Tripterocalyx micranthus

(Torrey) Hooker

Hooker’s J. Bot. Kew Gard. Misc. 5: 261. 1853.

Basionym: Abronia micrantha Torrey in J. C. Frémont, Rep. Exped. Rocky Mts., 92. 1843
Treatment appears in FNA Volume 4. Treatment on page 70.

Stems reddish, glandular-pubescent, ± viscid. Leaves: petiole 1–4 cm; blade lance-ovate to elliptic, 1–6 × 0.5–2.5 cm, margins entire or sinuate, ciliate; surfaces short glandular-pubescent, ± viscid, abaxial surface green or glaucous, adaxial surface green. Inflorescences 5–15-flowered; bracts lanceolate to ovate, 3–9 × 1–3 mm, thin and green or ± papery, base ± attenuate, margins glandular-puberulent, often ciliate, or glabrate to lightly glandular-puberulent. Perianth: tube greenish to pink, 6–18 mm, limb greenish to pink, 3–5 mm diam., lobes inconspicuous. Fruits oval to round in profile, 10–20 × 10–20 mm, walls ± spongy on exterior, indurate on interior, ± smooth to rugose; lateral ribs, if extending into wings, only slightly raised; wings (2–)3(–4).

Phenology: Flowering spring–fall.
Habitat: Sandy soils, desert scrub, desert grasslands
Elevation: 800-2400 m


V4 146-distribution-map.gif

Alta., Sask., Ariz., Calif., Colo., Kans., Mont., Nev., N.Mex., N.Dak., S.Dak., Utah, Wyo.


The names Abronia cycloptera A. Gray and Tripterocalyx cyclopterus (A. Gray) Standley are illegitimate, based on an attempt by Gray to rename A. micrantha Torrey. Gray believed A. micrantha to be a “precociously fertilized state” of what is here recognized at T. carneus.

Selected References


Lower Taxa

... more about "Tripterocalyx micranthus"
Leo A. Galloway +
(Torrey) Hooker +
Abronia micrantha +
Alta. +, Sask. +, Ariz. +, Calif. +, Colo. +, Kans. +, Mont. +, Nev. +, N.Mex. +, N.Dak. +, S.Dak. +, Utah +  and Wyo. +
800-2400 m +
Sandy soils, desert scrub, desert grasslands +
Flowering spring–fall. +
Hooker’s J. Bot. Kew Gard. Misc. +
Tripterocalyx micranthus +
Tripterocalyx +
species +