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.

Potamogeton natans

Least Concern  (IUCN 3.1)[1]
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Alismatales
Family: Potamogetonaceae
Genus: Potamogeton
Species:
P. natans
Binomial name
Potamogeton natans

Description
Floating leaves

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]

gollark: The most interesting quantum thingy™ I'm aware of is Grover's algorithm, which seems to just magically be able to speed up some search-ish/brute-force things using magic.
gollark: Wait, so if I find a big prime number and use the `factor` command on it, I can actually say that my computer is outperforming leading-edge quantum computers at that task?
gollark: One day quantum computers might even be able to do useful things faster than my phone!
gollark: Still, it's a thing. Definitely a thing.
gollark: We've reached a point where quantum computers can do *some stuff* faster than classical ones, in that while it would be theoretically possible to emulate... Sycamore, or whatever it was, the one Google or someone had for "quantum supremacy" or something... on a supercomputer, it would take several days to do what it did in two minutes.

References
  1. Gupta, A.K. (2013). "Potamogeton natans". IUCN Red List of Threatened Species. 2013. Retrieved 24 June 2018.CS1 maint: ref=harv (link)
  2. "BSBI List 2007". Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-01-25. Retrieved 2014-10-17.
  3. "Potamogeton natans". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 13 October 2015.
  4. Rose, Francis (2006). The Wild Flower Key. Frederick Warne & Co. pp. 490–491. ISBN 978-0-7232-5175-0.


This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.