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Caulanthus heterophyllus (Nutt.) Payson

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11. Caulanthus heterophyllus (Nuttall) Payson, Ann. Missouri Bot. Gard. 9: 298. 1923; Streptanthus heterophyllus Nuttall in Torrey & A. Gray, Fl. N. Amer. 1: 77. 1838; Guillenia heterophylla (Nuttall) O. E. Schulz, Bot. Jahrb. Syst. 66: 98. 1933. TYPE: United States, California, Sand Diego, T. Nuttall s.n. (holotype, BM!).

Caulanthus stenocarpus Payson, Ann. Missouri Bot. Gard. 9: 300. 1923. TYPE: United States, California, San Diego Co., dry hillsides near Bernardo, 1 May 1903, L. Abrams 3364 (holotype, MO!; isotypes, DS!, GH!, NY!).

Streptanthus repandus Nuttall in Torrey & A. Gray, Fl. N. Amer. 1: 77. 1838. TYPE: United States, California, Santa Barbara, T. Nuttall s.n. (holotype, BM!).

Herbs, annual, hispid with simple trichomes, subglabrous above, glaucous. Stems 2.5–12 dm, erect, often branched above, hispid. Basal leaves weakly rosulate; petiole 0.3–3 cm; blade linear-oblanceolate to linear-oblong, 0.7–7 x 0.2–1.8 cm, hispid, margin coarsely dentate or pinnately lobed; middle cauline leaves sessile, linear-lanceolate, 5–16 x 0.5–4 cm, gradually reduced in size upwards, base amplexicaul to sagittate, margin dentate, entire in uppermost leaves. Racemes without a terminal cluster of sterile flowers, ebracteate, densely flowered, elongated in fruit; fruiting pedicels reflexed, 2–8 mm, glabrous or hispid. Sepals purple or yellow to creamy white, lanceolate, 3–8 ´ 1–1.8 mm, erect, equal, not keeled; petals purple or yellowish, often with darker purple veins, 5–15 mm; blade 2–6 x 1–1.5 mm, not crisped; claw narrowly oblanceolate or oblong, 3–9 x 1–1.5 mm; filaments tetradynamous, free, median pairs 3–6 mm, lateral pair 2–5 mm; anthers oblong, 1–3 mm; ovules 56–82 per ovary. Fruits 4.5–10 cm ´ 1–1.5 mm, reflexed, latiseptate or 4-angled, often straight or rarely curved; valves with a prominent midvein; style 0.5–3.5 mm; stigma slightly 2-lobed. Seeds 1.2–2 x 0.9–1.4 mm; cotyledons entire.

Flowering: Mar–May.

Habitat: coastal scrub, chaparral, rocky areas.

Elevation: 0–1400 m.

Distribution: Mexico (Baja California), United States (SW California).