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Nuphar shimadai, commonly known as yellow water lily, is a species of flowering plant in the family Nymphaeaceae, an endemic speciesn of Taiwan. The species is a kind of aquatic plants, which can be found in ponds or lakes. It is a perennial floating-leaved herb.The conservation status of Nuphar shimadai is critically endangered.

= Specific character =


 * Roots  Nuphar shimadai has stout and branched rhizomes.

The fruit of Nuphar shimadai is spherical.
 * Leaves  Leaves of Nuphar shimadai are broadly ovate, 8-12 cm long, 7-9 cm wide, with a rounded tip and a v-shaped notching base. Margin of leaves are entire. Smooth above while shaggy beneath. Depending on the depth of water, Nuphar shimadai have long petioles on the floating leaves.
 * Flowers  Nuphar shimadai has yellow flowers in the whole year, with straight pedicel raising the flower above the water. There are 5 ovate sepals, many petals and numerous stamens on the flower. The ovary is spherical and the stigma is red.
 * Fruits

= Locality = Nuphar shimadai can only be found in Taiwan. Few ponds in Taoyuan, Hsinchu, Nantou (Chichi), Yilan (Fushan).

= References =