Revision of Fothergilla (Hamamelidaceae), including resurrection of F. parvifolia and a new species, F. milleri

By

Haynes, Jake
Phillips, Whitney
Krings, Alexander, 1972-
Lynch, Nathan
Ranney, Thomas

Type

Article

Date of Publication

2020

Original Publication

PhytoKeys

Volume

144

Pages

57--80

Subjects

Coastal Plain , Fothergilleae , Hamamelidoideae , Southeastern United States

Contributed by

Pensoft Publishers

Language

English

Published by

Sofia, Bulgaria Pensoft Publishers [2010]-

Identifiers

DOI: https://doi.org/10.3897/phytokeys.144.49589

 

Abstract

Fothergillais a small genus of deciduous shrubs native to the southeastern United States that depending on circumscription comprises two to four species. Recent treatments recognized only two species in the genus:F. gardenii(tetraploid) andF. major(hexaploid). Until recently, no diploid taxon ofFothergillawas known. However, recent investigations identified a number of diploid populations in Alabama, Florida, Georgia, and South Carolina. A subsequent phylogenomic analysis showed that the diploids segregated into two, well-supported lineages, corresponding to largely allopatric populations. A re-examination of the morphology of diploid plants, in combination with the genetic evidence, has led us to the recognition of two species of diploids in the genus – a resurrectedF. parvifoliaand a new species (F. milleriW.D. Phillips & J.E. Haynes,sp. nov.) – bringing the total number of recognized species inFothergillato four. A revised taxonomic treatment of the genus is provided.