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Key to families | Table of families and genera
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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 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.Key to Alisma
± 9 species: generally northern temperate. (Greek: ancient name) North American species need study.
Unabridged references: [Bjorkqvist 1968 Opera Bot 19:1–138]
Leaf: 12–40 cm; blade 6–12 cm, 1–3 cm wide, generally lanceolate, base tapered. Inflorescence: generally >> leaves; pedicels generally ascending to erect. Flower: petals ± cut, pink; style ± erect, tip recurved. Fruit: lateral walls generally thin, translucent.
2n=26,28. Ponds, rice fields, slow streams; < 500 m. Northwestern California, n Sierra Nevada Foothills, Sacramento Valley; Oregon; Chile, Australia; native to Eurasia, northern Africa. Summer–fall [Online Interchange]
Previous taxon: Alisma gramineum
Next taxon: Alisma triviale
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Mar 11 2014
Citation for this treatment: [Author of taxon treatment] 2012. Alisma, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=12461, accessed on Mar 11 2014
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