Jepson eFlora: Taxon page
Vascular Plants of California
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Comarum palustre

Higher Taxonomy
Family: RosaceaeView DescriptionDichotomous Key
Common Name: ROSE FAMILY
Habit: Annual to tree, glandular or not. Leaf: simple to palmately or pinnately compound, generally alternate; stipules free to fused (0), persistent to deciduous. Inflorescence: cyme, raceme, panicle, cluster, or flowers 1; bractlets on pedicel ("pedicel bractlets") generally 0--3(many), subtended by bract or generally not. Flower: generally bisexual, radial; hypanthium free or fused to ovary, saucer- to funnel-shaped, subtending bractlets ("hypanthium bractlets") 0--5, alternate sepals; sepals generally 5; petals generally 5, free; stamens (0,1)5--many, anther pollen sacs generally 2; pistils (0)1--many, simple or compound, ovary superior to inferior, styles 1--5. Fruit: 1--many per flower, achene (fleshy-coated or not), follicle, drupe, or pome with generally papery core, occasionally drupe-like with 1--5 stones. Seed: generally 1--5 (per fruit, not per flower).
Genera In Family: 110 genera, +- 3000 species: worldwide, especially temperate; many cultivated for ornamental, fruit, especially Cotoneaster, Fragaria, Malus, Prunus, Pyracantha, Rosa, Rubus. Note: Number of teeth is per leaf or leaflet, not per side of leaf or leaflet, except in Drymocallis.
eFlora Treatment Author: Daniel Potter & Barbara Ertter, family description, key to genera, treatment of genera by Daniel Potter, except as noted
Scientific Editor: Daniel Potter, Thomas J. Rosatti.
Genus: ComarumView Description 

Species In Genus: 1 sp. Etymology: (Greek: fruit of Arbutus unedo)
eFlora Treatment Author: Barbara Ertter
Reference: Ertter 2007 J Bot Res Inst Texas 1:31--46
Comarum palustre L.
Habit: Perennial herb, nonglandular, openly matted. Stem: non-flowering portion creeping, often floating and/or rooting at nodes; flower-stem erect to ascending, 20--50 cm, +- glabrous to +- strigose. Leaf: alternate, odd-1-pinnate to subpalmate, 5--20 cm; leaflets 2--3 per side, toothed, terminal generally +- = lateral, 15--70 mm, oblanceolate-elliptic, distal 1/3 toothed +- 1/4 to midvein, +- glabrous to sparsely strigose. Inflorescence: cyme, +- open, generally < 10-flowered; pedicels straight. Flower: hypanthium +- shallow, 5--10 mm wide; bractlets 5; sepals +- triangular; petals << sepals, 2--6 mm, +- ovate to elliptic, dark red; stamens 20--25, filaments 1.5--2.5 mm, anthers 1--1.5 mm, pollen sac 1, horseshoe-shaped; pistils many, ovaries superior, styles 0.8--2 mm, slender, jointed laterally to fruit. Fruit: achene, 1--1.5 mm, glabrous, glossy, +- brown, sometimes remaining attached to spongy receptacle. Chromosomes: 2n=28,42--64.
Ecology: Bogs, marshes; Elevation: < 2400 m. Bioregional Distribution: NCo, CaRH, n SNH, ScV, Wrn; Distribution Outside California: circumboreal. Flowering Time: May--Aug
Synonyms: Potentilla palustris (L.) Scop.
Jepson eFlora Author: Barbara Ertter
Reference: Ertter 2007 J Bot Res Inst Texas 1:31--46
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Botanical illustration including Comarum palustre

botanical illustration including Comarum palustre


Citation for this treatment: Barbara Ertter 2012, Comarum palustre, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on September 19, 2019.

Citation for the whole project: Jepson Flora Project (eds.) 2019, Jepson eFlora,, accessed on September 19, 2019.

Comarum palustre
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© 2007 George W. Hartwell
Comarum palustre
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© 2006 Steve Matson
Comarum palustre
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© 2006 Steve Matson
Comarum palustre
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© 2016 Keir Morse
Comarum palustre
click for enlargement
© 2002 California Academy of Sciences
Comarum palustre
click for enlargement
© 2006 Steve Matson

More photos of Comarum palustre in CalPhotos

Geographic subdivisions for Comarum palustre:
NCo, CaRH, n SNH, ScV, Wrn
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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.
View all CCH records
All markers link to CCH specimen records. The original determination is shown in the popup window.
Blue markers indicate specimens that map to one of the expected Jepson geographic subdivisions (see left map). Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.

CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time.