Caulanthus pilosus

S. Watson

Botany (Fortieth Parallel), 27. 1871

Synonyms: Streptanthus pilosus (S. Watson) Jepson Thelypodium stamineum Eastwood
Treatment appears in FNA Volume 7. Treatment on page 684. Mentioned on page 678, 685.
Biennials; moderately to densely pilose. Stems erect or ascending, unbranched or branched distally, 2–12 dm. Basal leaves rosulate; petiole 1–8 cm; blade oblanceolate or oblong (in outline), 2–24 cm × 5–90 mm, margins usually pinnatifid to pinnatisect, rarely dentate-sinuate (lobes dentate). Cauline leaves (distalmost) shortly petiolate; blade linear to narrowly oblanceolate, margins entire or dentate. Racemes (densely flowered), without a terminal cluster of sterile flowers, (sometimes proximalmost flowers bracteate). Fruiting pedicels ascending, 4–18 mm, glabrous or pilose. Flowers: sepals erect, (dark purple in bud becoming paler or greenish), narrowly ovate to lanceolate, 4.5–9.5 × 1.5–2 mm, (equal); petals purple, 7–12 mm, blade 3–4 × 1–1.5 mm, crisped, claw oblanceolate to spatulate, 4–9 × 1–2 mm; filaments tetradynamous, median pairs 4.5–10 mm, lateral pair 3–8.5 mm; anthers narrowly oblong, equal, 2–3.5 mm. Fruits ascending to divaricate, terete, 2–18 cm × 1–1.5 mm; valves each with obscure midvein; ovules 152–198 per ovary; style obsolete or, rarely, to 1 mm; stigma slightly 2-lobed. Seeds 1–2 × 0.7–1 mm.

Phenology: Flowering late Mar-early Jul.
Habitat: Flats, rocky slopes, scrub and sagebrush communities, pinyon-juniper woodland
Elevation: 600-2800 m


V7 1177-distribution-map.gif

Calif., Idaho, Nev., Oreg., Utah.


Caulanthus pilosus is found in northeastern California, southwestern Idaho, Nevada, eastern and southern Oregon, and western Utah.

Selected References


Lower Taxa


Facts about "Caulanthus pilosus"
AuthorIhsan A. Al-Shehbaz +
AuthorityS. Watson +
DistributionCalif. +, Idaho +, Nev. +, Oreg. + and Utah. +
Elevation600-2800 m +
HabitatFlats, rocky slopes, scrub and sagebrush communities, pinyon-juniper woodland +
Illustration copyrightFlora of North America Association +
IllustratorYevonn Wilson-Ramsey +
PhenologyFlowering late Mar-early Jul. +
Publication titleBotany (Fortieth Parallel), +
Publication year1871 +
ReferenceNone +
Source xml grained fna xml/V7/V7 1177.xml +
SynonymsStreptanthus pilosus + and Thelypodium stamineum +
Taxon familyBrassicaceae +
Taxon nameCaulanthus pilosus +
Taxon parentCaulanthus +
Taxon rankspecies +
VolumeVolume 7 +