Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California

  • Up-to-date information about California vascular plants is available from the Jepson eFlora.



Richard Spellenberg

Perennial, shrub, tree, glabrous or hairy
Stem often forked
Leaves opposite, sessile or petioled, pairs generally unequal; blade generally entire
Inflorescence generally forked; of spikes, clusters, or umbels, each unit sometimes with a calyx-like involucre
Flower bisexual, radial; perianth of 1 whorl, petal-like, bell- to trumpet-shaped, base hardened, tightly surrounding ovary in fruit, lobes 4–5, generally notched to ± bilateral; stamens 1–many; ovary superior (appearing inferior because of hardened perianth base), style 1
Fruit: achene or nut, smooth, wrinkled, or ribbed
Genera in family: 30 genera, 300 species: warm regions, especially Am; some ornamental (Bougainvillea ; Mirabilis , four o'clock).


Perennial from large taproot
Stem much-branched
Leaf petioled; blade < 8 cm, fleshy, margin often wavy
Inflorescence: head; bracts 5–10, green, flowers blooming sequentially across head; receptacle flat to ± conic, studded with peg-like pedicels
Flower: perianth trumpet-shaped, nocturnal, lobes 4–5; stamens 3–5, included; stigma linear, included
Fruit: wings 3–5, wide, continuous above and below fruit body, thin, transparent, conspicuously net-veined
Species in genus: 3 species: arid North America
Etymology: (Greek & Latin: 3-winged cup, from fruit)
[Galloway 1977 Brittonia 27:328–347] Closely related to Abronia.


T. micranthus (Torr.) Hook.

Stem < 6 dm, glandular-sticky or scabrous
Leaf: blade 1–6 cm, narrowly ovate to elliptic, glabrous to glandular-hairy, hairs denser on lower surface
Flower: perianth 6–18 mm
Fruit: wings glabrous except on edges
Ecology: Dunes
Elevation: 800–2450 m.
Bioregional distribution: se Mojave Desert (Kelso, San Bernardino Co.)
Distribution outside California: to Montana, South Dakota, New Mexico
Flowering time: Apr–May
Synonyms: Abronia m. Torr
Horticultural information: TRY.
See the CNPS Inventory for information about endangerment and rarity.
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bioregional map for TRIPTEROCALYX%20micranthus being generated

Retrieve Jepson Interchange Index to Plant Names entry for Tripterocalyx micranthus
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