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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

ALISMA WATER-PLANTAIN
Perennial herb; roots not septate; flowers bisexual. Leaf: blade linear to ovate, tapered to base or petioled, base tapered to truncate, rounded, or ± lobed. Inflorescence: peduncle generally smooth; pedicels < 45 mm in fruit. Flower: receptacle ± flat; sepals generally 1–4 mm; petals entire to ± cut, white or pink; stamens generally 6; pistils many, free, in 1 whorl on margin of ± flat receptacle. Fruit: body generally 1.5–3 mm, erect, generally strongly compressed, lateral walls opaque to translucent, abaxially thin-ridged; beak < body, generally lateral.
± 9 species: generally northern temperate. (Greek: ancient name) North American species need study.
Unabridged references: [Bjorkqvist 1968 Opera Bot 19:1–138]

Key to Alisma

A. gramineum Lej. GRASS ALISMA
NATIVE
Leaf: 6–30 cm; blade 3–7 cm, 0.8–2 cm wide, linear to narrowly lanceolate, base tapered. Inflorescence: < to ± > leaves; pedicels generally recurved to spreading. Flower: petals white or pink; style ± coiled. Fruit: lateral walls generally thick, opaque.
2n=14. Ponds; 1200–1800 m. Modoc Plateau; to Canada, eastern United States; Eurasia. Summer–fall [Online Interchange] {CNPS list}
Unabridged synonyms: [Alisma geyeri Torr.]

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Oct 30 2014
Citation for this treatment: [Author of taxon treatment] 2013. Alisma, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=12458, accessed on Oct 30 2014

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Geographic subdivisions indicated for the distribution of Alisma gramineum 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.