Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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James C. Hickman

Annual to trees, some dioecious
Stem: nodes often swollen
Leaves simple, basal or cauline, alternate, opposite, or whorled, generally entire; stipules 0 or obvious and fused into a generally scarious sheath around stem
Inflorescence: small cluster, axillary or arrayed in cymes or panicles; involucres sometimes subtending 1–many flowers
Flower generally bisexual, small, ± radial; perianth generally 5–6-lobed, base ± tapered, often jointed to pedicel; stamens 2–9, often in 2 whorls; ovary superior, styles generally 3, generally fused at base
Fruit: achene, generally enclosed by persistent perianth, generally 3-angled, ovoid, and glabrous
Genera in family: 50 genera, 1100 species: worldwide, especially n temp; some cultivated for food (Fagopyrum ; Rheum , rhubarb; Rumex , sorrel) or ornamental (Antigonon , coral-vine; Muehlenbeckia ; Polygonum )
Reference: [Ronse Decraene & Akeroyd 1988 Bot J Linn Soc 98:321–371; Reveal et al. 1989 Phytologia 66(2–4):83–414]
Treatments of the 15 eriogonoid genera are based on the monographic work of James L. Reveal, who is gratefully acknowledged.


Annual, glandular
Leaves basal; stipule 0; petiole indistinct; blade oblanceolate
Inflorescence open; bract 1 per node, 5–25 mm, lobes 3, awned; involucre generally 1 per node, sessile, cylindric, lobes 2–4, awned, awns straight, often unequal; flower generally 1 per involucre
Flower: perianth white to pink, hairy, lobes 6; stamens 6–9
Fruit 2–3 mm, lanceolate in outline, brown to black
Species in genus: 2 species: CA
Etymology: (Latin: sharp-pointed, from bracts)
Reference: [Reveal 1989 Phytologia 66:199–220]


M. californica Benth.


Plant 3–50 cm; non-glandular hairs ± sparse
Leaf generally 10–30 mm
Inflorescence: bracts on 1 side of stem, generally 5–12 mm, generally lobed > halfway to base; involucre 1 per node (2 smaller involucres often on a short axillary branch), 2–9 mm, ± radial, lobes generally 3, awns generally ± 2 mm; flowers 1–2 per involucre
Flower: perianth lobes entire
Chromosomes: n=19
Ecology: Coastal scrub, chaparral, in sandy soils
Elevation: < 1400 m.
Bioregional distribution: s Central Western California, Southwestern California
Synonyms: Chorizanthe c. (Benth.) A. Gray; C. c. var. suksdorfii J.F. Macbr
See the CNPS Inventory for information about endangerment and rarity.
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bioregional map for MUCRONEA%20californica being generated
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Mucronea californica
Retrieve dichotomous key for Mucronea
Retrieve multiple-entry key (MEKA) for Mucronea
Overlay Consortium of California Herbaria specimen data by county on this map
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