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Nuphar advena:
Spatterdock, cow lily
Nuphar advena (Ait.) Ait.f.: Spatterdock, yellow water lily, cow lily. Nymphaeaceae (water-lily family).
Native perennial. The whole plant is stout and robust, a denizen of slow-moving shallow water and areas of wet muck. Thick rhizomes grow in the substrate, increasing to 4 in (10 cm) in diameter; they are often rough and marked with crescent-shaped leaf scars. Leaves can be submersed, floating flat on the water, or held above the surface. The large leaf blades have an elongated heart-shape, but are less than twice as long as wide, 6 - 14 in (15 - 35 cm) long and 5 - 10 in (12.5 - 25 cm) wide. Leaves have long rounded lobes at the base; the margins are smooth to wavy. The wide midrib is flat to concave; side veins, parallel to each other, emerge all along its length. The cylindrical spongy leaf stalk grows to 3 ft (90 cm) long; it attaches to the leaf blade at the deep basal indentation or notch. Spherical-looking yellow flowers are borne above water on stout stems up to 6 ft (1.8 m) long. The cupped petals surround a flat yellow disk that becomes the top of a ridged, green or yellow, pot-shaped fruit. Leaves, flowers, and fruit differ from the related Nymphaea waterlilies.
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