Nutlet structures of subsection Fragiles of the genus Stachys (Lamiaceae) from Turkey and their systematic applications
Nutlet structures of subsection Fragiles of the genus Stachys (Lamiaceae) from Turkey and their systematic applications
This paper includes the morphological and anatomical characters of the nutlets of 7 endemic species of the subsection Fragilesof the genus Stachys (Lamiaceae) from Turkey and the systematic significance of these characteristics, using one-way analysis of varianceand cluster and principal component analyses. Morphological characters such as the dimensions, shapes, colors, and surfaces of thenutlets were studied using light and scanning electron microscopes. The structures and thicknesses of the pericarp and endospermlayers, as well as the sizes of the cotyledon in the nutlets, were anatomically studied. The outcomes revealed that the taxa vary fromeach other in terms of nutlet shape and color. The nutlet dimensions range from 1.31 mm to 3.49 mm in length and from 0.84 mm to1.95 mm in width. While Stachys longiflora and S. pseudopinardii have the largest nutlets, S. chasmosericea has the smallest. The nutletsurface ornamentation was recorded as 5 types: reticulate, scalariform, reticulate-foveate, ruminate, and rugose. The most common typeis reticulate; however, the other ornamentation types are specific for the studied taxa. Anatomically, the structure and thickness of thepericarp parts and the endosperm and the size of the cotyledon are very important characteristics that disclose interspecific relationswithin the studied taxa. A key is presented for the identification of the examined taxa based on the nutlet properties.
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