一品红亚属 yi pin hong ya shu

Poinsettia Graham, Edinburgh New Philos. J. 20: 412. 1836.

Shrubs or herbs. Stems mostly herbaceous, sometimes becoming woody. Leaves alternate; stipules very small, usually caducous. Cyathia in congested terminal cymes; cyathophylls often unequal, sometimes leaflike, often colored; cyathial glands 1, rarely 2 or 3, narrow, often cupular or 2-lipped, without appendages. Seeds with or without caruncles.

About 20 species: predominantly a New World group but with one almost ubiquitous ornamental plus a few very widely distributed, weedy annuals that are ± pantropical; five species (one endemic, three introduced) in China.

Lower Taxa

• Euphorbia cyathophora Murray
• Euphorbia dentata Michaux
• Euphorbia hainanensis Croizat
• Euphorbia heterophylla Linnaeus
• Euphorbia pulcherrima Willdenow ex Klotzsch