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A Biosystematic Monograph Of The Genus Nuphar Sm (Nymphaeaceae), Donald Jay Padgett

Doctoral Dissertations

The genus Nuphar (Nymphaeaceae) comprises 10 perennial species native to freshwaters of the Northern Hemisphere. This taxonomic assessment utilizes morphometric analyses, cladistic analyses of morphology, nuclear and chloroplast DNA sequences, evaluation of randomly amplified polymorphic DNA, and pollen fertility estimations. Evolutionary reconstructions position Nuphar at the base of the family, most closely allied to Barclaya. Phylogenetic estimates within Nuphar indicate two major evolutionary lines, largely congruent with present biogeographical distributions that indicate an Old World/New World divergence. Accordingly, the genus is subdivided into two sections, Nuphar and Astylata. Section Nuphar includes the type of the genus, N. lutea, as well …

Systematics Of The Hamamelidaceae Based On Morphological And Molecular Evidence, Jianhua Li

Doctoral Dissertations

The Hamamelidaceae are a plant family of 31 genera and more than 140 species distributed in both the Old and New worlds. There has long been debate about the subfamilial, tribal, as well as generic, relationships within the family.

Parsimony analysis was performed to examine the relationships in the Hamamelidaceae based on morphology, and DNA sequences of the Internal Transcribed spacers (ITS) of nuclear ribosomal DNA, and the chloroplast matK gene. The morphology-based phylogeny shows weak support for all clades except for the Altingioideae, and differs greatly from the molecular phylogenies. Phylogenies based on the matK and ITS data are …