New Species of Phoradendron (Viscaceae) from Mexico and Guatemala and a Synopsis of Species in Section Pauciflorae


As presently interpreted Phoradendron section Paucifiorae consists of 15 species. These mistletoes parasitize primarily conifers. We describe seven new species, make status changes for four species, and provide information on the hosts and distribution of all members of the section. New species described are: Phoradendron abietinurn Wiens, on Abies durangensi s in Chihuahua, Durango, and Jalisco, Mexico; P. acuminatum Wiens, on Cupressus lusitanica in Guatemala; P. flavomarginatum Wiens, on Juniperus fiaccida in Nuevo León, Mexico; P. lta wksworthii Wiens, on Juniperus in New Mexico, west Texas, and Coahuila, Mexico; P. olivae Wiens, on Cupressus lusitanica in Colima and Jalisco, Mexico; P. rufescens Wiens, on Juniperus spp . in San Luis Potosí, Mexico; and P. sedifolium Wiens on Cupressus lusitanica in Chiapas, and Hidalgo, Mexico. Three taxa previously recognized as subspecies are raised to specific rank: P. densum Torr. ex Trel., P. paucifiorum Torr., and P. libocedri (Engelm.) Howell. Also P. saltillense Trel., which had been placed in synonymy under P. botleanum subsp. densum, is accorded species status. In addition, three new epiparastic species of Phoradendron are described. Epiparastic mistletoes are known to parasitize only other species of mistletoes—in this instance Phoradendron or Cladocolea (Loranthaceae)

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