Cytisus polonicus Sennikov & Val.N.Tikhom., 2024

Sennikov, Alexander N. & Tikhomirov, Valery N., 2024, Atlas Florae Europaeae notes, 33. Taxonomic synopsis of East European species of the Cytisus ratisbonensis group (Fabaceae), PhytoKeys 238, pp. 157-197 : 157

7. Cytisus polonicus Sennikov & Val.N.Tikhom. sp. nov.

- Chamecytisus ratisbonensis auct.: Tzvelev 1989; Fedoronchuk 2022.

Type.

Poland. " Regio Cracoviensis : inter pagum Zabierzów et vicum Szczyglice, ad declive abruptum loessicum, 17.05.1973, A. Pałkowa & T. Tacik [Flora Poloniae Exsiccata No. 636] (holotype H1293884; isolectotypes KRAM249040 and distributed to other herbaria). Fig. 7 .

Etymology.

The new species is named after Poland, the country of its main distribution and type locality.

Description.

Prostrate shrubs up to 20 cm above ground with long branches. Leaves with obovate to elliptic leaflets, glabrous above, with appressed hairs 0.4-0.8 mm long below, petioles densely covered with appressed hairs. Flowers strictly lateral, 1-4 in axils, on pedicels 3-5(7) mm long, pale yellow; calyx (7)8-10 mm long, with (laxly) appressed hairs 0.6-0.8(1) mm long; standard suborbicular, glabrous above.

Distribution.

Europe: Poland, Ukraine. Its occurrence in western Belarus is expected due to the presence in Poland, 15 km from the border.

Ecology.

The species occurs in dry meadows or on calcareous denudations, on open slopes of hills and mountain foothills.

Chromosome counts.

2n = 24 ( Zieliński (1975), as Cytisus ratisbonensis subsp. ratisbonensis ); material from native populations collected in Poland; vouchers at KOR and partly at KRAM.

Notes on taxonomy and distribution.

This species is most similar to C. ratisbonensis , from which it differs by its smaller flowers and shorter pubescence. It replaces the latter species in southern and eastern Poland and Ukraine.

Figures

Figure 7. Holotype of Cytisus polonicus Sennikov & Val. N. Tikhom.