MUSTARD FAMILY 87 



tions) Jones 3272 (San Francisco) which is L. bipinnatifidum of California authors and quotes 

 as a synonym L, strictum Eattan, which is L. bipinnatifidum of California authors likewise. 

 Without much doubt L. reticulatum Howell should be considered a synonym of. L. pubescens Desv. 



12. L. robinsonii Thell. Friends Pepper-grass. Stems several to many from 

 the base, ascending or diffuse, 3 to 10 inches long, or the stem one, erect, with few 

 branches above the base; stems hirsutulose with spreading hairs, the leaves scantily 

 hirsutulose or puberulent or subglabrous; leaves ^2 to ll^ inches long, bipinnately 

 divided, the lobes discrete, oblong, elliptic or obovate, % to 5 lines long; racemes 

 only slightly open, 2 to 3I/2 inches long, usually taking up a lateral position through 

 dominance of the axillary shoot, thus apparently standing opposite the leaves; 

 pedicels about 1 line long, spreading nearly horizontally, a little curved; petals 

 none; pods suborbicular, glabrous (the margin scaberulous), 1^4 lines long, the 

 notch at apex shallow, v-shaped. 



Valley flats or mesas, 5 to 1500 feet: coastal Southern California; apparently 

 a rare plant. Feb. -Mar. 



Tax. note. — The peduncles of the racemes are commonly not leafy. In some cases the 

 racemes are incipient from near the base. The ultimate segments of the leaves are broadest at 

 the middle, mostly contracted at base and tend to be obtusish or rounded at apex, though some- 

 times acute; sometimes a pinna is noticeably trefoil-shaped, sometimes on a single leaf the seg- 

 ments are conspicuously unequal. In L. pubescens, with which this may be confused, the ultimate 

 segments are narrower, not so conspicuously contracted at base or not at all, commonly very acute 

 at apex, and usually less unequal. 



Locs. — San Bernardino, Parish; Eiverside, C. M. Wilder 1121; Kamona, K. Brandegee (an 

 excellent match for an isotype of the species) ; San Diego, Cleveland 4" Parry. 



Kefs. — Lepidium robinsonii Thell. Mitteil. Bot. Mus. Zurich 28:255 (1906), type loc. San 

 Diego, Jones 3050; Jepson, Man. 439 (1925). L. menziesii B. & W. Bot. Cal. 1:46 (1876), at 

 least as to Brewer 27 (Los Angeles), and probably as to Palmer 7 (Guadalupe Isl.). 



13. L. lasiocarpum Nutt. Sand Pepper-grass. Stems several to many from 

 the base, decumbent or ascending, 3 to 6 (or 10) inches long, or the single stem 

 erect and branching a little above the base; herbage hirsutulose or hirsute; leaf- 

 blades obovate to oblanceolate, toothed, incised or less commonly pinnatifid; ra- 

 cemes many; pedicels distinctly flattened, horizontally spreading, 1^2 lines long; 

 sepals broadly oblong, usually purple, with thin white margins; petals minute or 

 none; pods suborbicular, thin-margined near the apex, commonly hispid-pubescent 

 on the margin, hispid-pubescent on the faces or subglabrous; notch at apex of pod 

 shallow, angular or short-linear ; seeds narrowly wing-margined except on the side 

 opposite the cotyledons. 



Sandy flats or valleys, 20 to 2900 feet: coast of Southern California; through 

 the Colorado and Mohave deserts to Inj^o Co. East to Nevada and Texas, and south 

 into Mexico. Mar.-Apr 



Locs. — San Clemente Isl., Peirson 3448 (stems densely hispidulose) ; Santa Rosa Isl., T. 

 Brandegee ; Hueneme, Ventura Co., Peirson 5771; San Diego, Cleveland; Coyote Wells, Colorado 

 Desert, Jepson 11,757; Vallecito, Jepson 8568; Yaqui Well, Jepson 12,512; San Felipe Narrows, 

 C. V. Meyer 29; San Felipe Valley, Jepson 8737; Borrego Spr., Jepson 8890; Indian Canon, Col- 

 lins Valley, Jepson 8828; Heber, Imperial Co., Abrams 3148; Rockwood, Imperial Co., Parish 

 8296; Chuckwalla Mts.; Needles, Parish 9632; Barnwell, K. Brandegee; Cima, San Bernardino 

 Co., K. Brandegee; Rabbit Sprs., Parish 9826; Fremont Peak; Hanaupah Canon, Panamint 

 Range, Jepson 7051; Silver Canon, White Mts., Heller 8215. Tonopah, Nov., ShocUey 80; 

 Fallon, Churchill Co., Nev., Blanche Ross 18. 



Refs.— Lepidium lasiocarpum Nutt.; T. & G. Fl. 1:115 (1838), type loc. Santa Barbara, 

 Nuttall; Jepson, Man. 440 (1925). 



14. L. nitidum Nutt. Common Pepper-grass. California Tongue-grass. 

 stem branching from or near the base, 1 to 16 inches high, the branches mostly 

 simple; herbage glabrous or sparingly pubescent; leaves I/2 to 4 inches long, the 

 blades pinnatifid with the rachis ligulate and bearing entire or laciniately toothed 

 discrete lobes, the terminal lanceolate lobe often enlarged or prolonged; upper 

 leaves often with nearly or quite entire blades, the uppermost often entire; petals 



