Tropicos | Name - Caulanthus flavescens (Hook.) Payson

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Caulanthus flavescens (Hook.) Payson

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8. Caulanthus flavescens (W. J. Hooker) Payson, Ann. Missouri Bot. Gard. 9: 301. 1923; Streptanthus flavescens W. J. Hooker, Icones 1: t. 44. 1837; Guillenia flavescens (W. J. Hooker) Greene; G. hookeri (Greene) Greene, Leafl. Bot. Observ. Crit. 1 : 228. 1906; Thelypodium flavescens (W. J. Hooker) S. Watson, Bot. U.S. Geol. Survey 40th Parallel 5: 25. 1871; T. flavescens (W. J. Hooker) Jepson, Fl. W. Calif. 212. 1901, comb. superfl.; T. hookeri Greene, Fl. Francisc. 263. 1891. TYPE: United States, California, Monterey, 1933, D. Douglas s.n. (K!; isotype, NY!).

Streptanthus procerus Brewer ex A. Gray, Proc. Amer. Acad. Arts 1 : 519. 1865; Caulanthus procerus (Brewer) S. Watson, Bot. U.S. Geol. Survey 40th Parallel 5: 25. 1871. TYPE: United States, California, coal mine near Mount Diablo, 1860, W. H. Brewer 1127 (holotype, GH!).

Streptanthus dudleyi Eastwood, Proc. Calif. Acad. Sci. IV, 20: 145. 1931. TYPE: United States, California, San Benito Co., headwaters of Bitterwater Creek, 24 Feb 1929, C. Dudley s.n. (holotype, CAS !).

Streptanthus lilacinus Hoover, Leafl. W. Bot. 1: 226. 1936. TYPE: United States, California, Alameda Co., central part of Corral Hollow, 7 Apr 1935, A. Eastwood & J. T. Howell 2111 (holotype, CAS !).

Thelypodium greenei Jepson, Fl. W. Calif. 212. 1901. TYPE: United States, California, .. (holotype, xx).

Herbs, annual, glabrous or sparsely to moderately hirsute. Stems 1.7–12 dm, erect, simple or branched above, usually hirsute near base. Basal leaves soon withered, lyrate to sinuate-pinnatifid, middle cauline leaves with petioles 0.3–2 cm; leaf blade lanceolate to oblong or oblanceolate, dentate, 2–13.5 x 0.3–3.5 cm; upper leaves gradually reduced in size, sessile and sometimes subauriculate at base. Racemes without a terminal cluster of sterile flowers, ebracteate, elongated considerably in fruit; fruiting pedicels ascending to strongly reflexed, 4.5–8 mm, slender or thickened., curved, glabrous or sparsely pubescent. Sepals oblong, 6–9 ´ 1.5–2 mm, erect or ascending to spreading, neither saccate nor urceolate; petals white to creamy white or rarely pinkish, narrowly lanceolate, 7–13 mm, erect, channeled, crisped; blade 3–5 ´ 1–1.5 mm; claw linear-oblanceolate, 4–8 ´ 1–1.7 mm; filaments tetradynamous, free, median pairs 5–7 mm, erect; anthers narrowly oblong, 1.5–2.5 mm; ovules 44–58 per ovary. Fruits linear, 3.8–7.7 cm ´ 1.4–2 mm, terete, straight; valves glabrous or sparsely pubescent; style 1–3.5 mm; stigma subentire. Seeds brown, oblong, 1.3–1.8 ´ 0.9–1.2 mm. 2n = 28.

Flowering: Mar–May.

Habitat: serpentine grounds, roadsides, gumbo clay slopes, open hillsides, grassy fields.

Elevation: 200–700 m.

Distribution: United States (WC California).