Annual aromatic herbs, much branched. Heads solitary, either heterogamous with white rayed female flowers or homogamous and lacking rays.
Leaves 2-3-pinnatisect, repeatedly divided into segments which are narrowly linear.
Receptacle conical, hollow, lacking receptacular scales. Achenes obovoid, somewhat laterally flattened, obliquely truncate above, inconspicuously 3-5-ribbed on the posterior face and without oil glands on the anterior. Pappus a membranous rim or 0.
Similar to Tripleurospermum and differing in the hollow receptacle and the details of the achenes. Britain: 7 taxa. |
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