Sp. Pl.1: 343. 1753; Gen. Pl. ed. 5; 160, 1754
Widely distributed, nearly worldwide.
Much controversy surrounds the treatment of Alisma in North America. At present three distinct native species in North America are generally recognized (P. Rubtzoff 1964) as well as the probable occurrence of two introduced species, one in California and the other in Alaska.
Species 9 (5 in the flora).
|1||Style longer than or (equal to) ovary; anthers ellipsoid.||> 2|
|1||Style shorter than or (equal to) ovary; anthers ovoid to rounded.||> 3|
|2||Petals with obtuse apex, purplish white to purplish pink; style ± straight; leaf blade ovate to broadly lanceolate; Alaska.||A. plantago-aquatica|
|2||Petals with acute apex, purplish pink; style curved proximally; leaf blade narrowly elliptic to lanceolate; California.||A. lanceolatum|
|3||Achenes with 2 abaxial grooves, 1 abaxial ridge; leaves submersed, ribbonlike, or if emersed, blades linear-lanceolate to narrowly elliptic.||A. gramineum|
|3||Achenes with1 abaxial groove; leaves emersed, rarely submersed or floating, blades ovate to elliptic.||> 4|
|4||Fruiting heads 2–4 mm diam.; achenes 1.5–2.2 mm; petals 1–3 mm.||A. subcordatum|
|4||Fruiting heads 4.1–7 mm diam.; achenes 2.1–3 mm; petals 3.5–6 mm.||A. triviale|
|Author||Robert R. Haynes + and C. Barre Hellquist +|
|Common name||Water-plantain +|
|Etymology||ancient Greek name, adopted by Linnaeus from Dioscorides +|
|Illustrator||John Myers +|
|Reference||bj1968a +, hendricks1957a +, rubtzoff1964a + and voss1958a +|
|Taxon name||Alisma +|
|Taxon parent||Alismataceae +|
|Taxon rank||genus +|
|Volume||Volume 22 +|