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Charles E. Turner, Robert R. Haynes & C. Barre Hellquist

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.
± 12 genera, 75–100 species: especially tropics, subtropics. [Haynes & Hellquist 2000 FNANM 22:7–25] —Scientific Editor: Thomas J. Rosatti.
Unabridged references: [Rogers 1983 J Arnold Arbor 64:383–420]

Key to Alismataceae

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.
± 5 species: North America, Europe, Australia. (Greek: ancient name)
Unabridged references: [Vuille 1987 Plant Syst Evol 157:63–71]

D. californicum 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.
Ponds, vernal pools, streams; < 1700 m. Inner North Coast Ranges, n Sierra Nevada Foothills, Great Central Valley, nw San Francisco Bay Area, Modoc Plateau; to Oregon, Idaho, Nevada. [Damasonium californicum Torr. ex Benth.; Machaerocarpus californicus (Torr. ex Benth.) Small] Late summer [Online Interchange]
Unabridged note: Expanded author citation: Damasonium californicum Torr. ex Benth.

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora,, accessed on Nov 28 2015
Citation for this treatment: [Author of taxon treatment] 2013. Damasonium, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on Nov 28 2015

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click for enlargement Damasonium californicum
See CalPhotos for additional images
2007 Carol W. Witham

Geographic subdivisions indicated for the distribution of Damasonium californicum 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.
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.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.