Stem anatomical survey of the genera Matricaria and Tripleurospermum (Asteraceae) from Turkey with its taxonomical and ecological implications

A comparative anatomical study of the stems in 32 taxa assigned two related genera; Matricaria (4 taxa) and Tripleurospermum (28 taxa, 30 accessions), was carried out Turkey by using cluster analysis (CA) principal component (PCA) to address generic classification delimitation. All studied have following stem characteristics: one layer epidermal cells with a sparse distribution non-glandular trichomes, cortex composed interchanging collenchyma chlorenchyma cells, number schizogenous secretory ducts near bundles, ovate oblong open collateral vascular bundles which are arranged ring variable size, parenchymatous pith. The differences among mainly thickness xylem bundle, length pith cell size. taxonomic ecological values data discussed light current framework.