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 (Aiton) W.T.Aiton as the type species.
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.
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