The Collaborative International Dictionary of English v.0.48:
Atropa \Atropa\ n. a genus of plants of the nightshade family, including the belladonna (Atropa belladonna). Syn: genus Atropa. [WordNet 1.5]WordNet (r) 3.0 (2006):
Atropa n 1: belladonna [syn: Atropa, genus Atropa]