Phylogenetic placement of the enigmatic angiosperm Hydrostachys

Citation
Dc. Albach et al., Phylogenetic placement of the enigmatic angiosperm Hydrostachys, TAXON, 50(3), 2001, pp. 781-805
Citations number
77
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Plant Sciences
Journal title
TAXON
ISSN journal
0040-0262 → ACNP
Volume
50
Issue
3
Year of publication
2001
Pages
781 - 805
Database
ISI
SICI code
0040-0262(200108)50:3<781:PPOTEA>2.0.ZU;2-1
Abstract
Hydrostachys, an enigmatic aquatic plant genus from Madagascar and southern to central Africa, has been suggested to be related to Lamiales based on e mbryology, whereas rbcL sequences have indicated a relationship with Hydran geaceae (Cornales). We investigated these hypotheses by combining rbcL with atpB and ndhF sequences and increased taxon sampling in Hydrangeaceae comp ared to previous analyses. Rates and patterns of molecular evolution vary a cross ndhF with the 3 ' portion giving a different result than the 5 ' port ion. The highly divergent sequences of Hydrostachys make phylogenetic place ment difficult, but maximum parsimony and maximum likelihood analyses of co mbined data sets agree in placing Hydrostachys within Hydrangeaceae, as do separate analyses of rbcL, atpB, and the 5 ' portion of ndhF. Few morpholog ical and embryological characters support this relationship.