MUSTARD FAMILY 23 



toothed), 114 to 5 inches long, the petioles about half as long; raceme lax; flowers 

 4 to 5 lines long; sepals elliptic, green or purple, white-membranous-margined; 

 petals whitish, the limb very narrow, acute, scarcely exserted; pods slender, flexu- 

 ous, ascending or widely divaricate, 2^/2 to 5 inches long; pedicels 2l^ to 4 lines long. 

 Sandy soil, deserts, 4600 to 6000 feet: Inyo Co. East to Nevada, north to 

 Oregon and Idaho, Apr.-May. 



Locs. — Darwin Valley, Jones; Lone Pine Creek; Bishop, Heller 8295. Candelaria, Nev., 

 ShocMey 5. 



Eefs. — Streptanthus pllosus Jepson, Man. 415 (1925). Caulanthus pilosus Wats. Bot. 

 King 27 (1871), based on specimens from the Truckee VaUey and Humboldt Lake, Nev., Watson. 



2. S. hallii Jepson comb. n. Annual; stem erect, 2 to 5 feet high, branching 

 from the base upward, the branches erect; herbage glabrous or nearly, save that 

 the lower leaves are hirsutulose or hispidulose with few scattered hairs; leaves 

 chiefly basal or sub-basal, 2 to 7 inches long, the blades pinnately parted with sali- 

 ent or angular lobes, or irregularly pinnatifid, the lowest petioled, the upper ones 

 reduced, their blades linear or lanceolate, entire or subentire, sessile, not auriculate; 

 racemes very loose, several to many-flowered, the flowers % to 1% inches apart; 

 flower buds elliptic-ovate, hispidulose; flowers 3^4 lines long; pedicels and calyx 

 sparsely hirsute or bristly; sepals whitish, pilose; petals white, somewhat con- 

 stricted between claw and limb; pods curved or flexuous, widely spreading or 

 ascending, 3^^ to 4% inches long; stigma cupulated rather than 2-lipped. 



Hill slopes and canons, 2000 to 5200 feet: desert slope of mountain ranges 

 bounding the Colorado Desert on the northwest and west, from the Lookout Mt. 

 region to the Balcan Mts. Apr. 



Locs. — Piiion Well n. of Indio, Jepson 6002; Coyote Canon, Santa Eosa Mts., Mall; San 

 Felipe, T. Brandegee. 



Eefs. — Streptanthus HAiiLn Jepson. Caulanthus hallii Payson, Ann. Mo. Bot. Gard. 9:290 

 (1922), type loc. Coyote Canon, Santa Eosa Mts., Kail 1165. 



3. S. glaucus Jepson. Stem stout, branching, 1 to II/2 feet high, arising from 

 a perennial root; herbage glabrous, glaucous; leaf -blades orbicular to roundish- 

 obovate or ovate, entire or subentire, % to 3^4 inches long, the upper lanceolate, all 

 on petioles % to % as long; flowers 5 to 51/2 lines long; sepals oblong or elliptic, 

 V2 to % as long as the petals; petals greenish, the limb plane, nearly erect, about as 

 long as and obviouslj'' narrower than the broad claw; pods slender, 3 to 6 inches 

 long, on pedicels 3 to 5 lines long. 



Kocky slopes in the desert, 5000 to 7500 feet : White Mts. East to Nevada. 

 June. 



Tax. note. — In this unique species the root-crown is sometimes quite woody and the stems 

 a little inflated. The foliage is slightly succulent ; the stigma is bifid. 



Locs. — Silver Canon, White Mts., Jepson 7212, 7221 (root distinctly perennial), Buran 1513. 

 Candelaria, w. Nev., ShocMey; Gold Mt., Nev., Purpus 5974. 



Eefs. — Streptanthus glaucus Jepson, Man. 415 (1925). Caulanthus glaucus Wats. Proc. 

 Am. Acad. 17:364 (1882), type loc. Candelaria, Esmeralda Co., Nev., ShocMey. 



4. S. crassicaulis Torr. Annual; stem simple, strongly inflated, l^/^ to 3% 

 feet high, the leaves mainly in a basal tuft, the cauline few and reduced; herbage 

 glabrous; leaf -blades ovate or oblong and obtuse to lanceolate and acute, entire 

 above, but with 1 or 2 pairs of salient oblong or linear lobes at or towards the base, 

 1 to 3 inches long, the petioles 1 to 1% times as long, sometimes bearing one or two 

 supplementary leaflets; flowers 5 to 7 lines long, spreading on pedicels % to 1 line 

 long; calyx densely white-woolly, sometimes glabrate in age and then purple; 

 petals dark purple, white-margined; pods slender, terete, ascending, 3I/2 to 4% 

 inches long. 



