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Leaf architecture of mindanao cinnamon (Cinnamomum mindanaense Elm.) in Cebu Island, Philippines

Research Paper | January 1, 2019

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Roi O. Engkong, Rhona Mae G. Manco, Mico D. Rosatace, Glynis Anne C. Vega, Jay P. Picardal, Esperanza Maribel G. Agoo

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J. Bio. Env. Sci.14( 1), 240-256, January 2019


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The use of leaf architecture in defining plant species has been recognized as an important tool in cinnamon taxonomy. However, available literature on the use of leaf architecture for Philippine cinnamon focused only on describing interspecies variability while intraspecies variation of economically-important Philippine cinnamon species is still unreported to date. This study assessed leaf morphological data, developed a general template of the leaves of C. mindanaense based on observable foliar characters and identified intraspecific similarities and differences of C. mindanaense leaves based on leaf architecture. We utilized 22 leaf morphological characters to examine C. mindanaense leaves (30 mature trees) obtained from (a) Nug-as, Alcoy, (b) Cansuje, Argao and (c) San Antonio, Boljoon, Cebu. Leaf architecture comparison was evaluated through quantitative comparison while pattern similarity was analyzed by Image J analysis software. Principal Component Analysis and Cluster Analysis were utilized to identify characters useful for identification and analyze extent of resemblance among morphometric data. Results show that the continuous characters (e.g. leaf length and width) of old vs young leaves were more variable compared to the discrete characters, namely: primary, secondary, tertiary, quaternary and pentary vein categories, areole shape, areole development, veinlets, blade margin, presence of petiole, venation pattern and midrib structures. The study concluded that these discrete characters may define, morphologically, C. mindanaense as a species.


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Leaf architecture of mindanao cinnamon (Cinnamomum mindanaense Elm.) in Cebu Island, Philippines

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