Yellow Water Lily
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Nuphar lutea
Common & widespread in Britain.
The 11–20 obovate inconspicuous petals with a rounded apex are 7.5–23 mm long. The androecium consists of numerous stamens with 4–7 mm long, yellow anthers.
The sulcate, spheroidal pollen grains are 26–50 μm long.
The gynoecium consists of 5-20 carpels.
The stigmatic disk with an entire margin is 7–19 mm wide.
The urceolate, green, 2.6–4.5 cm long, and 1.9–3.4 cm wide fruit, which is enclosed in persistent sepals, bears up to 400 ovoid, olive green, 3.5–5 mm long, and 3.5 mm wide seeds.
Flowers from June-September.