Meconopsis heterophylla Bentham, Trans. Hort. Soc. London, ser. 2, 1: 408. 1835; M. crassifolia Bentham; Papaver crassifolium (Bentham) Greene; P. heterophyllum (Bentham) Greene; P. heterophyllum var. crassifolium (Bentham) Jepson

Plants 30-60 cm, glabrous or sometimes sparsely pilose proximally. Leaves 2-12 cm; blade with primary lobes 5-13, remote. Inflorescences: peduncle 5-20 cm. Flowers: sepals 4-10 mm; petals orange-red, spotted purple at base, 1-2 cm. Capsules 1-2 cm. Seeds 0.4 mm. 2 n = 56.

Flowering spring (Apr-May). Grassy areas, openings in chaparral; less than 1200 m; Calif.; Mexico (Baja California).