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Key to families | Table of families and genera
Indexes to all accepted names and synonyms:
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Annual to shrub [tree]. Stem: nodes swollen or not. Leaf: simple, basal or cauline, generally alternate; ocreae present or 0, generally scarious, persistent or not. Inflorescence: flower clusters in axillary to terminal cyme-, panicle-, raceme-, spike-, umbel- or head-like arrangements, entire inflorescence or main inflorescence branches generally subtended by bracts ("inflorescence bracts"); peduncles present or 0; flower clusters in Eriogoneae-Eriogonoideae subtended by involucre of >= 1 free or ± fused, sometimes awn-tipped bracts ("involucre bracts") or, in Polygonoideae and rarely in Eriogonoideae, not (if bracts completely fused, involucre "tubular"); pedicels in Eriogoneae each often subtended by 2 free, transparent, linear bractlets or in Polygonoideae all subtended by 2+ fused, membranous, wide bractlets. Flower: generally bisexual, small, 1–200 per node; perianth parts 2–6, generally in 2 whorls, free or basally fused, generally petal-like, often ± concave adaxially, often darker at midvein, often turning ± red or ± brown in age; stamens 3 or 6–9 in 2 whorls; ovary superior, 1-chambered, ovule 1, styles 1–3. Fruit: achenes, included in or exserted from perianth, generally 3-angled, ovoid or elliptic, generally glabrous.
48 genera, ± 1200 species: worldwide, especially northern temperate; some cultivated for food (Coccoloba, sea-grape; Fagopyrum, Rheum, Rumex) or ornamental (Antigonon, lovechain; Coccoloba; Muehlenbeckia; Persicaria; Polygonum), a few timbered (Coccoloba; Triplaris). Several (Emex; Fallopia; Persicaria; Polygonum; Rumex) are weeds. [Freeman & Reveal 2005 FNANM 5:216–601] Treatment of genera in Eriogonoideae based on monographic work of James L. Reveal. Involucre number throughout is number (1–many) per ultimate grouping, at tips of ultimate branches; flower number is per flower cluster or involucre, unless otherwise stated. Fagopyrum esculentum Moench not naturalized, considered an historical waif (or garden weed ± presently), therefore not treated. —Scientific Editor: Thomas J. Rosatti.
Key to Polygonaceae
4 species. (Greek: sour, from acidic taste) [Chrtek & Sourková 1992 Preslia 64:207–210]
Perennial herb, glabrous, often ± red; caudex thick, scaly; rhizome rare; roots fibrous. Stem: erect, (0.3)0.5–5 dm. Leaf: ± basal, alternate, petioled, ± fleshy, stipules fused, ± translucent, deciduous or not; blade 0.5–6.5 cm, << petiole, reniform. Inflorescence: panicle, erect, 2–20 cm, ± open; peduncle 1–15 cm. Flower: 2–6 per node, nodding, bisexual, perianth parts 4, outer 2 spreading, 1.2–2.5 mm; stamens 6; styles 2, stigmas red. Fruit: 3–4.5 mm, 2.5–5 mm wide, elliptic, flat, 2-winged, ± red or ± pink, veiny.
2n=14. Alpine rock crevices, talus; 1800–4000 m. Klamath Ranges, High Cascade Range, Sierra Nevada, San Bernardino Mountains, San Jacinto Mountains, Warner Mountains, East of Sierra Nevada; circumboreal. Jul–Sep [Online Interchange]
Previous taxon: Oxyria
Next taxon: Oxytheca
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Sep 1 2014
Citation for this treatment: [Author of taxon treatment] 2013. Oxyria, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=35722, accessed on Sep 1 2014
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|Geographic subdivisions indicated for the distribution of Oxyria digyna|| Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).
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