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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  • 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.

OXYRIA

MOUNTAIN SORREL


Species in genus: 1 sp
Etymology: (Greek: sour, from acidic taste)

Native

O. digyna (L.) Hill

Perennial, glabrous, becoming red-tinged; caudex thick, scaly
Stem erect, < 5 dm
Leaves ± basal, alternate, petioled; stipules fused, loosely sheathing stem above nodes, breaking; blade << petiole, reniform, fleshy, sour-tasting
Inflorescence: panicle, erect, ± open
Flower nodding; perianth lobes 4, < 2 mm; stamens 6; styles 2
Fruit flat, conspicuously winged
Chromosomes: 2n=14
Ecology: Alpine rock crevices, talus
Elevation: 1800–4000 m.
Bioregional distribution: Klamath Ranges, High Cascade Range (Mount Lassen), Sierra Nevada, San Bernardino Mountains, San Jacinto Mountains, Warner Mountains, East of Sierra Nevada
Distribution outside California: circumboreal
Flowering time: Jul–Sep
Horticultural information: DRN, IRR: 1; DFCLT.

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