Scape anatomy and its systematic implication in Allium stipitatum species complex (Amaryllidaceae)

19 July 2018

Mina, Khorasani; Saeidi Mehrvarz, Shahryar; Zarre, Shahin

Allium subg. Melanocrommyum as the second largest subgenus of Allium (Amaryllidaceae) encompasses several taxonomically difficult groups including A. stipitatum and allies with vague number of sections, subsections and species. We investigated the anatomical characters of scape in 12 species of this complex representing four recognized sections, Compactoprason, Megaloprason, Procerallium and Pseudoprason, and evaluated their systematic importance. The following features are found to be most informative in taxonomic classification of the complex at sectional and subsectional level: number of vascular bundles, and their conforming rings, diameter of scape (or the cross-sections), diameter of parenchymatous pith, thickness of sclerenchymatous ring and thickness of parenchymatous cortex. Statistical analyses (Kruskal-Wallis, ANOVA and principal components analysis) of 23 examined characters allow appropriate circumscription of species and sections in this species complex.