|Jepson Flora Project: Jepson Interchange|
|TREATMENT FROM THE JEPSON MANUAL (1993)||
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
AND IS MAINTAINED FOR ARCHIVAL PURPOSES ONLY
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 1many flowers
Flower generally bisexual, small, ± radial; perianth generally 56-lobed, base ± tapered, often jointed to pedicel; stamens 29, 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 98:321371; Reveal et al. 1989 Phytologia 66(24):83414]
Treatments of the 15 eriogonoid genera are based on the monographic work of James L. Reveal, who is gratefully acknowledged.
Annual, perennial herb, glabrous or hairy, sometimes glandular
Stem generally scapose (made up of inflorescence axes)
Leaves basal (rarely some cauline); stipule 0; blade generally ± oblanceolate
Inflorescence open or of few heads, sometimes 1-sided; bracts generally opposite, leaf-like to scale-like; involucres 1several per axil, sessile, tube cylindric to bell-shaped, generally ± cross-ridged or net-veined, bracts (and ribs) 36, awns straight or hooked; flowers 12 per involucre
Flower: perianth white to red or yellow, lobes 6, entire to fringed or toothed; stamens 39
Fruit 1.54.5 mm, generally ± brown, glabrous
Species in genus: 50 species: temp w North America, sw South America
Etymology: (Greek: divided flower, from perianth)
Reference: [Reveal & Hardham 1989 Phytologia 66(2):98198]
Stem prostrate to ascending, 230 cm, strigose
Leaf: blade 540 mm, oblanceolate to oblong
Inflorescence: involucral tube 1.52 mm, urn-shaped, canescent, bracts 6, awns straight or hooked
Flower: perianth 2.53 mm, white, sparsely hairy, lobes equal or not, generally nearly entire; stamens 9
Ecology: Uncommon. Sandy places, generally in coastal or desert scrub
Elevation: 2001200 m.
Bioregional distribution: South Coast, e Transverse Ranges, nw edge Sonoran Desert.
See the CNPS Inventory for information about endangerment and rarity.
Inflorescence: involucral awns straight
Flower: perianth lobes ± equal.
Ecology: Habitat of sp.
Elevation: 200350 m.
Bioregional distribution: South Coast, eastern Western Transverse Ranges, San Gabriel Mountains.Extirpated from Los Angeles Basin; recently found in eastern Ventura Co.