Nuphar" sect. "Astylus is a section within the genus "Nuphar" native to North America.
Description.
Vegetative characteristics.
Its species are herbaceous plants.
Generative characteristics.
The flowers have 6–9 sepals. The androecium consists of laminar stamens with long anthers and short filaments. The furrowed, barrel-shaped, ovoid fruit does not have a prominent neck.
Taxonomy.
It was described by Donald Jay Padgett in 1999 with "Nuphar advena" as the type species.
Etymology.
The section name "Astylus" means without a style. The fruits of "Nuphar" sect. "Astylus" have broad necks, whereas fruits of "Nuphar" sect. "Nuphar" have narrow necks or "styles".
Distribution.
It is native to North America.
Fossil record.
The fossil species †"Nuphar carlquistii" from the early eocene of north-central Washington, USA has been identified as member of "Nuphar" sect. "Astylus".
Ecology.
Pollination.
The flowers are pollinated by flies, bees, and beetles.