Euphorbia cyathophora - poinsettia of United States and eastern Mexico; often confused with Euphorbia heterophylla. Euphorbia - type genus of the Euphorbiaceae: very large genus of diverse plants all having milky juice.
Euphorbia cyathophora usually having milky often poisonous juice.
Life cycle - annual, the plant grow upto 2ft tall; flowers - orange bracts. Bright red leaf surfaces near the flowers are much showier than the flowers themselves.
Light sun and ordinary garden soil. From seed germinate at room temperature. Self-seeds moderately in the garden.