*Euphorbia cyparissias Linnaeus. Phen: Mar-May (occasionally later). Hab: Roadbanks, graveyards, waste places. Dist: Native of Europe.
Origin/Endemic status: Europe
Other Comments: Rarely producing seeds, so a relatively "well-behaved weed", tending to spread only vegetatively from plantings.
Synonymy: = Ar, C, F, FNA12, G, GrPl, Il, K1, K3, K4, Mi, NE, NY, Pa, RAB, Tn, Va, W, WV, Govaerts, Frodin, & Radcliffe-Smith (2000); = Galarhoeus cyparissias (L.) Small ex Rydb. – S; = Tithymalus cyparissias (L.) Lam.