Chondrilla and Willemetia have been hitherto treated as members of subtribe Crepidinae (Bremer 1994; Lack 2006). Also in the ITS phylogeny by Gemeinholzer & al. (in Kilian & al. 2009) the Chondrillinae and Crepidinae clades together formed a monophyletic group with full bootstrap and posterior probability support. However, since the sister-group relationsship of Crepidinae and Chondrillinae has been proven less stable when different molecular datasets (matK and nrITS) were combined (Gemeinholzer & al. unpubl.), Kilian & al. (2009) refrained from treating the Chondrilla alliance as a part of the subtribe Crepidinae.
Bremer K. 1994: Asteraceae. Cladistics and classification. – Portland: Timber.
Kilian N., Gemeinholzer B. & Lack H. W. 2009: Tribe Cichorieae. – In: Funk V. A., Susanna A., Stuessy T. & Bayer R. (ed.), Systematics, evolution, and biogeography of the Compositae. – Vienna: IAPT.
Kamari G. & Greuter W. 2000: Phitosia, a new genus for Crepis crocifolia (Compositae, Cichorieae), a local endemic of Mount Taigetos (Greece). – Bot. Chron. (Patras) 13: 11-36.
Lack H. W. 2006: Tribe Cichorieae Lam. & DC. – Pp. 180-199 in: Kadereit J. W. & Jeffrey C. (ed.), The families and genera of vascular plants 8. – Berlin: Springer.