Euphorbia peplus and Euphorbia heterophylla, in order Malpighiales.
Principally of the genus Asclepias in order Gentianales, family Apocynaceae
A monarch butterfly (Danaus spp).
Also of the genus Calotropis in order Gentianales, family Apocynaceae
Any plant of the genus Euphorbia, a diverse genus of over 2,000 species.
To emit foam; to froth; said of the emission of yeast from beer during fermentation.