Thelypodium laxiflorum


Contr. Gray Herb. 204: 129, plate 22A. 1973.

Synonyms: Stanleyella wrightii var. tenella (M. E. Jones) Payson Thelypodium wrightii var. tenellum M. E. Jones
Treatment appears in FNA Volume 7. Treatment on page 735. Mentioned on page 729.

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


Selected References


Lower Taxa

... more about "Thelypodium laxiflorum"
Ihsan A. Al-Shehbaz +
Al-Shehbaz +
Pachypodium +
Colo. +, Nev. +  and Utah. +
1500-3100 m +
Talus, rocky slopes, cliffs, pinyon-juniper-brush communities +
Flowering May–Sep. +
Contr. Gray Herb. +
Stanleyella wrightii var. tenella +  and Thelypodium wrightii var. tenellum +
Thelypodium laxiflorum +
Thelypodium +
species +