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Scentless. Chamomile or Scentless. Mayweed (Tripleurospermum inodorum [syn. Matricaria inodora]), an annual or short-lived perennial originally native to Eurasia but now widely naturalised in the temperate zones. In many places it is considered to be a weed, usually of waste ground. Without very close examination, it can be very difficult to differentiate between the various. Anthemis, Chamaemelum, Matricaria, Tripleurospermum. The dome-shaped rather than conical receptacles of the mature flowerheads, as seen here, are one of the identifying characteristics of Tripleurospermum inodorum. tripleurospermum-3530htm'>Tripleurospermum.