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chloranthous

chloranthous, a. Bot.
  (klɒˈrænθəs)
  [f. chlor-1 + Gr. ἄνθ-ος flower + -ous.]
  Having green flowers.
  Hence chloˈranthy, a condition of regressive metamorphosis of a plant in which the coloured floral organs return to the colour and condition of leaves, as in the green rose, green flowers of Pyrethrum, etc.

1871 Thiselton Dyer in Jrnl. Bot. IX. 19 A kind of corymb of chloranthous flowers.

Oxford English Dictionary

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