Nuphar sect. Astylus

Nuphar sect. Astylus is a section within the genus Nuphar native to North America.

Description

Vegetative characteristics

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.

Species

Nuphar advena
Nuphar polysepala
Nuphar variegata
Nuphar sagittifolia
Nuphar carlquistii
Nuphar ulvacea
Nuphar orbiculata
''Nuphar ozarkana''

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.