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Peltandra Rafinesque. Arrow-arum.

Key to Peltandra

A genus of 2 species, endemic to e. North America.

ID notes:Peltandra is often confused in vegetative condition with Pontederia and Sagittaria, superficially similar emergent aquatics with hastate or sagittate leaves. Peltandra leaves have pinnate venation, a prominent midvein, a prominent vein running parallel to the leaf margin, and the hastate lobes with rounded to acute apices. Pontederia leaves have parallel venation, lack a prominent midvein and a prominent vein parallel to the leaf margin, and have hastate lobes with broadly rounded apices. The leaves of sagittate species of Sagittaria have parallel venation, a prominent midrib, a vein at 90 degrees to the midrib at the junction of the main blade and each of the hastate lobes that forks, with at least one fork directed apically and at least one fork directed into the basal lobe, lack a prominent vein parallel to the margin, and have hastate-sagittate lobes with acuminate apices.

Ref: Blackwell & Blackwell (1974); Fernald (1948); Mayo, Bogner, & Boyce In Kubitzki (1998b); Spaulding et al. (2019); Thompson (2000b) In Flora of North America Editorial Committee (2000). Show full citations.

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