Thirty‐seven species representing eight of the nine subtribes of the tribe Inuloideae‐Compositae were examined for the presence of crystals in the achene wall, fibers within the phloem, and schizogenous resin canals in the aerial stem. Leaf hair type and the size of the widest xylem element were also recorded for each species. These comparative observations point to the presence of two major groups which are completely obscured by current taxonomic practice. Comparative palynological and cytological data already in the literature are readily interpreted in the light of this suggested grouping.
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Drury et al. (1966) studied this question.