Chamaesyce maculata

Basic information
Scientific name	Chamaesyce maculata	Click to magnify
Major synonym	Euphorbia supina
Common names	Milk purslane, Prostrate spurge
Higher taxon	Euphorbiaceae, Malpighiales, Magnoliopsida, Magnoliophyta
Natural range	North America.
Habitat	Farm area, lawn, grass land, vacancy, riverside, etc.

Invasion information
Range in Japan	Almost entire Japan
Origin	Unknown.
Date	The first record was in 1895.
Route	Accidental: Details unknown.
Impact	Competition against native species, crops, lawn grass. Parasite (insect, fungi). Native organism(s) affected: Native grasses (e.g., Chamaesyce humifusa), crops, lawn grass, etc.
Regulation in Japan	No action for prevention, mitigation, control, or eradication.
Introduced range in other countries	East Asia, New Zealand.

Reference	Notes
Osada (1976) Colored Illustrations of Naturalized Plants of Japan. Hoikusha, Osaka. Satake et al. (1982) Wild Flowers of Japan, Herbaceous Plants [II]. Heibonsha, Tokyo (in Jpn) Shimizu (ed) (2003) Naturalized Plants of Japan. Heibonsha, Tokyo (in Jpn) etc.