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Key to families | Table of families and genera

Specimen numbers are hyperlinked to records in the Consortium of California Herbaria data view where possible. Taxa are hyperlinked to entries in the Jepson Interchange via the "[Online Interchange]" link.

 

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

1. Pistils, fruits ± fused at base; petals cut; flowers bisexual; stamens 6 ..... DAMASONIUM

1' Pistils, fruits free, in 1 whorl on margin of ± flat receptacle or spiralled on convex receptacle; petals ± cut to generally entire; flowers bisexual or unisexual; stamens 0, generally 6, or 7–30

2. Pistils, fruits in 1 whorl on margin of ± flat receptacle; stamens generally 6; flowers bisexual ..... ALISMA

2' Pistils, fruits spiralled on convex receptacle; stamens 0 or 7–30; flowers bisexual or unisexual

3. Flowers bisexual; fruit cluster bur-like, beaks terminal, 0.6–1.3 mm ..... ECHINODORUS

3' Fls, or at least proximal, unisexual; fruit cluster not bur-like, beaks terminal, 0.1–0.4 mm, or lateral, 0.1–2 mm ..... SAGITTARIA

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Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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