A phylogenetic analysis of the Aristolochioideae (Aristolochiaceae).
Item
-
Title
-
A phylogenetic analysis of the Aristolochioideae (Aristolochiaceae).
-
Identifier
-
AAI9917651
-
identifier
-
9917651
-
Creator
-
Gonzalez, Favio Antonio.
-
Contributor
-
Adviser: Dennis W. Stevenson
-
Date
-
1999
-
Language
-
English
-
Publisher
-
City University of New York.
-
Subject
-
Biology, Botany | Biology, Plant Physiology
-
Abstract
-
A cladistic analysis of the subfamily Aristolochioideae (Aristolochiaceae) is presented, along with the results on studies on inflorescences and floral morphology and development, and pollen morphology in the subfamily. In chapter one, the history of the classification of the subfamily is reviewed. In chapter two, a comparative morphological study of the inflorescences throughout the family Aristolochiaceae is presented. In chapter three the studies on floral development and morphology are presented; these studies were foccussed on the perianth and the gynostemium, the two floral structures that have been crucial for the classification of the subfamily. The results support the interpretation of the perianth of Aristolochia, Euglypha and Holostylis as a trimerous calyx. Five main types of perianth development were found, which differ in the degree of fusion between the perianth lobes, the direction of the floral curvature, and the symmetry of the perianth limb. The results also show that carpellary tissue participates in the formation of the gynostemium. Complementary studies on floral morphology of the remaining members of the Aristolochiaceae, Saruma, Asarum and Thottea, are included. Chapter four deals with the results of a survey on pollen morphology, which was carried out in order to search for additional characters. In chapter five, a cladistic analysis based on morphological characters is presented. The analysis includes 65 taxa within the in-group, which represent all the tribes, subtribes, genera and infrageneric taxa formally described within the subfamily Aristolochioideae sensu Schmidt (1935). The analysis shows that Aristolochia s. l. is paraphyletic, and that Euglypha and Holostylis are not different lineages from Aristolochia. Two of the three subgenera traditionally recognized within Aristolochia are shown to be monophyletic. The third subgenus is paraphyletic. Taxa at lower rank levels (sections, subsections, series and subseries) are shown to be poly- or paraphyletic. The characters traditionally used for the recognition of these taxa are evaluated, and new characters are introduced. Finally, a new system of classification of the Aristolochioideae consisting of four genera and a number of lower rank taxa is proposed on the basis of the monophyletic groups obtained from the analysis.
-
Type
-
dissertation
-
Source
-
PQT Legacy CUNY.xlsx
-
degree
-
Ph.D.
