Morphological diversity of Kratom (Mitragyna speciosa (Korth) Havil) at population level in Southern Thailand
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Abstract
The objective of this research was to study the diversity of kratom subpopulation in the Southern Thailand using morphological characteristics for classification. Study on kratom specimens in 9 provinces in the area of Southern Thailand: Surat Thani, Nakhon Si Thammarat, Trang, Phatthalung, Krabi, Phang Nga, Chumphon, Prachuap Khiri Khan and Ranong. Record of ecosystem and morphological characteristics. Data were analyzed and a dendrogram using the UPGMA technique. It was found that kratom can be divided into 2 large groups: 1) Group of green petiole includes green, yellow-green and green-yellow colors 2) group of red petiole includes red, red-orange, pink-orange colors. Leaf shape can be classified into 3 types: lanceolate, obvate and obovate. Leaf base can be classified into 3 types: cuneate, obtuse and cordate. Leaf apex can be classified into 2 types: cuminate and cuspidate. Leaf margin can be classified into 2 types: entire and dentate. Stipule color can be classified into 3 groups: green and yellow-green group, orange-pink and pink-orange group and red-orange and red group. Therefore, it can be indicated that the Southern Thailand has a wide variety of kratom population with morphological differences.
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