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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 Editors: Thomas J. Rosatti, Bruce G. Baldwin.
Key to Polygonaceae
Annual, perennial herb to shrub. Stem: prostrate to erect, 8–16-ribbed or 4–5-angled with ribs 0 or obscure; glabrous or papillate-scabrous. Leaf: cauline, alternate, petioled or not; ocrea generally jointed to leaf, generally cylindric proximally, generally translucent distally, white or silvery, 2-lobed, glabrous, disintegrating to fibers or completely; blade linear, lanceolate, elliptic, ovate, or subround, entire. Inflorescence: axillary, terminal, generally spike-like; peduncle 0; pedicels present or 0, included in to exserted from bractlets; flowers 1–7(10). Flower: bisexual, base not stalk-like; perianth not enlarging, bell- to urn-shaped, glabrous, white or green-white to pink; perianth parts 5, fused 3–60%, petal- or sepal-like, similar [or not], outer ± keeled or not, < to > inner, midveins generally a different shade or color than rest of perianth; stamens 3–8 (some staminodes or not), filaments or at least innermost free, wider at base, fused to perianth tube or not, anthers elliptic to oblong, white-yellow or generally pink to purple (orange-pink); styles (2)3, generally spreading, free or fused basally, stigmas 2–3, head-like. Fruit: included or exserted, wings 0, angles (2)3, 1 face much narrower than other (1)2 or not; tip beak-like, yellow-green, brown, or black. Seed: embryo curved.Key to Polygonum
± 65 species: ± worldwide; sect. Duravia restricted to western North America. (Greek: many, knee joint or seed, of uncertain meaning) [Costea 2005 Brittonia 57:1–27] Many species of sect. Polygonum with 2 kinds of fruit, differing in germination and morphology (summer fruit brown, ovate, tubercled to smooth; late-season fruit olive-green, lanceolate, smooth, 2–5 × > summer), but of little taxonomic importance. Mature, early-season plants with leaves, flowers, fruits needed for identification. Flowers "closed" or "1/2-open" should be determined on herbarium specimens. Other taxa in TJM (1993) moved to Aconogonon, Bistorta, Fallopia, Persicaria.
Unabridged etymology: (Greek: poly, many, gony, knee joint, or gone, seed, of uncertain meaning)
Annual. Stem: erect, 5–80 cm, glabrous or sparsely papillate-scabrous, green, ± angled, branches 0 or not. Leaf: basal leaves early-deciduous, distal abruptly reduced to bracts; ocreae 6–12 mm, glabrous or minutely papillate-scabrous, proximally cylindric, distally deeply cut; petiole 0.1–2 mm; blade 15–55 mm, 2–8(12) mm wide, lance-linear, narrowly oblong, or oblanceolate, margin rolled under, smooth or papillate-fine-dentate; tip acute to mucronate. Inflorescence: axillary, terminal, spike-like; pedicels generally exserted, reflexed, 2–6 mm; flowers 2–4. Flower: closed; perianth 3–4.5 mm, green to ± tan, margin white or pink, tube 20–28% of length, lobes overlapped, oblong, ± keeled, tip rounded, hood-shaped, midvein generally branched; stamens 8. Fruit: included, 3–4(4.5) mm, elliptic or oblong to ovate, black, shiny or dull, smooth to minute-striate-tubercled.
2n=40. Dry, rocky outcrops, sandy ground, disturbed places; < 3500 m. California (especially mtns); to Canada, eastern North America. Jun–Oct [Online Interchange]
Unabridged synonyms: [Polygonum douglasii Greene subsp. douglasii]
Previous taxon: Polygonum californicum
Next taxon: Polygonum fowleri subsp. fowleri
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on May 22 2015
Citation for this treatment: [Author of taxon treatment] 2013. Polygonum, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=39200, accessed on May 22 2015
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|Geographic subdivisions indicated for the distribution of Polygonum douglasii|| 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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