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Leaf Architectural Study of Hoya coriacea, Hoya halconensis and Hoya buotii (Apocynaceae)

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Author Affiliations

  • 1Plant Biology Division, Institute of Biological Sciences, College of Arts and Sciences, University of the Philippines Los Baños, Laguna, PHILIPPINES

Int. Res. J. Biological Sci., Volume 3, Issue (3), Pages 37-44, March,10 (2014)

Abstract

Leaf architecture characters of the three seemingly similar and hence, controversial species of Hoya, namely H. coriacea, H. halconensis and H. buotii were examined. The use of leaf architecture has been demonstrated in paleobotanical studies and other systematic studies to resolve some taxonomic controversies. These characters were used to analyze the similarities and differences of the three Hoya species. The seven characters, leaf base, margin, form, blade class, primary vein size, variation of angle of divergence and areole development, showed to be distinct from either one or two species. Unweighted Pair Group Method with Arithmetic Averages (UPGMA) and Single Linkage were used for cluster analysis. Both results showed that H. coriacea and H. buotii shared more similar characters than H. halconensis. Elliptic to narrow elliptic form, convex leaf base and stout primary vein size were characteristics common to H. coriacea and H. buotii whereas both H. halconensis and H. buotii had leaves with nearly uniform angle of divergence. Moreover, H. coriacea and H. halconensis have moderately developed areoles while H. buotii had well-developed ones. The study showed that variations in leaf architecture characters can be used to illustrate the relationship among the three species of Hoya.

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