Taraxacum sect. Austropaludosa, a new section allied to T. sect. Palustria (Compositae, Crepidinae)

Abstract

AbstractThe broadly understood Taraxacum sect. Palustria was examined and found heterogeneous on the basis of a new ample material from the Balkan Peninsula. A group of eighteen species was recognized, characterized by achenes usually densely spinulose and abruptly to subabruptly narrowing in the cone, appressed or loosely appressed outer phyllaries numerous, often imbricate or subimbricate, with an evenly deep to dark olivaceous‐green abaxial surface and a conspicuous, very narrow whitish border, polliniferous anthers and triploidy. The relatively clear‐cut group is described as a new section, Taraxacum sect. Austropaludosa. Members of the new section are distributed in central and eastern Balkan Peninsula, Turkey, southernmost Ukraine, one species reaches Iran and Iraq; only a single species occupies a Central European geographical range. Two new species are described, T. (Austropaludosa) favorabile from Bulgaria and North Macedonia, characterized by a broadly winged petiole, outer phyllaries appressed to loosely appressed ovate‐lanceolate, dark olivaceous‐green, with a distinct but very narrow whitish border, and T. (Palustria) siticulosum from Bulgaria, a species allied to T. scaturiginosum and T. lilianae, distinct in having very numerous outer phyllaries, often distally erect‐arcuate, almost entire leaf lobes, and short achenes with a ± cylindrical cone only 0.5–0.8 mm long.