• Scientific Name: Hydrocleys nymphoides (Humb. & Bonpl. ex Willd.) Buchenau
• Ref: Abh. Naturwiss. Vereins Bremen 2:2. 1871
• Synonyms: Duhamelia odorata Willd. ex Schult.; Hydrocleys azurea Schult.f.; H. commersonii Rich.; H. humboldtii (Rich.) Endl.; Limnocharis commersonii (Rich.) Spreng.; L. humboldtii Rich.; L. nymphoides (Humb. & Bonpl. ex Willd.) Micheli; Vespuccia humboldtii (Rich.) Parl.; Stratiotes nymphoides Humb. & Bonpl. ex Willd.
• English Common Name: waterpoppy, water-poppy
• Chinese Common Name: 水金英 shuǐ∙jīnyīng, 水罂粟 shuǐ∙yīngsù
• Japanese Common Name: ミズヒナゲシ [水雛罌粟/水雛芥子] mizuhinageshi
• Family: Alismataceae
• Genus: Hydrocleys
• Distribution: native to S America
• Photo: 06/21/2009, South China Botanical Garden, Guangdong

Herbs, to 50 cm; stolons to 45 cm. Leaves: petioles 1.5--40 cm × 0.9--9 mm, sheathing base to 8.5 cm; blade broadly ovate to orbiculate, 1.4--11.9 × 0.9--10.6 cm, veins 5--9. Inflorescences with 1--6 flowers, proliferating with stolons, leaves; peduncles to 30 cm × 1.5--6 mm; bracts elliptic, 2--4.5 × 0.4--1 cm, apex obtuse; pedicels spreading, 3.5--17.5 cm × 1.5--6 mm. Flowers ca. 6.5 cm wide; sepals 13--28 × 7--13 mm; petals spreading, pale yellow to white with yellow base, 2.3--2.6 × 3.8--4.1 cm; stamens 20--25; staminodes 20+; pistils 5--8, 10 mm. Fruits 10--14.5 × 2--3.5 mm; beak 3.5--5.5 mm. Seeds ca. 1 mm, sparsely glandular-pubescent, glandular trichomes 0.15 mm, 150--200 mm apart, not present on every epidermal cell of seed coat. (FNA Vol. 22)

06/21/2009, South China Botanical Garden