MUSTARD FAMILY 83 



Locs. — At first occasional in the San Francisco Bay region (Oak Knoll, Napa Valley, Jepson 

 13,398 in 1893; Menlo Park, John T. Doyle in 1901) and in coastal Southern California (Ventura 

 Co., ace. Cal. Com. Hort. Mo. Bull. 8:79; Chino and Huntington Beach, ace. Bull. S. Cal. Acad. 

 19*: 17; Pomona, Mum 6914; Santa Ana, E. Johnson), in later years it became established as a 

 dangerous weed in Santa Cruz Co. (Watsonville, C. C. Way, where known aa "Hell Weed" and 

 "Italian Horse Kadish") and thoroughly naturalized in Siskiyou Co. as a serious agricultural pest 

 (Yreka, W. L. Eleaver in 1915, Butler 725). In the last decade it has continued steadily to spread. 

 In moist fields in the south end of the Santa Clara Valley near Gilroy it forms dense colonies 5 to 

 30 feet wide, which at a little distance resemble patches of white-flowered Umbelliferae persistent 

 after cultivation. It recurs at intervals on the Bolsa towards Hollister (Jepson 16,114 in 1932) 

 and is very abundant in valley fields in the region of Paicines (Jepson 15,414 in 1930). In 1932 

 it was observed in fields about Los Banos, western Stanislaus Co.; also near Firebaugh, Fresno 

 Co. (Jepson 16,248) ; and again near San Gregorio, San Mateo Co. (E. K. Crum). 



Var. repens ThcU. Pods orbicular to rhomboidal, obtuse or acute at base, glabrous, 2 to 2^4 

 lines long. — Native of Asia, naturalized at scattered stations: Chino, San Bernardino Valley, 

 Johnston 1849 in 1918; Westminster, Orange Co., E. Johnson in 1931; Aromas, Monterey Co., 

 Hickman in 1923 ; San Joaquin Co., Bellue 4" Mahoney in 1932. 



Kefs. — Lepidium draba L. Sp. PI. 645 (1753), type European; Jepson, Fl. W. Mid. Cal. 226 

 (1901), ed. 2, 192 (1911), Man. 438 (1925). Var. repens Thell. Mitteil. Bot. Mus. Univ. Ziirich 

 28:89 (1906). Physolepidion repens Schr. Enum. PI. Nov. 97 (1841), type from India. L. repens 

 Boiss. Fl. Orient. 1:356 (1867). 



3. L. campestre R. Br. Poor-man's Pepper. Annual or biennial; stems 1 or 

 several from the base, simple, erect, very leafy up to the inflorescence, 9 to 14 

 inches high; herbage hoary-pubescent; blades of cauline leaves oblong, mostly 

 sagittate-clasping, denticulate, crowded, 1 to 3I/2 inches long; blades of basal 

 leaves pinnately lobed, long-petioled; pedicels horizontally spreading, equaling or 

 a little shorter than the pods; petals white; pods broadly ovate, thick, squamulose, 

 winged all around, 2i/^ lines long; style scarcely exserted from the narrow notch 

 at apex. 



European species, locally established in the Lake Tahoe region. 



Locs. — Deer Park Inn, Placer Co., H. A. Walher 2027; Donner Lake, K. Brandegee. 



Eefs. — LEPrDixXM campestre K. Br.; Ait. f. Hort. Kew. ed. 2, 4:88 (1812), type European; 

 Jepson, Man. 438 (1925). 



4. L. perfoliatum L. Shield Cress. Annual; stem erect and simple, or 

 diffusely branching, 1 to 2 feet high; lower leaves petioled, their blades finely bi- 

 pinnatifid with linear lobes % to 4 lines long; blades of upper leaves round- 

 ovate, cordate-clasping, entire; pedicels spreading; petals yellow; capsule rhombic- 

 orbicular, minutely notched. 



Introduced from Europe, sparingly but wddely naturalized. 



Locs. — Orange, E. H. Holland; HollyAvood (Bull. S. Cal. Acad. 19*: 17) ; Eedman, w. Mohave 

 Desert, Ralph Hoffman; Firebaugh, Fresno Co., Jepson 16,252; Hollister; Summit Eock, Santa 

 Cruz Mts., Pendleton 947; Sonoma, R. Kuhn; Truckee Eiver at Lake Tahoe, Helen Geis 199; 

 Yreka, L. T. Dempster 1003. Nev. : Carson City, K. Brandegee. 



Eefs. — Lepidiitm PERFOLiATUir L. Sp. PI. 643 (1753), type from the Orient; Parish, BulL 

 S. Cal. Acad. 14:14 (1915) ; Jepson, Man. 438 (1925). 



5. L. montanum Nutt. Bronco Pepper. Biennial; stem corymbosely branch- 

 ing above or rarely from the base, 10 to 14 inches high; herbage minutely puberu- 

 lent to shortly hirsute; blades of leaves pinnately incised or parted, % to 1% inches 

 long, the segments ovate to oblong or linear, sometimes again incisely cleft or 

 toothed, 1/2 to 2 or 3 lines long; blades of upper leaves toothed or rarely entire; 

 flowers in dense racemes; petals white; pods elliptic, varying to ovatish or orbicu- 

 lar, obscurely or slightly notched at apex, 1 to V/^ lines long, on spreading pedicels 

 twice as long. 



Mountain valleys, 2500 to 5000 feet : Siskiyou Co.; rare in California. North to 

 Oregon, east to Colorado, Arizona and Texas. Apr. 



Locs.— Grenada, Siskiyou Co., Heller 8068 ; Pit Eiver s. of Alturas, R. M. Austin (herbage 

 slightly puberulent or subglabrous). 



