13. Caulanthus lasiophyllus (W. J. Hooker & Arnott) Payson, Ann. Missouri Bot. Garden 9: 303. 1923; Turritis lasiophylla W. J. Hooker & Arnott, Bot. Beechey Voy. 321. 1838; Guillenia lasiophylla (W. J. Hooker & Arnott) Greene, Leafl. Bot. Observ. Crit. 1: 227. 1906; Microsisymbrium lasiophyllum (W. J. Hooker & Arnott) O. E. Schulz in Engler, Pflanzenreich IV. 105(Heft 86); 162. 1924; Sisymbrium lasiophyllum (W. J. Hooker & Arnott) K. Brandegee, Zoe 2: 339. 1891; Streptanthus lasiophyllus (W. J. Hooker & Arnott) Hoover, Leafl. W. Bot. 10: 344. 1966; Thelypodium lasiophyllum (W. J. Hooker & Arnott) Greene, Bull. Torrey Bot. Club 13: 142. 1886. TYPE: United States, California, D. Douglas s.n. (holotype, K!).

Erysimum retrofractum Torrey in Wilkes Bot. U.S. Expl. Exped. 17(2); 230. 1874. TYPE: United States, “between the Cascade Mountains and Fort Nisqually” (holotype, US).

Microsisymbrium lasiophyllum var. dasycarpum O. E. Schulz, in Engler, Pflanzenreich IV. 105(Heft 86): 163. 192. TYPE: United States, California, San Diego, 17 Mar 1882, M. E. Jones 2634 (lectotype, here designated, B; isolectotypes, MO!, NY!, POM!).

Microsisymbrium lasiophyllum var. dissectum O. E. Schulz, in Engler, Pflanzenreich IV. 105(Heft 86): 163. 1924. TYPE United States, California, Monterey Co., Gigling Station E of Del Monte, 11 May 1903, A. A. Heller 6709 (lectotype here designated, B; isolectotypes, DS!, MO!, NY!, RM!, UC!).

Microsisymbrium lasiophyllum var. integrifolium O. E. Schulz, in Engler, Pflanzenreich IV. 105(Heft 86): 163. 1924. TYPE: United States, California, Monterey Co., Carmel River, 16 Apr 1903, A. A. Heller 6586 (holotype, B; isotype, DS!, MO!, UC!, US!).

Sisymbrium acuticarpum M. E. Jones, Amer. Naturalist 17: 875. 1883. TYPE: Mexico, “near the head of the Valley of Palms and within a fes miles of the California boundary, 7 Apr 1882, M. E. Jones s.n. (holotype, POM; isotypes, CAS!, DS!).

Sisymbrium deflexum Harvey in Torrey, Pacif. Railr. Rep. Parke, Bot. 4: 66. 1857. TYPE: United States, California, Napa Co., Napa Valley, hillsides, 26 Apr 1854, J. M. Bigelow s.n. (holotype, NY!).

Sisymbrium deflexum var. xerophilum E. Fournier, Recherches Cruciferes 108. 1865. TYPE: United States, California, near San Francisco, anonymous (holotype, P!).

Sisymbrium reflexum Nuttall, J. Acad. Nat. Sci. Philadelphia 1: 183. 1847; Hesperis reflexa (Nuttall) Kuntze, Revis. Gen. Pl. 2: 936. 1891. TYPE: United States, California, San Pedro, W. Gambel s.n. (holotype, not seen).

Thelypodium lasiophyllum var. inalienum B. L. Robinson in A. Gray & S. Watson, Syn. Fl. N. Amer. 1: 177. 1895; Caulanthus lasiophyllus var. inalienus (B. L. Robinson) Payson, Ann. Missouri Bot. Gard. 9: 306. 1923; Guillenia inaliena (B. L. Robinson) Greene, Leafl. Bot. Observ. Crit. 1: 228. 1906; Microsisymbrium lasiophyllum var. inalienum (B. L. Robinson) O. E. Schulz in Engler, Pflanzenreich IV. 105(Heft 86): 163. 1924; Streptanthus lasiophyllus var. inalienus (B. L. Robinson) Hoover, Leafl W. Bot. 10: 345. 1966. TYPE: United States, California, back of Santa Barabara and Los Angeles, 1860, W. H. Brewer 194 (lectotype, here designated, GH!).

Thelypodium rigidum Greene, Pittonia 1: 62. 1887; Caulanthus lasiophyllus var. rigidus (Greene) Payson, Ann. Missouri Bot. Gard. 9: 307. 1923; Guillenia rigida (Greene) Greene, Leafl. Bot. Observ. Crit. 1: 228. 1906; Microsisymbrium lasiophyllum var. rigidum (Greene) O. E. Schulz in Engler, Pflanzenreich IV. 105(Heft 86): 163. 1924; Streptanthus rigidus (Greene) Hoover, Leafl. W. Bot. 10: 345. 1966; Thelypodium lasiophyllum var. rigidum (Greene) B. L. Robinson in A. Gray & S. Watson, Syn. Fl. N. Amer. 1: 177. 1895. TYPE: United States, California, “fields about Antioch on the lower Sacramento,” 17 Apr 1887, E. L. Greene s.n. (holotype, NDG!).

Thelypodium utahense Rydberg, Bull. Torrey Bot. Club 29: 233. 1902; Caulanthus lasiophyllus var. utahensis (Rydberg) Payson, Ann. Missouri Bot. Gard. 9: 307. 1923;  Streptanthus lasiophyllus var. utahensis (Rydberg) Hoover, Vasc. Pl. San Luis Obisop Co., Calif. 147. 1970; Thelypodium lasiophyllum var. utahense (Rydberg) Jepson, Man. Fl. Pl. Calif. 413. 1925. TYPE: United States, Utah, Washington Co., St. George, 2000 ft, 9 Apr 1880, M. E. Jones 1648 (holotype, NY!; isotypes, GH!, MO!, NY!, POM!).

Herbs, annual, sparsely to densely hispid or hirsute, rarely subglabrous. Stems (0.8–)2–10(–16) dm, erect, simple or branched above, at least sparsely hirsute near base. Basal leaves soon withered; middle and lower cauline leaves with petioles 0.5–3 cm; leaf blade lanceolate to oblong or oblanceolate, pinnatifid, 2–12 x 0.5–5 cm, lateral lobes dentate or entire; upper leaves gradually reduced in size and often less divided upwards. Racemes without a terminal cluster of sterile flowers, ebracteate, elongated considerably in fruit; fruiting pedicels strongly reflexed or sometimes spreading, (0.7–)1–2.2(–3) mm, slender or thickened. Sepals oblong, 2–4 ´ 0.7–1 mm, erect, not saccate, not forming an urceolate calyx; petals white to creamy white or rarely pinkish, narrowly oblanceolate, 2.5–5(–6.5) ´ 0.9–1.1 mm, neither channeled nor crisped; claw undifferentiated; filaments slightly tetradynamous, free, median pairs 3–4.5 mm; anthers ovate, 0.4–0.7 mm; ovules 14–60 per ovary. Fruits linear, 2–4.8(–5.7) cm ´ 0.7–1.2 mm, terete, subtorulose or not, straight to slightly curved; valves glabrous or sparsely pubescent; style 0.5–2 mm; stigma subentire. Seeds brown, oblong, 0.9–1.5 ´ 0.6–1 mm. 2n = 28.

Flowering: Mar –May.

Habitat: desert flats, gravelly areas, limestone rocks, talus slopes, shrub communities, hillsides, sandy banks, disturbed sites, grassy fields, ravines.

Elevation: 0–1350 m.

Distribution: Mexico (Baja California, Sonora), United States (California, Arizona, Nevada, New Mexico, Oregon, Utah, Washington).