Thelypodium laxiflorum

Biennials; somewhat glaucous, glabrous throughout or pubescent basally. Stems branched distally, (1.5–) 3–14 (–23.5) dm, (glabrous throughout or sparsely to densely hirsute proximally). Basal leaves (and proximal cauline): petiole (1–) 1.7–8 (–11) cm, pubescent or glabrous; blade oblanceolate in outline (lateral lobes usually oblong to linear, rarely deltate), (4–) 7.2–20.5 (–30) cm × (6–) 10–40 (–100) mm, margins pinnately lobed or lyrate (lobes entire or dentate). Cauline leaves petiolate; blade usually lanceolate to linear, sometimes oblanceolate to oblong, 1.5–7 (–10) cm × 3–12 (–20) mm, margins usually entire or repand, rarely lobed. Racemes corymbose, somewhat lax, considerably elongated in fruit. Fruiting pedicels often divaricate, sometimes reflexed, rarely horizontal or divaricate-ascending, straight, slender, (4–) 5–13 (–19) mm, somewhat flattened at base. Flowers: sepals (equal), ascending, oblong, (2.5–) 3–5 (–5.5) × 1–1.7 (–3) mm, (lateral pair not saccate); petals usually white, rarely lavender, usually spatulate, rarely obovate, 5–7.5 (–9.5) × 1.5–2.5 (–3.5) mm, margins not crisped, claw obscurely differentiated from blade (widest at base); nectar glands continuous, flat, subtending bases of stamens; filaments tetradynamous, median pairs 3–4.5 (–5.5) mm, lateral pair 2.5–3.5 (–4.5) mm; anthers included, oblong, (1–) 1.5–2.2 (–2.5) mm, not circinately coiled; gynophore 0.5–0.8 (–1.5) mm. Fruits divaricate to reflexed, submoniliform to strongly torulose, straight or curved, terete, (2–) 3–6.6 (–7.4) cm × 0.7–1 (–1.5) mm, (replum constricted between seeds); ovules 26–62 per ovary; style usually clavate to subclavate, rarely cylindrical, (0.5–) 0.8–2 (–5) mm. Seeds (oblong), (1–) 1.3–1.8 (–2) × 0.5–1 mm.

Phenology: Flowering May–Sep.
Habitat: Talus, rocky slopes, cliffs, pinyon-juniper-brush communities
Elevation: 1500-3100 m

Colo., Nev., Utah.

Discussion

Selected References

None.

Lower Taxa