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Published In: United States Geological Expolration [sic] of the Fortieth Parallel. Vol. 5, Botany 27–28. 1871. (Botany (Fortieth Parallel)) Name publication detailView in BotanicusView in Biodiversity Heritage Library

Project Name Data (Last Modified On 7/23/2009)

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16. Caulanthus pilosus S. Watson, Bot. U.S. Geol. Survey 40th Parallel 5: 27. 1871; Streptanthus pilosus (S. Watson) Jepson, Man. Fl. Pl. Calif. 415. 1925. TYPE: United States, Nevada, Washoe Co., Truckee Valley, 5000 ft, May 1868, S. Watson 113 (lectotype designated by Payons (1923: 289), GH!; isolectotype, NY!).

Thelypodium stamineum Eastwood, Leafl. W. Bot. 2: 7. 1937. TYPE: United States, Nevada, Lander Co., 10 miles E of Battle Mt., 10 Jun 1933, A. Eastwood & J. T. Howell 165b (holotype, CAS!).

Herbs, biennial, moderately to densely pilose with simple trichomes, glaucous. Stems 2–12 dm, erect or ascending, simple or branched, pilose. Basal leaves rosulate; petiole 1–8 cm; blade oblanceolate or oblong in outline, 2–24 x 0.5–9 cm, pilose, pinnatifid to pinnatisect, rarely dentate-sinuate, the lobes dentate; uppermost cauline leaves short petiolate, linear to narrowly oblanceolate, entire or dentate. Racemes with a terminal cluster of sterile flowers, ebracteate or lowermost several flowers bracteate, densely flowered, elongated in fruit; fruiting pedicels ascending, 4–18 mm, glabrous or pilose. Sepals dark purple in bud becoming paler or greenish, narrowly ovate to lanceolate, 4.5–9.5 ´ 1.5–2 mm, erect, equal, not keeled; petals purple, 7–12 mm; blade 3–4 x 1–1.5 mm, crisped; claw oblanceolate to spatulate, 4–9 x 1–2 mm; filaments tetradynamous, free, median pairs 4.5–10 mm, lateral pair 3–8.5 mm; anthers narrowly oblong, 2–3.5 mm, equal; ovules 152–198 per ovary. Fruits 3–16 cm ´ 1–1.5 mm, ascending to divaricate, terete; valves with an obscure midvein; style obsolete or rarely to 1 mm; stigma slightly 2-lobed. Seeds 1–2 x 0.7–1 mm; cotyledons entire.

Flowering: Mar–Jul.

Habitat: flats, rocky slopes, scrub and sagebrush communities, pinyon-juniper woodland.

Elevation: 600–2400 m.

Distribution: United States (NE California, SW Idaho, Nevada, S and E Oregon, W Utah).


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