Flora of North America species comparison

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Potamogeton perfoliatus

clasping-leaf pondweed, potamot perfolié
Rhizomes

present.
Cauline stems

terete, without spots, to 250 cm;

nodal glands absent.
Turions

absent.
Leaves

submersed, ± spirally arranged, sessile, lax;

stipules deteriorating into fibers and deciduous, inconspicuous (absent on proximal portion of stem), convolute, free from blade, light brown to green, not ligulate, 3.5–6.5 cm, not fibrous, not shredding at apex;

blade olive-green, broadly lanceolate, orbiculate, or ovate, not arcuate, 0.9–7.6(–9.7) cm × 7–40 mm, base rounded, without basal lobes, clasping, margins entire, often crispate, apex not hoodlike, not splitting when pressed, round, rarely acute;

veins 3–25.
Inflorescences

unbranched, emersed;

peduncles not dimorphic, terminal or axillary, erect to rarely recurved, cylindric, 1–7.3 cm;

spike not dimorphic, cylindric, 0.4–4.8 cm.
Fruits

sessile, greenish brown to olive-green, obovoid, turgid or rarely concave, not abaxially or laterally keeled, 1.6–3 × 1.3–2.2 mm;

beak erect, 0.4–0.6 mm;

sides without basal tubercles;

embryo with 1 full spiral.
2n

= 52.

Potamogeton perfoliatus
Phenology Flowering summer–fall.
Habitat Waters, often brackish, of lakes, streams, rivers, and bays
Elevation 0–100 m (0–300 ft)
Distribution
from FNA
AL; CT; DC; DE; FL; LA; MA; MD; ME; NC; NH; NJ; NY; OH; PA; RI; VA; VT; NB; NL; NS; ON; PE; QC; SPM; Africa; Greenland; Eurasia; Central America (Guatemala); Australia
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[BONAP county map]
Discussion

Four hybrids, Potamogeton perfoliatus × P. praelongus (= P. × cognatus Ascherson & Graebner), P. perfoliatus × P. pusillus (= P. × mysticus Morong), P. gramineus × P. perfoliatus (= P. × nitens Weber [P. × subnitens Hagström]), and P. alpinus × P. perfoliatus (= P. × prussicus Hagström), have been described.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 22.
Parent taxa Potamogetonaceae > Potamogeton
Sibling taxa
P. alpinus, P. amplifolius, P. bicupulatus, P. clystocarpus, P. confervoides, P. crispus, P. diversifolius, P. epihydrus, P. floridanus, P. foliosus, P. friesii, P. gramineus, P. groenlandicus, P. hillii, P. illinoensis, P. natans, P. nodosus, P. oakesianus, P. oblongus, P. obtusifolius, P. ogdenii, P. praelongus, P. pulcher, P. pusillus, P. richardsonii, P. robbinsii, P. spirillus, P. strictifolius, P. subsibiricus, P. tennesseensis, P. vaseyi, P. zosteriformis
Name authority Linnaeus: Sp. Pl. 1: 126. 1753 (as perfoliatum)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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