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MENYANTHACEAE BUCKBEAN FAMILY

Robert F. Thorne, C. Barre Hellquist & William J. Stone

Perennial herb [annual], ± aquatic, herbage glabrous; rhizomes thick. Leaf: simple or of 3 leaflets, generally alternate; stipules generally 0; petiole bases sheathing. Inflorescence: various. Flower: bisexual [unisexual], radial; sepals 5, united or not; corolla rotate to funnel-shaped, lobes 5, fringed or coarse-hairy marginally or adaxially or not; stamens 5, epipetalous, alternate corolla lobes, anthers sagittate; nectaries generally 5, at ovary base; pistil 1, ovary generally ± superior, chamber 1, stigma 2-lobed. Fruit: capsule [± fleshy], valves 2–4. Seed: few to many, smooth, shiny.
5 genera, ± 70 species: worldwide. —Scientific Editor: Thomas J. Rosatti.
Unabridged references: [Kadereit, J. W. 2006 [2007]. Asterales: Introduction and Conspectus. Pp. 1–6, in Kadereit, J. W. & Jeffrey, C. (eds.), The Families and Genera of Vascular Plants. Volume VIII. Flowering Plants. Eudicots. Asterales. Springer, Berlin; Tippery, N. P. [et al. 2006], Les, D. H., Padgett, D., & Surrey, J. 2006. Clades and grades: An evaluation of generic circumscriptions in Menyanthaceae Dumort. (Asterales). Pp. 262–263, in Botany 2006 - Looking to the Future - Conserving the Past. (Abstracts: Botanical Society of America, etc.)]

Key to Menyanthaceae

NYMPHOIDES FLOATING-HEART
Leaf: simple, submersed or floating, deeply cordate, generally alternate, those on flowering stems generally opposite; petioles > blades. Inflorescence: ± umbel, in axils of petioles near top of long, petiole-like flower stem, often with clusters of tuberous roots. Flower: corolla rotate, white or yellow, lobes with a glandular appendage near base; filaments < to > style; stigma persistent, 2-lobed. Fruit: irregularly dehiscent.
± 50 species: North America, South America, Eurasia, Africa, Australia. (Greek: Nymphaea-like, from resemblance of leaves to those of water lily) Sometimes in Gentianaceae, but plants differ in their ± aquatic habitats, generally alternate, petioled leaves, and several other ways.

N. peltata (S.G. Gmel.) Kuntze WATER FRINGE
NATURALIZED
Heterostylous. Stem: < 160 cm, creeping; flowering stems floating. Leaf: 3–10 cm wide; margin wavy or entire. Inflorescence: flowers 2–5. Flower: pedicel 3–10 cm, ± thick; calyx lobes lance-oblong; corolla 30–40 mm diam, yellow, lobe margins wide, thin, wavy, fringed-ciliate; styles < filaments on some plants, > filaments on others. Seed: ovate, flat, coarsely ciliate.
2n=54. Still water, slow-moving rivers; ± 1100 m. n High Sierra Nevada (Trout Lake, El Dorado Co.), Central Coast (reported); Washington, northeastern United States, Arkansas, Arizona; native to Eurasia, Mediterranean. Cult in aquatic gardens; listed as invasive in many states. Jun–Sep [Online Interchange]

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Dec 20 2014
Citation for this treatment: [Author of taxon treatment] 2013. Nymphoides, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=34809, accessed on Dec 20 2014

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Geographic subdivisions indicated for the distribution of Nymphoides peltata 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.