WordNet sense 1 (poinsettia of United States and eastern Mexico; often confused with Euphorbia heterophylla):

fire-on-the-mountain, Euphorbia cyathophora, Mexican fire plant

WordNet sense 2 (tropical American plant having poisonous milk and showy tapering usually scarlet petallike leaves surrounding small yellow flowers):

poinsettia, Christmas flower, Christmas star, Euphorbia pulcherrima, lobster plant, Mexican flameleaf