MUSTARD FAMILY 33 



Var. hesperidis Jepson comb. n. Stem with few mostly simple branches; racemes secund 

 or mostly so ; sepals greenish ; petals little exserted ; upper pair of petals whitish, the limb acute 

 or narrow at apex, the lower pair with broader or rounded limb, whitish and purplish-veined. — 

 Dry rocky slopes, 1500 to 2500 feet, Putah Creek basin : Knoxville grade, Jepson 13,355 ; Butts 

 Canon, Napa Co. ; Mt. St. Helena, Tracy 2238 ; Moore's Creek, Howell Mt., Tracy 2219. This 

 variety is disposed to lose its basal leaves early. 



Refs. — Strepta2^thus breweei Gray, Proc. Am. Acad. 6:184 (1864), based on spms. from 

 Arrovo del Puerto, near Mt. Oso, sw. Stanislaus Co., Brewer 1268, and Mt. San Carlos, San Benito 

 Co., Brewer 790; Jepson, Fl. W. Mid. Cal. 214 (1901), ed. 2, 182 (1911), Man. 419, fig. 411 

 (1925). Pleiocardia breweri Greene, Lflts. 1:86 (1904). Var. hesperidis Jepson. jSi. hesperidis 

 Jepson, Erythea 1:14 (1893), type loc. Knoxville grade to Lower Lake, Lake Co., Jepson 13,355. 

 Pleiocardia hesperidis Greene, Lflts. 1:86 (1904). 



21. S. barbiger Greene. Aimual; stem with erect branches from above the 

 base, 1 to 2^/4 feet high; leaves 1 to 6 inches long, the blades linear to elongated 

 linear-lanceolate, entire or the lower dentate, auriculate at base or not at all auri- 

 culate, sessile or drawn down to a short petiole; racemes mostly a little loose; 

 flowers 3 lines long, disposed to be secund, often markedly so; sepals greenish with 

 whitish or membranous recurved tips; limb of petals rounded, not crisped or 

 scarcely; upper pair of petals white, lower pair white with a purple band from 

 claw running nearly to center of limb; upper pair of filaments united to top, the 

 lower pair united half way; pods reflexed or reflexed-sp reading, slightly curved, 

 rather obscurely torulose, but little known; seeds not winged. 



Openly brushy slopes, 500 to 1500 feet : Lake Co. to Napa Co. June-July. 



Tax. note. — Greene (Fl. Fr. 260) describes the calyx as "bristly -hairy", an apparently un- 

 usual character for S. barbiger as we now know it. The calyces sometimes exhibit parallel hairlike 

 lines in relief which imitate apprcssed bristles. However, this entire breweri-barbiger-niger series 

 is unusually productive of variables, even for Streptanthi. 



Locs. — Snow Mt., T. Brandegee; Lakeport, C. F. BaTcer 3059; Mt. Hanna, Jepson 13,354; 

 St. Helena (Fl. Fr. 260). 



Refs.— Streptanthxts barbiger Greene, Pitt. 1:217 (1888), type loc. Highland Sprs., Lake 

 Co., A. B. Simonds; Jepson, Fl. W. Mid. Cal. 214 (1901), ed, 2, 182 (1911). Mesoreanthus bar- 

 iiger Greene, Lflts. 1 :89 (1904). M. faJlax Greene, I.e. 90, type loc, St. Helena, Greene. M. vimi- 

 neus Greene, I.e. 90, type loc. Lakeport, C. F. Baker 3059, 



22. S. niger Greene. Annual; stem stout, 1% to 3 feet high, branched above 

 an erect main axis 2 to 12 inches long; leaves linear, the blades of the lower ones 

 pinnately but shallowly lobed or toothed, the blades of the upper entire and auric- 

 ulate-clasping; racemes loose, flexuous, the pedicels 3 to 9 lines long; sepals dark 

 purple or black; petals very narrow, white with dark purple mid-vein; pods straight 

 or only slightly curved, ascending, 1 to 2 inches long, 1 line broad; seeds narrowly 

 winged. 



Hillslopes, 50 to 400 feet : Tiburon, Marin Co, Apr.-May, Closely allied to 

 S, glandulosus. 



Tax. note. — The fluctuating Streptanthus glandulosus furnishes certain variants which ap- 

 proach S. niger but none of them has all the characters of S, niger, which seems to be an extreme 

 derivation. The stems and leaves of S. niger are quite glabrous, a condition not found in speci- 

 mens of S. glandulosus. The pedicels in the latter species are usually shorter than the flowers, in 

 the former they are nearly twice as long. S. niger is known only from Tiburon. A similarly 

 restricted endemic is CastUleia negleeta Zeile, while Convolvulus superatus Jepson var. purpuratus 

 (Greene) Jepson and Monardella negleeta Greene are nearly confined to the Tiburon peninsula. 



Refs.— Streptanthus niger Greene, Bull. Torr. Club 13:141 (1886), type loc. Tiburon, 

 Marin Co., Greene, Man. Reg, S. F. Bay 16 (1894) ; Jepson, Fl. W. Mid. Cal. 214 (1901), ed. 2, 

 182 (1911), Man. 419 (1925). EucUsia nigra Greene, Lflts. 1:83 (1904). E. violacea Greene, 

 I.e., type loc. mid. Cal., Palmer, probably belongs here, though we have seen no authentic spms. 



23. S. glandulosus Hook. Jewel Flower. Annual; stem nearly simple or 

 with ascending branches from an erect axis, 1 to 2 feet high; herbage more or less 

 hispid; blades of the lower leaves oblanceolate, coarsely and often saliently toothed, 

 at least the basal slender-petioled, the blades of upper leaves lanceolate to linear. 



