Nuphar lutea

Lansdown, Richard & Ruhsam, Markus, 2022, YELLOW WATER LILIES (NUPHAR, NYMPHAEACEAE) IN GREAT BRITAIN: A NEW HYBRID, A REAPPRAISAL OF RECORDS, AND A REVISED STATUS OF N. ADVENA, Edinburgh Journal of Botany 79 (1925), pp. 1-15 : 10

Nuphar lutea (L.) Sm

Most leaves submerged or floating, occasionally emergent but these scattered or patchy within stands ( Figure 10 ), typically persistent at least until September; petiole triangular in section ( Figure 6 C ). Sepals 5, the 2 or 3 outer mainly green, the 3 inner yellow with a green patch at the base ( Figure 7 C ). Filaments 5.4–9 mm, whitish to pale yellow; anthers 4.8–12 mm, yellow with two lines of yellow pollen ( Figure 8 C ); ratio of anther to filament length, 0.55–1.5. Capsules very frequent, urceolate.

Nuphar lutea is widespread and locally abundant throughout Scotland north of the Great Glen but sparse at higher altitudes ( Preston et al., 2002).

Figures

Figure 6. A, Petiole shape of Nuphar advena from NA1 population, Spottiswoode Loch. B, Petiole shape of Nuphar × porphyranthera from NH8 population, Oulten Park (left); NH6 population, Shropham Ponds (centre); and NH1 population, West Hoathly (right). C, Petiole shape of Nuphar lutea (no population code), Elterwater. Scale bars are approximate (no measurements of the photographed features were taken). Photographs: R. V. Lansdown.

Figure 7. Sepals of: A, Nuphar advena from NA1 population, Spottiswoode Loch; B, Nuphar × porphyranthera from NH8 population, Oulten Park (left), and NH2 population, Godstone (right); C, N. lutea (no population code), Norbotten, Sweden. Scale bars are approximate (no measurements of the photographed features were taken). Photographs: R. V. Lansdown.

Figure 8. Flowers and stamens of: A, Nuphar advena from NA1 population, Spottiswoode Loch; B, Nuphar × porphyranthera from NH8 population, Oulten Park (left), and NH1 population, West Hoathly (right); C, N. lutea (no population code), Elterwater (left) and Pop1 population, Ashtead (right). Scale bars are approximate (no measurements of the photographed features were taken). Photographs: R. V. Lansdown.

Figure 10. Nuphar lutea leaves: A, in July 2021 with a high proportion of emergent leaves, from Pop5 population, Carlingwark Loch, England; B, in August 2020 with a mixture of emergent and floating leaves, from Pop1 population, Ashtead Park, England; C, in July 2021 with submerged and floating leaves, from (no population code) Elterwater, England. Photographs: R. V. Lansdown.