Delimitation of the genera Katapsuxis, Cnidiocarpa and Selinum (Umbelliferae) and the taxonomical synopsis
Abstract
In recent decades the circumscriptions of genera Cnidiocarpa, Katapsuxis and Selinum have been repeatedly revised. The nomenclature of these genera is connected with Cnidium and Ligusticum. The morphology, anatomy and micromorphology of fruits, and the morphology of leaf segments of all species of the genera Cnidiocarpa, Katapsuxis, Selinum, as well as Cnidium monnieri and Ligusticum scoticum have been studied in detail. The exocarp cells of Katapsuxis silaifolia have conical projections and papillae with a striato-knotted and rugulate surface. The fruits of Ligusticum scoticum are covered with large convex cells with a rugulate cuticle. The Cnidium monnieri fruits are covered by a continuous scabrous wax layer that masks cuticular foldings. In other species, the boundaries of the cells are indistinct or visible only on some areas of the surface, the cuticle is striate and rugulate, and wax is absent. On the basis of the obtained observations and previously published molecular phylogenetic studies, Cnidiocarpa, Katapsuxis and Selinum were shown to be separate genera, substantially distant from the type species of Cnidium and Ligusticum. Keys have been compiled to identify the abovementioned genera, their species, and (in the case of Katapsuxis silaifolia) varieties, the synonyms are listed, and distribution data are given. The most important diagnostic features are the micromorphology of the fruit surface, the shape and dissection of the leaf segments, the shape of the leaf sheaths, the shape of the stylopodia, the length of the styles, and the secretory ducts number.
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