60. Diaperia Nutt.

Three species, southwestern U.S. and adjacent Mexico.

The generic classification of the so-called Filago group is still unsettled and the small segregate Diaperia has been resurrected only recently. Diaperia often has been included in Evax Gaertn. (Cronquist, 1980), which often has been included in Filago L. (Anderberg, 1991, 1994; Arriagada, 1998). Morefield (1992, 2004) took a cladistic approach and attempted to recognize a number of smaller, monophyletic groups as genera. According to his studies, the alternative to splitting the subtribe Filagininae Bentham & Hook. f. into numerous small genera that are very difficult to circumscribe morphologically is to combine virtually the entire group into a single, morphologically heterogeneous Filago, an approach that Morefield (1992) considered relatively uninformative.