The Collaborative International Dictionary of English v.0.48:
Chamaemelum \Chamaemelum\ n. a small genus of plants sometimes included in genus Anthemis; chamomile. Syn: genus Chamaemelum. [WordNet 1.5]WordNet (r) 3.0 (2006):
Chamaemelum n 1: small genus of plants sometimes included in genus Anthemis: chamomile [syn: Chamaemelum, genus Chamaemelum]