2. Caulanthus anceps Payson, Ann. Missouri Bot. Gard. 9: 302. 1923; Thelypodium lemmonii Greene, West Amer. Sci. 3: 156. 1887, not Caulanthus lemmonii S. Watson, Proc. Amer. Acad. Arts 23: 261. 1888; Streptanthus anceps (Payson) Hoover, Leafl. W. Bot. 10: 344. 1966. TYPE: United States, California, San Luis Obispo Co., Lemmon’s Ranch, Mr. and Mrs. J. G. Lemmon s.n. (holotype, not seen).

Herbs, annual, sparsely to densely hirsute. Stems 3.5–15 dm, erect, simple or branched above or rarely at base, at least sparsely hirsute near base. Basal leaves soon withered; middle cauline leaves with petioles 0.4–3 cm; leaf blade lanceolate to oblong, dentate, 1.5–9.5 x 0.3–3 cm;; upper leaves gradually reduced in size, denticulate to subentire. Racemes without a terminal cluster of sterile flowers, ebracteate, elongated considerably in fruit; fruiting pedicels strongly reflexed, 3–10 mm, slender or thickened. Sepals oblong, 3.5–5.5 ´ 1–1.7 mm, spreading, neither saccate nor urceolate; petals white to lavender, 4–8 ´ 2–4 mm, spreading, neither channeled nor crisped, undifferentiated into blade and claw; filaments subequal, 3.5–5 mm, spreading; anthers narrowly oblong, 1.5–2 mm, coiled after dehiscence; ovules 40–54 per ovary. Fruits linear, 3–6.7 cm ´ 1.2–2 mm, terete, not torulose, straight, erect or reflexed; valves glabrous or rarely sparsely pubescent; style 1–4 mm, subconical or cylindrical; stigma subentire. Seeds brown, oblong to ovoid, 1.4–1.8 ´ 1–1.3 mm.

Flowering: Mar–May.

Habitat: grassy slopes, open flats, roadsides, fields, hillsides.

Elevation: 600–1700 m.

Distribution: United States (SW California).