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Oxyria digyna

Higher Taxonomy
Family: PolygonaceaeView DescriptionDichotomous Key

Habit: 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 [1]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.
Genera In Family: 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. Note: 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.
eFlora Treatment Author: Mihai Costea, except as noted
Genus: OxyriaView Description 


Species In Genus: 4 species. Etymology: (Greek: sour, from acidic taste)
eFlora Treatment Author: James L. Reveal & Thomas J. Rosatti

Oxyria digyna (L.) Hill
Habit: 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. Chromosomes: 2n=14.
Ecology: Alpine rock crevices, talus; Elevation: 1800--4000 m. Bioregional Distribution: KR, CaRH, SN, SnBr, SnJt, Wrn, SNE; Distribution Outside California: circumboreal. Flowering Time: Jul--Sep
eFlora Treatment Author: James L. Reveal & Thomas J. Rosatti
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botanical illustration including Oxyria digyna


Citation for this treatment: James L. Reveal & Thomas J. Rosatti 2016. Oxyria digyna, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on May 03, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on May 03, 2016.

Oxyria digyna
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© 2015 Neal Kramer
Oxyria digyna
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© 2010 Keir Morse
Oxyria digyna
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© 2010 California Academy of Sciences
Oxyria digyna
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© 2015 Neal Kramer
Oxyria digyna
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© 2015 Barry Breckling
Oxyria digyna
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© 2003 Steve Matson

More photos of Oxyria digyna in CalPhotos

Geographic subdivisions for Oxyria digyna:
KR, CaRH, SN, SnBr, SnJt, Wrn, SNE;
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.
map of distribution 1
(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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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.