Title

Systematic studies on Philippine trichoglottis blume (orchidaceae)

Date of Publication

2002

Document Type

Dissertation

Degree Name

Doctor of Philosophy in Biology

Subject Categories

Botany

College

College of Science

Department/Unit

Biology

Thesis Adviser

Domingo A. Madulid

Defense Panel Chair

Minda Follosco Edmiston

Defense Panel Member

Emelina H. Mandia
Reynaldo Dela Paz
Justo Rojo
Josefina De Jesus

Abstract/Summary

The morphology, root and leaf anatomy, and pollen exine sculpture of the different species of Trichoglottis s.l. are investigated, characterized and analyzed to determine phenetic and phylogenetic relationships and derive an infrageneric classification of the taxa. Results showed continuous variation in the morphology, anatomy, and pollen surface of the species. Using principal components analysis and cluster analysis, floral characters yielded valuable basis for delimiting clusters which include 2 main groups (i.e. group 1: narrow dorsal sepal, shorter dorsal and lateral sepals, shorter midlobe, also pendulous or erect, short or long inflorescence with medium to large flowers). Phylogenetic analysis yielded the same groupings with a transition state consisting of distinct morphological characters (i.e. adnation of sidelobes, length of pedicels, and type of habit). These analyses suggest that the length of inflorescence and type of habit, as recognized by contemporary botanists, i.e. Christenson (1994), Fessel and Lueckel (1998), Fessel and Balzer (1999), Su (2001), and Cootes (2001), are a weak basis for a natural classification of separate genera.Based on these evidence, it is proposed that Staurochilus be formally reduced to a synonym of Trichoglottis and two sections, i.e. Trichoglotties and Stauropsis be established. A total of 21 species and 4 varieties are recognized and described. Three new species and 2 varieties are proposed.

Abstract Format

html

Language

English

Format

Print

Accession Number

TG03248

Shelf Location

Archives, The Learning Commons, 12F Henry Sy Sr. Hall

Physical Description

375 leaves

Keywords

Orchids--Varieties; Plant morphology; Plant varieties; Plant anatomy

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