Contains 10 accepted taxa overall.
Characteristics
Classification
Citation
POTAMOGETON Linnaeus, Sp. Pl. 126. 1753.
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TYPE: Potamogeton natans Linnaeus Lectotypified by Taylor, in Britton, N. Amer. Fl. 17(1): 14, 30. 1909.
Species
| Scientific Name | Common Name | Herbarium Specimens | Status | Photos |
|---|---|---|---|---|
| Potamogeton crispus | CURLY PONDWEED | Not Native OBL (NWPL) | ||
| Potamogeton diversifolius | WATERTHREAD PONDWEED | Native OBL (NWPL) | ||
| Potamogeton epihydrus | RIBBONLEAF PONDWEED | Native OBL (NWPL) | ||
| Potamogeton floridanus | FLORIDA PONDWEED | Native Endemic Endangered-State OBL (NWPL) | ||
| Potamogeton foliosus | LEAFY PONDWEED | Native OBL (NWPL) | ||
| Potamogeton illinoensis | ILLINOIS PONDWEED | Native OBL (NWPL) | ||
| Potamogeton nodosus | LONGLEAF PONDWEED | Native OBL (NWPL) | ||
| Potamogeton perfoliatus | CLASPINGLEAF PONDWEED | Native OBL (NWPL) | ||
| Potamogeton pulcher | SPOTTED PONDWEED | Native OBL (NWPL) | ||
| Potamogeton pusillus | SMALL PONDWEED | Native OBL (NWPL) |
[Family identification key]
1. Stipular sheaths of submersed leaves adnate to base of leaf blade, tip projecting as ligule
1. Stipular sheaths of submersed leaves free from base of leaf blade or with only 1/–5 sheath adnate, ligule not obvious
2
2. Submersed leaf blade filiform, linear, or ribbon-like, 0.1-10 mm wide
3
2. Submersed leaf blades broadly linear-oblong, lanceolate, elliptic, to nearly orbiculate, 3-58 mm wide (occasional stranded plants without submersed leaves)
6
3. Rhizomes present; floating leaves present, at least in some plants in population
4
3. Rhizomes absent; floating leaves absent
5
4. Lacunae prominent in submersed leaves
4. Lacunae absent in submersed leaves
5. Fruits with abaxial keel or ridge
5. Fruits with abaxial surface rounded
6
6. Leaf blade with 0-2 rows of lacunae along midrib, apex acute, rarely apiculate, rarely with bristle; stipules connate; peduncles filiform to cylindric, 1-3 per plant; inflorescences interrupted; mature fruits obovoid, sides concave, beak toward adaxial edge, rarely median
6. leaf blade with 1-5 rows of lacunae along midrib, apex acute to obtuse; stipules convolute; peduncles cylindric, more than 3 per plant; inflorescences continuous; mature fruits widest at middle or ovoid, sides rounded, beak median, not toward adaxial edge
7. Stem flattened; leaf blade margins conspicuously serrate; fruit beak 2–3 mm; turions formed, hard
7. Stem terete; leaf blade margins entire; fruit beak 1 mm or less; turions rarely formed
8
8. Submersed leaves clasping stem; floating leaves absent
8. Submersed leaves petiolate or sessile (not clasping); floating leaves present
9
9. Stem conspicuously rusty- or black-spotted; floating leaf blade rounded to cordate at base; submersed leaf blades crispate, mostly arcuate
9. Stems without spots; floating leaf blade cuneate, tapering to petiole, rounded; submersed leaf blades flat or crispate, mostly not arcuate or occasionally arcuate
10
10. Submersed leaves sessile or petioles to 4 cm long; larger submersed leaves acuminate at apex; fruits grayish green to olive-green
10. Submersed leaves with petioles 0.5-13 cm long; larger submersed leaves acute at apex but without sharp awl-like tip; fruits red to reddish brown
Genus Synonyms
| Synonym | Full Citation | Basionym | Type |
|---|---|---|---|
| Spirillus | Spirillus J. Gay, Compt. Rend. Hebd. Seances Acad. Sci. 38: 703. 1854. | TYPE: Non designatus. |