Hippuris lanceolata
hippuride à feuilles lancéolées, lance-leaf mare's-tail
4–7 mm diam.
100–500 mm.
on mid portions of emergent shoots in whorls of (5 or)6(or 7), linear to narrowly oblong or lanceolate, 5–20 × 0.5–1.5 mm, midvein inconspicuous, lateral veins present, sometimes obscure, apex subacute, tip not curled in dried plants.
bisexual;
filaments equal to or shorter than anthers.
1.8–2 × 0.6–1.2 mm.
= 32 (Russian Far East).
Hippuris lanceolata
N. N. Tzvelev (1980) speculated that Hippuris lanceolata arose from hybridization between H. tetraphylla and H. vulgaris or their precursors. Although H. lanceolata is intermediate in some features, and is often misplaced with either H. tetraphylla or H. vulgaris, it is fertile and there is no indication of pollen abortion or failure of seed set. No transitional plants have been seen; hybrid origin appears unlikely. The range of H. lanceolata extends well north of that of either putative parent, especially that of H. vulgaris. Hippuris lanceolata is the sole species of Hippuris in some areas of the Arctic.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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