Article

The Sedum acre group comprises the small, herbaceous, perennial and annual, yellow-flowered, Eurasian Sedum species, except for S. assyriacum and S. nanum from the Near East, and the North African species of S. sect. Monanthella; in total, 16 species belonging to four comparia, or series:. S. ser. Acria, ser. Alpestria, ser. Litorea, and ser. Samia. Recent phytochemical and molecular studies indicate that the S. acre group is probably paraphyletic, though il belongs to a distinct and doubtless monophyletic lineage of the Sedoideae, the so-called S. acre lineage. -A cladistic analysis of 62 morphological characters of the 16 species of the group is presented. The significance of the resulting phylogeny is discussed in relation to cytological and phytochemical data and the distribution of the taxa.