Jepson Herbarium
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Indexes to all accepted names and synonyms: | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |

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.
48 genera, ± 1200 species: worldwide, especially n 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

Annual to shrub, matted or not.
Stem: prostrate to erect, occasionally 0, glabrous or hairy, occasionally glandular.
Leaf: basal, sheathing (on stem above basal, beneath other, ± non-sheathing cauline), or cauline, alternate, opposite, or whorled; blades linear to ± round, generally longer than wide, margins flat, wavy, or rolled under; ocreae 0.
Inflorescence: variable, glabrous or hairy, occasionally glandular; peduncles 0 or erect to reflexed (pointed down); involucres 1 or in clusters, tubular, glabrous or hairy, teeth generally 4–10, awns 0.
Flower: (2)6–100(200), with a stalk-like base (" flower stipe" or " stipe") or not; perianth generally white to red or yellow, glabrous or hairy, occasionally glandular, lobes 6, generally entire; stamens 9.
Fruit: generally brown or black, generally obconic, glabrous or hairy; embryo curved or straight.
± 250 species: temperate North America. (Greek: woolly knees, for hairy nodes of 1st sp. named) One of largest genera in CA; stem in descriptions refers to the main stem(s), not branches of inflorescence. A per allied to Eriogonum austrinum (S. Stokes) Reveal and Eriogonum moranii Reveal of e-c Baja CA, with spreading (rather than reflexed or erect) involucres on peduncles < 2 mm, occurring in DMtns (Bristol, Granite mtns), has been known for nearly 25 yrs yet remains undescribed. Eriogonum puberulum moved to Johanneshowellia.

Annual 1–4 dm.
Stem: 0.5–1 dm, glabrous.
Leaf: basal; blades 0.3–1.5 cm, generally ± round, generally tomentose.
Inflorescence: 5–35 cm, glabrous; peduncles 0; involucres generally appressed, 1–1.5 mm, 0.6–0.8 mm wide.
Flower: 1–1.5 mm; perianth white to rose or ± yellow, lobes generally oblong-obovate.
Fruit: 1–1.5 mm, glabrous.
Uncommon. Sand or gravel; 200–1200 m. San Francisco Bay Area, South Coast Ranges, Western Transverse Ranges.

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Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].

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Bioregions in which taxon occurs	Red area (if present) is the part of the bioregion lying between the upper and lower elevation limits of the taxon; 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 have georeferencing or identification issues.
Chart based on elevation range in Manual and elevations and coordinates of CCH records. Data provided by the participants of the Consortium of California Herbaria. Note: About half of the CCH records include both elevation and coordinates.	Map made in collaboration with Scott Loarie. Data provided by the participants of the Consortium of California Herbaria. View all CCH records   CCH collections by month Duplicates counted once; synonyms included. Species do not include records of infraspecific taxa. Blue line denotes Manual flowering time.