Jepson eFlora: Taxon page
Key to families | Table of families and genera
Previous taxon Index to 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 |
Next taxon
Rumex crassus

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: RumexView DescriptionDichotomous Key

Common Name: DOCK
Habit: Annual to perennial herb; glabrous or papillate and hairy; rhizomed, stoloned, or generally from taproot with a short caudex; occasionally dioecious. Stem: prostrate, decumbent, or generally erect to ascending, often +- ridged, red-brown in fruit, nodes +- swollen. Leaf: generally basal and cauline, alternate, petioled except uppermost cauline; ocreae deciduous to persistent. Inflorescence: axillary or generally terminal, generally panicle-like. Flower: generally bisexual, bell-shaped, glabrous, green, +- pink, or red; perianth lobes 6, persistent, in fruit outer 3 +- inconspicuous, inner 3 enlarged, hardened, +- veiny, covering fruit, midrib of 1--3 often expanded into tubercle; stamens 6; stigmas 3, fringed. Fruit: achene, glabrous, +- black or dark brown to +- red.
Species In Genus: 190--200 species: +- worldwide, 63 in North America. Etymology: (Latin: sorrel) Note: Mature inner perianth lobes generally needed for identification. Species often hybridize.
eFlora Treatment Author: Scott Simono

Rumex crassus Rech. f.
Habit: Perennial herb, glabrous; taproot vertical. Stem: decumbent to ascending, 2--5(6) dm, generally with axillary shoots below 1° inflorescence. Leaf: blade 3--12 cm, 1--5 cm wide, lance-ovate to -elliptic or ovate-elliptic, thick, leathery, base tapered or truncate, margin entire, flat, tip acute. Inflorescence: axillary, terminal, generally dense, interrupted near base or not, branches generally simple; whorls 10--25-flowered; pedicels 4--9 mm, +- 2 × as long as inner perianth, thick, joints swollen. Flower: inner perianth lobes (3)4--5 mm, (2.5)3--4 mm wide, widely to narrow-ovate to -deltate, base rounded to +- truncate, margin entire to irregularly toothed, tip +- acute; tubercle 1, large, almost as wide as lobe, +- glabrous, warty. Fruit: 2--2.5 mm, 1.7--2.1 mm wide, brown to dark red-brown. Chromosomes: 2n=20.
Ecology: Coastal dunes, sandy shores, marshes; Elevation: < 100 m. Bioregional Distribution: NCo, CCo; Distribution Outside California: Oregon. Flowering Time: Feb--Jul
Synonyms: Rumex salicifolius Weinm. var. crassus (Rech.f.) J.T. Howell
eFlora Treatment Author: Scott Simono
Jepson Online Interchange

Previous taxon: Rumex conglomeratus
Next taxon: Rumex crispus

Name Search


Citation for this treatment: Scott Simono 2016. Rumex crassus, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on October 22, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on October 22, 2016.

Rumex crassus
click for enlargement
© 2014 Neal Kramer
Rumex crassus
click for enlargement
© 2014 Neal Kramer
Rumex crassus
click for enlargement
© 2007 Neal Kramer
Rumex crassus
click for enlargement
© 2014 Neal Kramer
Rumex crassus
click for enlargement
© 2011 Neal Kramer
Rumex crassus
click for enlargement
© 2009 Neal Kramer

More photos of Rumex crassus in CalPhotos

Geographic subdivisions for Rumex crassus:
NCo, CCo;
Markers link to CCH specimen records. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
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).

View elevation by latitude chart
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 eFlora flowering time.