Streptanthus oblanceolatus T.W. Nelson & J.P. Nelson
Trinity river jewel-flower
2009 Dana York 2023 Mary Ann Machi 2023 Morgan Stickrod 2023 Mary Ann Machi 2023 Mary Ann Machi 2009 Dana York 2009 Dana York 2009 Dana York 2009 Dana York 2009 Dana York 2009 Dana York 2009 Dana York 2009 Dana York 2023 Mary Ann Machi 2023 Mary Ann Machi 2023 Mary Ann Machi 2022 Ryan O'Dell
Streptanthus oblanceolatus is a perennial herb that is native to California.
California Rare Plant Rank: 1B.2 (rare, threatened, or endangered in CA and elsewhere).
[efloras.org] Description, Range: Biennials; (glaucous), glabrous throughout. Stems: (base woody), virgately branched distally, 5-10 dm. Basal leaves rosulate; petiolate; blade oblanceolate, 3.5-7 cm, margins coarsely dentate distally. Cauline leaves: blade linear-lanceolate, 2-10 cm, (much smaller distally), base auriculate, margins entire. Racemes bracteate below or between proximalmost 1 or 2 flowers, (lax). Fruiting pedicels ascending, 3-6 mm, (strongly expanded at receptacle). Flowers: calyx shape unknown; sepals yellow, 8-9 mm, slightly keeled, (apex acuminate, recurved); petals yellowish, 12-16 mm, blade 4-5 × 0.5-1 mm, (adaxial pair slightly longer), margins not crisped, claw 7-9 mm, wider than blade, (apex recurved); stamens in 3 unequal pairs; filaments: abaxial pair (distinct), 9-11 mm, lateral pair 7-9 mm, adaxial pair (connate distal to middle of their length), 13-16 mm; anthers: abaxial and lateral pairs fertile, 3-3.5 mm, adaxial pair sterile, ca. 1 mm. Fruits divaricate ascending, torulose, flattened, 4-8 cm × 1.5-2 mm; replum straight; ovules per ovary unknown; style to 1 mm; stigma entire. Seeds oblong, ca. 2 × 1 mm; wing distal.
Flowering Jun-Jul. Cliffs and canyon walls in conifer forests; of conservation concern; ca. 400 m; Calif.
Streptanthus oblanceolatus is known from Box Canyon, Trinity River, Trinity County. (contributed by Mary Ann Machi)
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Suggested Citation
Calflora:
Information on California plants for education, research and conservation,
with data contributed by
public and private institutions and individuals.
[web application]. 2023. Berkeley, California:The Calflora Database
[a non-profit organization].Available:
https://www.calflora.org/(Accessed: 12/09/2023).