Morphological variations of terrestrial orchid Thelymitra javanica Blume (Orchidaceae Orchidoideae) in Mount Arjuno, Lawu, and Sumbing, Java - Indonesia

The study of morphological variations of Thelymitra javanica was conducted in Mount Arjuno, Lawu, and Sumbing. The aims of this study were to observe morphological variations and phenetic relationships of T. javanica from the three mountains. Thirteen samples were colected along the tracking routes, morphological observation was based on character of root, tuber, leaf, peduncle/scape, floral bract, flower, fruit, and seed. The data were compile descriptively to identify variations that subsequently scored. Dendrogram were constructed by UPGMA clastering method with Percent’s Similarity algorithm, while Principal Component Analysis was done with Euclidean Distance algorithm using MVSP v.3.1. software. The result shows that morphological variations of T. javanica is found to be plastis for size and color, especially color of peduncle, petals, labellum, ovarium, and ovary ribs that can be used to separate distinct population. KEYWORDS: ecotype, Orchidaceae, phenetic, plasticity, Thelymitra javanica