Potamogeton robbinsii Oakes
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Authority
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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Family
Potamogetonaceae
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Scientific Name
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Description
Species Description - Stems to 1 m, sparingly branched below, repeatedly branched above when flowering; rhizome not tuberous; lvs all submersed, crowded on sterile stems (the internodes often only 1 cm), rather firm, distichous, linear, 3–10 cm × 3–8 mm, abruptly contracted and with rounded auricles at the juncture with the stipule, with prominent midvein and numerous (20–60) fine lateral veins, the margin pale and somewhat cartilaginous, usually minutely spinulose-serrulate at least toward the acute tip; stipular sheath open, adnate to the blade for 5–15 mm, the free part as long or longer, soon disintegrating into coarse fibers; peduncles numerous, almost paniculate, 2–5 cm, subtended by stipular sheaths with the blades much reduced or none and often accompanied by winter-buds; spikes slender, 7–15 mm, with 3–5 separated whorls of fls; achenes rarely produced, obovoid, 3.5–4.5 mm, with a narrow, sharp dorsal keel and 2 rounded lateral ones; 2n=52. Quiet water; Que. to B.C., s. to Del., Ala., Minn., and Oreg.
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Common Names
fern-pondweed