Potamogeton gramineus
| Potamogeton gramineus | |
|---|---|
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| Scientific classification | |
| Kingdom: | Plantae |
| (unranked): | Angiosperms |
| (unranked): | Monocots |
| Order: | Alismatales |
| Family: | Potamogetonaceae |
| Genus: | Potamogeton |
| Species: | P. gramineus |
| Binomial name | |
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Potamogeton gramineus L. |
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| Synonyms | |
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Potamogeton argutulus Hagstr. Potamogeton augustani Bellardi Potamogeton augustanus Balb. Potamogeton biformoides Papch. Potamogeton borealis Kihlm. Potamogeton crassipes Kit. ex Cham. & Schlecht. Potamogeton delicatulus Bertol. Potamogeton distachyus Bellardi Potamogeton falcatus Fryer Potamogeton filiformis Pursh ex Tuck. Potamogeton gracilis Wolfg.. Potamogeton graminifolius (Fr.) Benkö Potamogeton heterophyllus Schreb. Potamogeton heterophyllus Torr. Potamogeton hybridus Petagna Potamogeton lanceolatus Poir. Potamogeton lanciformis Roem. & Schult. Potamogeton latifolius Sloboda Potamogeton longipedunculatus Mérat Potamogeton oblongifolius Hook.f. Potamogeton palustris Teesd. Potamogeton paucifolius Opiz Potamogeton seemenii Asch. & Graebn. Potamogeton spathiformis Tuck. ex A.Gray Potamogeton varians Morong ex Fryer Potamogeton wolfgangii Kihlm. Spirillus heterophyllus (Schreb.) Nieuwl. |
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Potamogeton argutulus Hagstr. Potamogeton augustani Bellardi Potamogeton augustanus Balb. Potamogeton biformoides Papch. Potamogeton borealis Kihlm. Potamogeton crassipes Kit. ex Cham. & Schlecht.
Potamogeton delicatulus Bertol. Potamogeton distachyus Bellardi Potamogeton falcatus Fryer Potamogeton filiformis Pursh ex Tuck. Potamogeton gracilis Wolfg.. Potamogeton graminifolius (Fr.) Benkö
Potamogeton heterophyllus Schreb. Potamogeton heterophyllus Torr. Potamogeton hybridus Petagna Potamogeton lanceolatus Poir. Potamogeton lanciformis Roem. & Schult.
Potamogeton latifolius Sloboda Potamogeton longipedunculatus Mérat
Potamogeton oblongifolius Hook.f. Potamogeton palustris Teesd. Potamogeton paucifolius Opiz Potamogeton seemenii Asch. & Graebn.
Potamogeton spathiformis Tuck. ex A.Gray
Potamogeton varians Morong ex Fryer Potamogeton wolfgangii Kihlm. Spirillus heterophyllus (Schreb.) Nieuwl.
Potamogeton gramineus is a species of aquatic plant known by the common name various-leaved pondweed,variableleaf pondweed,grass-leaved pondweed or grassy pondweed, native to the northern hemisphere where it grows in shallow, clean water.
This is an aquatic perennial growing from a creeping rhizome that anchors in wet substrate. It produces thin, cylindrical, heavily branching stems usually less than a metre in length. The submerged leaves are sessile, relatively narrow, typically 40–90 mm long and 5–12 mm wide along the main stem but smaller on the side branches. They are translucent and pale green with a white midrib, and finely toothed. Floating leaves are more oval in shape, 20–70 mm long by 7–34 mm wide, and borne on long petioles. The inflorescence is a short spike of many flowers arising from the water on a stout peduncle.
This species readily hybridizes with many other species of Potamogeton. Hybrids have been recorded with P. perfoliatus (P. × nitens Weber), P. lucens (P. × angustifolius J.Presl.), P. natans (P. × sparganiifolius Laest. ex Fr.), P. coloratus (P. × billupsii Fryer), P. maackianus (P. × biwaensis Miki), P. illinoensis (P. × spathuliformis (J.W.Robbins) Morong), P. richardsonii (P. × hagstromii A.Benn.), P. alpinus (P. × nericius Hagstr.), P. nodosus (P. × lanceolatifolius (Tiselius) C.D.Preston), P. oakesianus (P. × mirabilis Z.Kaplan, Hellq. & Fehrer) and P. polygonifolius. In Britain, P. x nitens and P. x angustifolius are quite common. Recent molecular analysis has shown that Swedish collections of the putative hybrid P. gramineus x P. polygonifolius are in fact P. gramineus x P. nodosus.
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