Abstract
The lectotypes of Achillea chillea santolina L. and A. falcata L. (Achillea sect. Achillea) have been confrmed to be in the Clifford Herbarium. A. santolina L. cannot be retained as the generitype, and the selection of A. millefolium L. instead is confirmed. The species concept of the Linnaean A. santolina did not correspond to the post-Linnaean usage of this name. In most cases, A. santolina L. had been confused with A. wilhelmii C. Koch, but morphological differences separate those two species distinctly. The only extant element of A. falcata L. is found in the Clifford Herbarium, and this specimen corresponds principally to what is considered to be A. falcata today. Deviation in leaf structures is due to this material being of cultivated origin.
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