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- Title
Species delimitation, phylogenetic relationships, and two new species in the Cuscuta gracillima complex (Convolvulaceae).
- Authors
Costea, Mihai; Aiston, Fiona; Stefanović, Saša
- Abstract
Basic morphology, scanning electron microscopy, and DNA sequence data from the plastid trnL–F region and the nuclear internal transcribed spacer (ITS) regions were used to delimit the species of a recently circumscribed clade of Cuscuta (Convolvulaceae) and to investigate their phylogenetic relationships. This clade comprises the Cuscuta gracillima complex from Mexico, Central and northern South America, a group which is characterized by inflorescences that appear to emerge directly from the host stem. Eight lineages are recognized, with two of them described here as new species: Cuscuta punana Costea & Stefanović, sp. nov. from Ecuador and Cuscuta vandevenderi Costea & Stefanović, sp. nov. from Mexico. Cuscuta colombiana Yunck is redefined to include Cuscuta aristeguietae Yunck., and Cuscuta deltoidea Yunck. is broadened to encompass Cuscuta serruloba Yunck. A taxonomic treatment with an identification key, descriptions, and illustrations is provided; the biogeography and conservation status of the eight species are also discussed.
- Subjects
MEXICO; ECUADOR; CUSCUTACEAE; ELECTRON microscopy; CONVOLVULACEAE; NUCLEIC acids
- Publication
Botany, 2008, Vol 86, Issue 7, p670
- ISSN
1916-2790
- Publication type
Article
- DOI
10.1139/B08-030