Peltandra

Rafinesque
Journal de Physique, de Chimie, d'Histoire Naturelle et des Arts 89:103. 1819.
Common names: Arrow arum
Etymology: Greek pelte, small shield, and andros, male, referring to the shield-shaped tops of the staminate flowers
Treatment appears in FNA Volume 22. Treatment on page 135. Mentioned on page 136.

Herbs, wetland. Rhizomes vertical. Leaves appearing before flowers, several, clustered apically, erect; petiole equal to or longer than blade; blade green or glaucous light green, simple, not peltate, lanceolate to widely ovate, base hastate to sagittate, rarely cordate, apex acuminate to rounded or mucronate; lateral veins parallel. Inflorescences: peduncle recurving in fruit, half ½ as long as to slightly longer than petiole, apex not swollen; spathe tube green, enclosing base of spadix; spathe blade green to white, opening slightly to fully at anthesis; spadix cylindric. Flowers unisexual, staminate and pistillate on same plant,, pistillate flowers covering basal portion of spadix,, staminate flowers apical, consisting of 4–5 connate stamens forming flat-topped synandrium; sterile flowers proximal to and usually distal to staminate flowers; perianth absent. Fruits not embedded in spadix, red or green to dark purple-green. Seeds 1–2(–4), mucilage present. x = 14.

Distribution

Eastern North America.

Discussion

Only one species of Peltandra, P. virginica, (with two subspecies), was recognized by W. H. Blackwell and K. P. Blackwell (1974), a treatment followed by some botanists. They synonymized P. luteospadix with P. sagittifolia, based primarily on their contention that no Peltandra species have red fruits, and called that taxon P. virginica subsp. luteospadix (Fernald) Blackwell & Blackwell. All of the specimens cited in their treatment of the genus are P. virginica.

The two species of Peltandra can be distinguished not only on reproductive charactersistics, but also on features of leaf venation. Fossil leaves congeneric with modern Peltandra are known from very late Paleocene through early Eocene deposits of North America. Peltandra is one of two genera of Araceae endemic to the flora area (the other is Orontium).

Species 2 (2 in the flora).

Key

1 Lateral leaf veins of ± same thickness; spadix ±about 1/2 as long as spathe; spathe blade white; fruits red Peltandra sagittifolia
1 Lateral leaf veins of 2 different thicknesses; spadix more than 1/2 to almost as long as spathe; spathe blade green to green with white or yellow-green along margins; fruits pea green to mottled green or dark purple-green Peltandra virginica
... more about "Peltandra"
Sue A. Thompson +
Rafinesque +
Arrow arum +
Eastern North America. +
Greek pelte, small shield, and andros, male, referring to the shield-shaped tops of the staminate flowers +
Journal de Physique, de Chimie, d'Histoire Naturelle et des Arts +
blackwell1974a +  and thompson1995a +
Peltandra +