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

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

POLYGONACEAE

BUCKWHEAT FAMILY

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.

ERIOGONUM

WILD BUCKWHEAT

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) 3–many per node, leaf-like to scale-like; involucres generally 1 per node, generally ± obconic, lobes (or short teeth) generally 3–10, 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 66:295–414]
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.

Native

E. breedlovei (J.T. Howell) Reveal

[Group 4] Perennial generally < 10 cm; mats 8–20 cm diam
Leaves ± basal on branched caudex; blade 2–10 mm, elliptic, white-woolly below, gray-tomentose above
Inflorescence densely umbel-like, sometimes ± compound; bracts scale-like; involucres ± few, slender-stalked, 2.5–4 mm, rigid, angled, teeth 7–9, becoming incurved
Flower: perianth 2–4 mm, whitish to reddish, ± hairy, stalk-like base 0
Fruit 2–3 mm, glabrous
Ecology: Granite or limestone
Elevation: 1700–2500 m.
Bioregional distribution: s High Sierra Nevada.Much like E. kennedyi.

Native

var. shevockii J.T. Howell

THE NEEDLES BUCKWHEAT


Inflorescence dense to open, generally ± glabrous; involucre teeth rounded, obviously scarious-margined
Ecology: UNCOMMON. Granite
Elevation: 1700–2500 m.
Bioregional distribution: s High Sierra Nevada (The Needles, Baker Point, Little Kern River gorge, Kern and Tulare cos.).
See the CNPS Inventory for information about endangerment and rarity.
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bioregional map for ERIOGONUM%20breedlovei%20var.%20shevockii being generated
 
N.B. The distribution depicted here differs from that given in The Jepson Manual (1993)

Retrieve Jepson Interchange Index to Plant Names entry for Eriogonum breedlovei var. shevockii
Retrieve dichotomous key for Eriogonum
Overlay Consortium of California Herbaria specimen data by county on this map
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