| Morphological relationships among species orchids is necessary to orchid breeder in obtaining good hybrids in perennial plants. Closely related among species orchids would increase their crossing opportunity. The objectives of this study was to classify orchid into cluster according to their similarities in phenotypic characters. The phenotypic characters observed were plant height (cm), leaf length (cm), leaf width (cm), ratio of leaf length and leaf width, number of flowers per inflorescence, lenght of flower stalk (cm), flower diameter (cm), sepala lenght (cm), leaf colour, type of pseudobulb growth and flower aroma. Relationships among 16 types of species orchids was analyzed according to Cluster Analysis with Agglomerative method (Everitt, 1993). The cluster analysis showed that Phalaenopsis consist of one cluster, based on the similarities in type of pseudobulb growth, characteristics of plant height and leaf, number of flowers per inflorescence, length of flower stalk, flower diameter and sepal length. Dendrobium consist of four clusters, because of the difference of flower characteristics. Meanwhile, B. Lobii, A. miniatum, Vanda tricolor, and G. scriptumon has one cluster, respectively. |