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Hylomecon vernalis
Hylomecon japonica.jpg
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
Order: Ranunculales
Family: Papaveraceae
Genus: Hylomecon
Species: H. vernalis
Binomial name
Hylomecon vernalis
  • Chelidonium japonicum Thunb.
  • Chelidonium vernale (Maxim.) Ohwi
  • Hylomecon japonica (Thunb.) Prantl

Hylomecon vernalis, also known as the forest poppy, is a poppy of the Far East, ranging from Manchuria to Japan.

This poppy is a perennial that spreads via rhizomes, typically no taller than 30 cm. The pinnate leaves usually have five soft green leaflets, although three and seven occur as well, each with a shape ranging from lanceolate-oblong to rhombic, and a pattern of distinct teeth along the margins. The flowers are bright yellow 3.5-5 cm across, starting out bowl-shaped, then flattening out with age.

Its typical habitat is moist shaded woodland, growing in accumulated humus.

Although generally considered a monotypic genus, the species is somewhat variable, and several variations have been named as separate species.


  • Christopher Grey-Wilson, Poppies (Portland: Timber Press, 2000) ISBN 0-88192-503-9 pp. 40-41