Abstract
SummaryThe North American Prairie plant Liatris aspera Michx. (Compositae: Eupatorieae: Liatrinae) is illustrated and described. The tribe Eupatorieae, subtribe Liatrinae and the genus Liatris Gaertn. ex Schreb. are discussed, along with comments on cultivated members of the tribe, and the position of Liatris aspera in the genus indicated, as well as the existence of sympatry with two other species, and the presence of natural hybrids between the three. Notes on cultivation, propagation, pests and diseases and availability of L. aspera are given, along with indications of the distribution of the species, its habitat and ecology, etymology, phenology, conservation status and known vernacular names. The lack of type material of Liatris aspera Michx. and Liatris spheroidea [sic!] Michx. in Paris, the acceptance of infraspecific taxa in Liatris aspera, and the controversy over the ability to age plants via ‘growth rings’, are discussed, along with concerns how early research might have been covered by ‘guilt‐free collection’.
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