of the same colour; usually used to describe those Asteraceae that bear a 1-coloured inflorescence, i.e. head, the disc and ray florets being the same colour. cf. heterochromous
• (a.) Having all the florets in the same flower head of the same color.
Ho`mo·chro'mous adjective [ Homo- + Greek ... color.] (Botany) Having all the florets in the same flower head of the same color. 
homochromous Being of just one color.
being all of one color, as a composite flower or flower head.