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Streptanthus oblanceolatus
Family:
Brassicaceae
Trinity River Jewelflower
Images
not available
FNA
Resources
Ihsan A. Al-Shehbaz in Flora of North America (vol. 7)
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.
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This project made possible by National Science Foundation Awards
1601697
,
1600981
,
1601393
,
1600976
,
1601429
,
1601101
,
1601503
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