Abstract
SectionSideritisis an extremely diversified group which is formed mainly by species growing at low altitude. The group of high altitude taxa of this section is polyphyletic and has been taxonomically divided in different subsections in which these taxa appear normally associated with low-lying planitiary ones, the latter being the probable ancestors. The subsections comprising high altitude taxa are: subsect.Gymnocarpae, subsect.Fruticulosae; subsect.Hyssopifoliae, subsect.Luridae; subsect.Borgiaeand subsect.Aranensis. Most of the high altitude taxa of sectionSideritisare endemics with small distribution areas; they are incompletely known and threatened with extinction. The upper altitude limit of this section is attained at over 3000 m in Sierra Nevada (Spain) bySideritis glacialisBoisswhich has been included in subsect.FruticulosaeObón and D. Rivera. The taxonomy of this complex group of high altitude endemic taxa ofSideritissubsectionFruticulosaeis discussed on the basis of macro-morphological and micro-morphological characters. These are used in identification keys and for analysis of dissimilarity. The different habitats, allied species and plant communities are described. The following taxa are recognizedSideritis glacialissubsp.glacialis,S. glacialissubsp.vestita,S. glacialissubsp.virensandS. glacialissubsp.fontquerii.
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