Thelypodiopsis ambigua

(S. Watson) Al-Shehbaz

Contr. Gray Herb. 204: 138. 1973.

EndemicConservation concern
Basionym: Thelypodium ambiguum S. Watson Proc. Amer. Acad. Arts 14: 290. 1879
Synonyms: Sisymbrium ambiguum (S. Watson) Payson Thelypodiopsis ambigua var. erecta Rollins
Treatment appears in FNA Volume 7. Treatment on page 725. Mentioned on page 724.

Annuals or biennials; (glaucous), glabrous throughout. Stems branched distally, (3–)5–10 dm. Basal leaves rosulate; petiole 0.3–3 cm; blade oblanceolate, (1.5–)2.5–14.5(–20) cm × 10–30(–42) mm, margins dentate to subpinnatifid. Cauline leaves sessile; blade lanceolate to oblong, base auriculate, margins usually entire, rarely dentate. Racemes lax or dense. Fruiting pedicels horizontal to divaricate-ascending, often upcurved, 6–9 mm. Flowers: sepals erect, purple, 5–7.5 × 1.7–2.5 mm; petals purple to lavender or white, spatulate, 10–14 × 1.2–1.7 mm, claw 4–6 mm; median filament pairs 4–6 mm; anthers linear, 3–4 mm; gynophore (slender), 3–6(–9.5) mm. Fruits ascending to divaricate or descending, straight or slightly recurved, torulose, 4.5–9 cm × 1.1–1.4 mm; ovules 80–112 per ovary; style cylindrical, (stout), 0.3–1 mm; stigma 2-lobed. Seeds 1.2–1.5 × 0.8–1.2 mm. 2n = 22.

Phenology: Flowering Mar–Jun.
Habitat: Pinyon-juniper desert shrub communities, dry hillsides
Elevation: 800-1600 m


Of conservation concern.

Thelypodiopsis ambigua is known from Kane County in Utah and from Coconino, Mohave, and Yavapai counties in Arizona.

Selected References


Lower Taxa

... more about "Thelypodiopsis ambigua"
Ihsan A. Al-Shehbaz +
(S. Watson) Al-Shehbaz +
Thelypodium ambiguum +
Ariz. +  and Utah. +
800-1600 m +
Pinyon-juniper desert shrub communities, dry hillsides +
Flowering Mar–Jun. +
Contr. Gray Herb. +
Endemic +  and Conservation concern +
Sisymbrium ambiguum +  and Thelypodiopsis ambigua var. erecta +
Thelypodiopsis ambigua +
Thelypodiopsis +
species +