Original paper

Pulling the skeleton out of the closet: resurrection of Phthirusa sensu Martius and consequent revival of Passovia (Loranthaceae)

Kuijt, Job


A return to the original conception of Phthirusa is proposed, and several species more recently placed in Ixocactus are added, the genus thus containing seven species in greatly disjunct populations in eastern Brazil, the northern Andes, and western Mexico; therefore the following names have been newly formed: Phthirusa exilis., Ph. hutchisonii., Ph. macrophylla and Ph. rhynchophylla. In consequence, the remaining species until recently placed in Phthirusa obtain the generic name Passovia. A synopsis of well-established species of the latter genus is provided, some with illustrations, including the presentation of seven new species., i. e. Passovia beckii., P. biloba., P. brasiliana., P. cordata., P. diffusa., P. ensifera., and P. subtilis. In addition the following new names have been formed: P. bisexualis, P. coarctata., P. disjectifolia., P. ovata., P. podoptera., P. pycnostachys., P. robusta., P. rufa., P. santaremensis and P. stelis. Attention is drawn to anther diversity in Passovia, at least one species (P. ensifera) being unique in Loranthaceae in this regard, and (except for P. cordata) unique in the genus in having alternating fertile stamens and staminodia. The importance of anther diversity is stressed by providing some illustrations of species not heretofore illustrated in the literature