Thelypodium stenopetalum
Proc. Amer. Acad. Arts 22: 468. 1887.
Biennials; glaucous, glabrous (except petioles). Stems (often decumbent), branched basally, sometimes also distally, (2.6–) 3–8 (–9) dm. Basal leaves: petiole 1–4.5 (–6) cm, ciliate; blade often oblong or lanceolate, sometimes ovate to spatulate, 3.8–15 (–18) cm × 15–35 (–42) mm, margins usually entire, rarely repand. Cauline leaves (ascending); sessile; blade usually lanceolate to oblong, rarely linear to linear-lanceolate, (1.3–) 1.6–4.8 (–6) cm × (3–) 5–9 (–15) mm, (base usually amplexicaul to sagittate, rarely auriculate), margins entire. Racemes lax, elongated in fruit, (flower buds oblong-linear). Fruiting pedicels usually ascending to divaricate-ascending, rarely horizontal or divaricate, usually straight, rarely slightly incurved, stout, (3.5–) 4–8 mm, not flattened at base. Flowers: sepals erect, linear to linear-oblong, (6–) 6.5–9 (–10) × 1–1.5 (–1.8) mm; petals usually lavender, rarely white, linear, (8–) 9.5–15 (–16.5) × 0.3–0.5 (–0.8) mm, margins crisped between blade and claw, claw differentiated from blade, [slender, 4–6.5 (–8.5) mm, narrowest at base]; nectar glands confluent, subtending bases of stamens; filaments slightly tetradynamous, median pairs (7–) 8–12.5 (–14) mm, lateral pair (5.5–) 7–11 (–12) mm; anthers exserted, linear to narrowly oblong, 3.5–5 (–6) mm, circinately coiled; gynophore stout, 0.5–3.5 (–5) mm. Fruits usually divaricate-ascending to ascending, rarely divaricate, slightly torulose, straight or slightly incurved, terete or slightly 4-angled, (2.2–) 2.8–5 (–6.3) cm × 1–1.5 (–1.8) mm; ovules 50–82 per ovary; style cylindrical, 1–2 (–2.5) mm. Seeds 1–1.3 (–1.5) × 0.7–0.8 mm.
Phenology: Flowering May–Aug.
Habitat: Alkaline meadows and flats
Elevation: 1900-2100 m
Discussion
Of conservation concern.
Thelypodium stenopetalum is known from Bear Valley, San Bernardino County.
Selected References
None.
Lower Taxa
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