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Kivonat:

Present study provides the taxonomic description of three new local endemic hybridogenous species of the genus Sorbus from Hungary, named Sorbus acutiserratus, Sorbus dracofolius and Sorbus vallerubusensis. The new species include Sorbus latifolia-group (Subg. Tormaria) probably apomictic taxa evolved from hybridization between Sorbus torminalis and a member of Sorbus aria-group. Each species grow in Vértes Mountains on Upper Triassic dolomite, Sorbus acutiserratus can be found near Gánt (Kőhányás), Sorbus dracofolius is known near Gánt (Kápolnapuszta), Sorbus vallerubusensis grows near Csákberény.

Description of the species:

Sorbus acutiserratus: Leaves ovate, broadly-ovate; lower surface greenish-grey tomentose. Lobes acute, margin of lobes conspicuously acutely, roughly serrate. Leaf of short fertile shoot typicaly ovate, 80–90(–100) mm long, 65–90(–100) mm broad with 9–10 veins. The length of top margin of the longest lobe (7–)8–9 mm. Base bluntly cuneate or nearly rounded. Leaf of the short sterile shoot ovate, 70–80 mm long, 55–75 mm broad with (9–)10 veins and cuneate base. The length of top margin of the longest lobe 6–7(–8) mm. Fruits pomiform, (9–)10(–11) mm long, (11–) 12 (–13) mm broad, dorsiventraly flated, always broader than long, red.

Sorbus dracofolius: Leaves deltoid or deltoid-lanceolate to rhombic; lower surface greyish-green tomentose. Lobes short, acute, margin of lobes finely serrate. Leaf of the short fertile shoot (80–)90–90(–110) mm long, (50–)65–70(–75) mm broad with 9–10 veins. The length of top margin of the longest lobe is 5–6 mm. Base cuneate. Leaf of the short sterile shoot is 70–100 mm long, 50–70 mm broad with 8–10 veins and cuneate leaf-blade base. The length of top margin of the longest lobe 4–5(–6) mm. Fruits pomiform, (11–)12(–13) mm long, (9–)11(–12) mm broad, always longer than broad, brownish-red.

Sorbus vallerubusensis: Leaves ovate, elliptic; lower surface relatively densely whitish-grey tomentose. Lobes short, finely acuminate. Leaf of the short fertile shoot (85–)90–100(–110) mm long, 65–75(–80) mm broad with 8–9 veins. The length of top margin of the longest lobe (4–)5–6(–7) mm. Base rounded or bluntly cuneate. Leaf of the short sterile shoot (70–)80(–90) mm mm long, 55–65 mm broad with 8–9 veins and base rounded. The length of top margin of the longest lobe 4–5 mm. Fruits pomiform, (8–)9(–10) mm long, (10–) 11(–12) mm broad, always a little bit broader than long, brownish-red.

The holotypes of the new species were deposited in Carpato-Pannonicum collection of the Hungarian Natural History Museum in Budapest (Sorbus acutiserratus – BP 694171, Sorbus dracofolius – BP 694170, Sorbus vallerubusensis – BP 694172).