Leaf Architecture of Selected Philippine Cinnamomum Schaeff. (Lauraceae) Species

Dhiocel A. Celadiña; Inocencio E. Buot, Jr.; Domingo A. Madulid; Tito T. Evangelista; Danilo N. Tandang

Authors

Dhiocel A. Celadiña College of Forestry and Environmental Sciences, Western Philippines University, Aborlan, Palawan, Philippines
Inocencio E. Buot, Jr. Institute of Biological Sciences, College of Arts and Sciences, University of the Philippines Los Baños and Faculty of Management and Development Studies, University of the Philippines Open University, Los Baños, Laguna, Philippines
Domingo A. Madulid Philippine National Herbarium, National Museum, Manila, Philippines
Tito T. Evangelista Philippine National Herbarium, National Museum, Manila, Philippines
Danilo N. Tandang Philippine National Herbarium, National Museum, Manila, Philippines

Keywords:

leaf architecture, Philippine Cinnamomum, venation characteristics, PCA, Cluster Analysis

Abstract

The characteristic leaf architecture of selected Philippine Cinnamomum species was studied. A description of each selected taxon is presented, and a dichotomous key is provided for quick reference. Marginal ultimate venation separates the selected taxa into two major groups: (1) the fimbrial marginal ultimate vein group comprised of Cinnamomum perglabrum, C. mindanaense, C. subcuneatum, C. myrianthum, and C. zeylanicum, and (2) the looped marginal ultimate vein group comprised of C. oblongum, C. iners, C. mercadoi and C. celebicum. The marginal ultimate venation, 2° vein angle, 4° and 5° vein categories, areolation and FEVs are the most useful diagnostic characteristics of the selected Philippine Cinnamomum species while apex-base shape and angle, and laminar shape are also helpful in separating species from each other. Cluster and Principal Component analyses supported the major groupings. The latter ascertained that leaf venation patterns are very good diagnostic characteristics. The unifying and distinguishing morphometrics of the species were established, and it is shown that venation character states are good taxonomic markers in describing and identifying Philippine Cinnamomum species.

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