Jepson eFlora: Taxon page
Vascular Plants of California
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Damasonium californicum

Higher Taxonomy
Family: AlismataceaeView DescriptionDichotomous Key
Habit: Annual, perennial herb from caudices, corms, stolons, rhizomes, or tubers, aquatic (+- emergent or on mud); roots fibrous, septate or not; monoecious, dioecious, or flowers bisexual. Stem: caudex short. Leaf: basal, simple, palmately veined, floating or not; submersed generally linear to ovate; emergent linear to sagittate. Inflorescence: generally scapose, umbel-, raceme-, or panicle-like; flowers, branches whorled. Flower: radial; sepals 3, generally green, generally persistent; petals 3, generally > sepals, white or pink; stamens 6--many; pistils 6--many, free or +- fused at base. Fruit: achene, generally compressed, beaked.
Genera In Family: +- 12 genera, 75--100 species: especially tropics, subtropics.
eFlora Treatment Author: Charles E. Turner, Robert R. Haynes & C. Barre Hellquist
Scientific Editor: Thomas J. Rosatti.
Genus: DamasoniumView Description 

Habit: Perennial herb; roots not septate; flowers bisexual. Leaf: blade linear to ovate, tapered to base or petioled, base tapered to rounded. Inflorescence: peduncle generally smooth. Flower: receptacle +- flat; sepals generally 3.5--6 mm; petals cut, white to pink; stamens 6; pistils 6--15, in 1 whorl, +- fused at base, ovules 1[2]. Fruit: generally +- spreading, laterally compressed, sides generally opaque, abaxially +- rounded, ribbed; beak >= body, generally terminal.
Species In Genus: +- 5 species: North America, Europe, Australia. Etymology: (Greek: ancient name)
Unabridged Reference: Vuille 1987 Pl Syst Evol 157:63--71
Damasonium californicum Torr. ex Benth.
Leaf: 5--35 cm; blade 3--9 cm, 0.5--3 cm wide, generally < petiole, linear to narrowly ovate. Inflorescence: generally > leaves; pedicels 15--65 mm in fruit, spreading to ascending. Flower: petals 6--10 mm, basal spot yellow; anthers +- red. Fruit: body 3--5.5 mm; beak 3--6 mm.
Ecology: Ponds, vernal pools, streams; Elevation: < 1700 m. Bioregional Distribution: NCoRI, n SNF, GV, nw SnFrB, MP; Distribution Outside California: to Oregon, Idaho, Nevada. Flowering Time: Late summer
Synonyms: Machaerocarpus californicus (Torr. ex Benth.) Small
Jepson eFlora Author: Charles E. Turner, Robert R. Haynes & C. Barre Hellquist
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)

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Citation for this treatment: Charles E. Turner, Robert R. Haynes & C. Barre Hellquist 2012, Damasonium californicum, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on June 28, 2022.

Citation for the whole project: Jepson Flora Project (eds.) 2022, Jepson eFlora,, accessed on June 28, 2022.

Damasonium californicum
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© 2007 Carol W. Witham
Damasonium californicum
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© 2018 Steve Matson
Damasonium californicum
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© 2009 George W. Hartwell
Damasonium californicum
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© 2003 Steve Matson
Damasonium californicum
click for enlargement
© 2018 Steve Matson
Damasonium californicum
click for enlargement
© 2008 Steve Matson

More photos of Damasonium californicum in CalPhotos

Geographic subdivisions for Damasonium californicum:
NCoRI, n SNF, GV, nw SnFrB, MP
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2. County and Jepson Region polygons can be turned off and on using the check boxes.
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).


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 (fruiting time in some monocot genera).