Floral Morphology and Chromosome Characteristics of Bamboo Orchid from Menoreh Hills, Kulonprogo

Purpose: One of the most common orchids in Menoreh Hills, Kulonprogo is bamboo (Arundina). This genus has only one species but a wide variety flower phenotypic that spreads around world. The aims this research were to characterize morphology and chromosome content from Menoreh, related their taxonomic status. Research Method: Observation morphological characters was carried out assist identification process orchid species. squashing method used preparation chromosomes. results analyzed with Image Raster 3.0, Corel Draw 11 Ms. Excel 2010. Findings: Bamboo white sepals petals, tips are yellowish brown. Labellum white, thin purple stripe on edges, base yellow. Chromosomes number 2n = 20, formula karyotype 2x 20 16m + 4sm. Chromosomes’ absolute length 0.55-1.64 μm relative lengths 0.57-1.615 μm. Based characters, Menoreh's similarities A. graminifolia, whereas based chromosomes formula, it different. Limitations: There flowers However, sample collection limited Purwosari village, Kulonprogo. Value: potential be new variant graminifolia population, differences chromosomal characters.