Biology:Potamogeton natans
| Potamogeton natans | |
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Scientific classification 
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| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Monocots |
| Order: | Alismatales |
| Family: | Potamogetonaceae |
| Genus: | Potamogeton |
| Species: | P. natans
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| Binomial name | |
| Potamogeton natans | |
Potamogeton natans, commonly known as broad-leaved pondweed,[2] floating pondweed,[3] or floating-leaf pondweed, is an aquatic species in the genus Potamogeton native to quiet or slow-flowing freshwater habitats throughout the Holarctic Kingdom.
Description
It produces both floating and submersed leaves on the same plant. The floating leaves are ovate to oblong-ovate and almost always cordate at the base. They are dark green, leathery, opaque, with translucent longitudinal veins. They are 5 to 10 cm long, pointed at the tips, and rounded at the base.
The stipules are 4 to 17 cm long.
The submerged grass-like structures are called phyllodes, are actually modified leaf stalks.
The stems are cylindrical, without many branches, and grow from 1 to 2 metres.
The main difference between this species and other pondweeds is a discoloured flexible joint just below the top of the long leaf stalk.
The flower spikes are dense, and cylindrical. They are 5 to 10 cm long, pointed at the tip and rounded at the base. It flowers from May to September.
The fruits are 4 to 5 mm long and obovate.[4]
References
- ↑ Gupta, A.K. (2013). "Potamogeton natans". IUCN Red List of Threatened Species 2013: e.T164479A19495876. doi:10.2305/IUCN.UK.2013-1.RLTS.T164479A19495876.en. https://www.iucnredlist.org/species/164479/19495876. Retrieved 11 November 2021.
- ↑ (xls) BSBI List 2007, Botanical Society of Britain and Ireland, https://bsbi.org/download/3542/, retrieved 2014-10-17
- ↑ "Potamogeton natans". Natural Resources Conservation Service PLANTS Database. USDA. https://plants.usda.gov/core/profile?symbol=PONA4.
- ↑ Rose, Francis (2006). The Wild Flower Key. Frederick Warne & Co. pp. 490–491. ISBN 978-0-7232-5175-0.
External links
- Potamogeton natans in Flora of North America
- USDA PLANTS Profile
Wikidata ☰ Q370566 entry
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