Vegetative diversity in Philippine hoyas (Subfamily Asclepiadoideae, Family Apocynaceae)

Date

4-2009

Degree

Bachelor of Science in Biology

Major Course

Major in Systematics

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Annalee S Hadsall

Co-adviser

Simeona V. Siar

Abstract

Live and herbarium specimens of 29 Philippine Hoya species, endemic as well as indigenous, were subjected to phenetic investigation and cluster analysis using 32 vegetative characters. With similarity coefficient of 0.8726, H. heuschkeliana and H. bilobata are the most similar species. Conversely, H. crassicaulis and H. bilobata are the most distinct species having 4.5602 similarity coefficient. Clustering of H. bilobata, H. burtoniae, and H. heuschkeliana coincides with the species in Section Acanthostemma. Likewise, two pairs of similar species were supported by two sections: H benguetensis and H. camphorifolia by H pottsii Traill Complex; and H ciliata and H. madulidii by Eriostemma. Moreover, majority of Laguna-Quezon species sampled formed a distinct grouping. Occurrence of Hoya in the Philippines was plotted and showed that the taxon thrives in ten biogeographical zones with greatest concentration in Quezon Province. Climograms showed that some morphological features are correlated with the climatic condition of a locality. whenever the plant is not in the reproductive stage. This study provided additional Hoya. It was noted that using vegetative characters assists species identification information useful for taxonomists, breeders, and hobbyists. The vegetative morphology was able to define the interspecific relationship in Hoya. It was noted that using vegetative characters assists species identification whenever the plant is not in the reproductive stage. This study provided additional information useful for taxonomists, and hobbyists.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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