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.



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.


Species in genus: 1 sp
Etymology: (Greek: winged cover, from involucre)
Reference: [Reveal 1989 Phytologia 66:228–235]


P. drymarioides Fisch. & C.A. Mey.

Annual, prostrate or sprawling, (mats < 12 dm diam), thinly hairy, monoecious
Leaves cauline, opposite, petioled; stipule 0; blade 3–20 mm, generally fan-shaped, entire to deeply notched and appearing 2-lobed
Inflorescence: flowers 1–2 per node, 1 or both generally staminate; only pistillate flowers involucred; involucre growing with fruit to 1–3 mm, net-veined, cream to pink or rose, wings 2, outer surface rounded, inner hollowed
Flower: perianth 0.9–1.2 mm, pale yellow to pink or rose, sparsely hairy, lobes 5–6; stamens 6
Fruit ± 1.5 mm, brownish
Chromosomes: n=14
Ecology: Common. Shady, often moist places
Elevation: < 1600 m.
Bioregional distribution: California
Distribution outside California: to s Oregon, s Nevada, sw Utah, w Arizona, nw Mexico
Flowering time: Mar–Jul

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