawn down to petioles 4 to 9 lines long; leaves of the flowering shoots, at least the upper ones, 

 cordate-clasping as in the species; racemes tending to be secund. — (Herbae biennes vel triennes, 

 rami simplices, erecti, e cauli primo basilari lignosi; folia pulli sterili, [anni primi, secundi et 

 tertii] obovata vel oblonga, serrata vel subrntegerrima, unc. 1-2 14 longa; racemi esse secundi 

 inclinati.) — Openly wooded slopes in the mountains or foothills, 1100 to 5700 feet: Fresno Big 

 Trees, Madera Co. (Jepson 15,998, type, the flowering stems mostly in threes, noticeably diverging 

 yet in the main erect) ; Gwin Mine, Calaveras Co., Jepson 1807. 



Refs. — Streptanthtjs tortuosus Kell. Proc. CaL Acad. 2:152, fig. 46 (1863), type loc, 

 "the Copper region of the Sierra Nevada, C. D. Gibhs" (probably in western Calaveras Co. or 

 Amador Co.). Pleiocardia tortuosa Greene, Lflts. 1:86 (1904). Var. ORBictlLATUS Hall, Univ. 

 Cal. Publ. Bot. 4:197 (1912) ; Jepson, Man. 418, fig. 409 (1925). S. orbicuJatiis Greene, Fl. Fr. 

 258 (1891), type loc. n. of Donner Lake; Jepson, Fl. W. Mid. Cal. 214 (1901), ed. 2, 182 (1911). 

 Pleiocardia orhiculata Greene, Lflts, I.e. Var. flavescens Jepson, Man. 418 (1925), type loe. 

 Coyote Pass trail, Sawtooth Range, Jepson 982. Var. oblongus Jepson, Man. 418 (1925), type 

 loc. Burnt Ranch, Trinity Co., Tracy 6099. Var. pallidus Jepson. \ar. suffrutescens Jepson, 

 Man. 418 (1925) in part. S. suffrutescens Greene, Erythea 1:147 (1893), type loe. Hoods Peak, 

 Sonoma Co., Bioletti; Jepson, Fl. W. Mid. Cal. 213 (1901), ed. 2, 181 (1911). Pleiocardia suf- 

 frutescens Greene, Lflts., I.e. Var. optatus Jepson. 



16. S. gracilis Eastw. Annual; stem simple or with delicate branches from 

 near the base, 2 to 7 inches high; herbage glabrous; blades of lower leaves orbicular 

 to spatulate, sinuate-dentate to pinnately lobed, 2 to 6 lines long, on petioles 1 to 3 

 times as long; upper cauline leaves mostly sessile, oblong to ovate, toothed or entire, 

 auriculate-clasping, 2^/^ to 6 lines long; raceme 1 to 3 inches long, bearing below 

 1 or 2 small ovate sessile bracts (1^2 to 2 lines long) ; flowers 3I/2 to 4 lines long; 

 sepals rose-purple, the tips membranously margined, spreading; petals lavender- 

 purple to pink, with slender claw exserted, the limb broad, purple-veined; upper 

 pair of filaments longest; pods erect, slender, V/o to 2 inches long. 



Disintegrated granite, 10,000 feet: region of the Kings-Kern divide, Sierra 

 Nevada. July. 



Locs. — Bullfrog Lake, Fresno Co., Jepson 835 ; head of Kern Canon, Jepson 5032. 



Refs. — Streptanthus gracilis Eastw. Proc. Cal. Acad. ser. 3, 2:285 (1902), type loc. trail 

 from East Lake to Harrison Pass, Tulare Co., Eastwood; Jepson, Man. 418 (1925). Pleiocardia 

 gracilis Greene, Lflts. 1:86 (1904). 



17. S. diversifolius Wats. Annual; stem erect and slender, branching above, 

 10 to 22 inches high; cauline leaves very narrowly linear, pinnately di\aded into 

 a few remote narrowly linear or filiform segments, or sometimes linear and entire; 

 bracts of the inflorescence broadly cordate, commonly long-caudate at apex; sepals 

 pale with short recurved tips; petals at first pale lemon-yellow, becoming whitish 

 and yellow-veined, 3 to 4 lines long, the limb orbicular ; filaments in pairs, the upper 

 longest, all distinct; anthers long, sagittate; pods straightish or a little curved, 

 reflexed, about 3 inches long, % line broad, style short; pedicels ^/2 to 2 lines long; 

 seeds broadly elliptical, narrowly winged. 



Rocky places in the foothills, 1000 to 4700 feet : Sierra Nevada foothills from 

 Amador Co. to Tulare Co. Apr.-June. 



Tax. note. — In the upper leaves the broad base tapers upward suddenly to a linear prolonga- 

 tion which is tipped with a small blunt enlargement. The lower leaves have a similar enlargement 

 at the tip of the divisions. A similar structure is often found on the leaves of Streptanthus 

 polygaloides and S. breweri, but not, apparently, on those of S. tortuosus. The flowers in position 

 of parts are sometimes a little "bilabiate", as in S. tortuosus. 



Locs. — Hog Ranch, Hetch-Hetchy, A. L. Grant 966; Mormon Bar, Congdon; Dunlap to 

 Millwood, Fresno Co., Jepson 2765; Kaweah, Hopping 284; Bear Creek, Tulare Co., Purpus 1743. 



Refs. — Streptanthus diversifolius "Wats. Proc. Am. Acad. 17:363 (1882), type loc. 

 "Cosumne Creek" (=Cosumnes River), Rattan 223; Gray, Syn. Fl. li:168 (1895) ; Jepson, Man. 

 419 (1925). Mitophyllum diver sifolium Greene, Lflts. 1:88 (1904). S. linearis Greene, Pitt. 



