|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 to shrub
Leaves generally ± basal (clustered on low stems or cauline), petioled, generally ± tomentose below (often shedding above); stipule 0
Inflorescence openly cyme-like, umbel-like, or head-like, generally ± scapose; bracts (any whorled, leaf-like structures on inflorescence) 3many per node, leaf-like to scale-like; involucres generally 1 per node, generally ± obconic, lobes (or short teeth) generally 310, generally erect; flowers generally many per involucre, pedicelled
Flower: perianth white, yellow, or red, lobes 6, generally ± oblong to obovate; stamens 9
Fruit brown to black, glabrous to hairy
Species in genus: ± 250 species: North America
Etymology: (Greek: woolly knees, from hairy nodes of some)
Reference: [Reveal 1989 Phytologia 66:295414]
Largest dicot genus in CA; apparently currently differentiating; many taxa ± indistinct. Better habitat data needed. Many are excellent bee fodder
Horticultural information: Most are attractive and easy to grow with good drainage.
[Group 4] Perennial 1535 cm; mats 340 cm diam
Leaves ± basal on dense caudex; petiole long, slender; blade 260 mm, elliptic to ± round, tomentose to woolly
Inflorescence generally head-like, < 30 cm; bracts scale-like, ± hidden; involucres 115 per head, 26.5 mm, rigid, hairy, teeth 5
Flowers sometimes unisexual; perianth 2.57 mm, white to purple or yellow, glabrous, outer lobes obovate to round, inner narrower, generally notched, stalk-like base 0
Fruit 23 mm, glabrous
Ecology: Common. Dry sand or gravel
Elevation: 12004100 m.
Bioregional distribution: Klamath Ranges, High Cascade Range, High Sierra Nevada, ne San Bernardino Mountains, Great Basin Floristic Province, Desert Mountains
Distribution outside California: to s Canada, Montana, Colorado, New Mexico
Varieties ± intergrade.
Leaf: blade 1060 mm, generally ± obovate, ± unmargined
Inflorescence: axis 420 cm; involucres 315, 46.5 mm
Flower: perianth generally 46 mm, yellow
Ecology: Common. Sand or gravel
Elevation: 12002900 m.
Bioregional distribution: High Sierra Nevada (eastern slope), Great Basin Floristic Province, Desert Mountains
Distribution outside California: to Oregon, Montana, Colorado
Flowering time: MayJul
Intergrades with and difficult to distinguish from E. strictum var. anserinum
Horticultural information: DRN, SUN: 1, 2, 3, 7, 15, 16, 17, 22, 23, 24.