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ALISMATACEAE WATER-PLANTAIN FAMILY

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

DAMASONIUM
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.
NATIVE
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. 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, http://ucjeps.berkeley.edu/IJM.html, accessed on Sep 15 2014
Citation for this treatment: [Author of taxon treatment] 2013. Damasonium, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=22313, accessed on Sep 15 2014

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click for enlargement Damasonium californicum
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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.
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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.
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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.