Phacellanthus (Orobanchaceae), a newly recorded genus in Taiwan

A heretofore unrecorded holoparasite Phacellanthus tubiflorus Siebold & Zucc. (Orobanchaceae)
was recently discovered in Taiwan. It represents a new genus for the island and is distinguishable from related
holoparasitic taxa such as Aeginetia, Christisonia, Boschniakia, and Orobanche by a combination of characters:
stems with many scale-like leaves, inflorescence subcapitate or subcorymbose with 4-6 flowers, corolla
white, and elongate, slender corolla-tube. Phacellanthus tubiflorus is rare on Taiwan, with no more than two
dozen individuals occurring in the cloud zone of a mixed Chamaecyparis/broadleaved forest at 1,800-2,000 m
elevation. This paper provides a taxonomic account of Phacellanthus and illustrations to aid in identification.