Stipa × czerepanovii Kotukhov (1998b: 13)

Nobis, Marcin & Gudkova, Polina D., 2016, Taxonomic notes on feather grasses (Poaceae: Stipa) from eastern Kazakhstan with typification of seven names and one new combination, Phytotaxa 245 (1), pp. 31-42 : 33

4. Stipa × czerepanovii Kotukhov (1998b: 13) pro sp. Type citation:—Depressio Zaissanica denudatinies argillarum tertiariarum Akseir (maryo orientalis) jugi parve declivitas australi-occidentalis glareoso-argillosa, 17 VII 1993, Ju. Kotuchov (LE)

Type (original label):—Zaisanskaya kotlovina, obnazheniya tretichnykh glin Akseir (vostochnaya okraina), yugo-zapadnyi galechnoglinistyi sklon gryady, 17 VII 1993, Yu. Kotukhov (lectotype LE!, designated by Nobis & Gudkova 2011: 199, isolectotypes KRA 436047! KRA 436048!, KUZ! 9 sheets, LE!).

We consider Stipa ×czerepanovii to be a hybrid, originating from hybridization between S. richteriana Karelin & Kirilov (1841: 862) and S. orientalis . Stipa × czerepanovii is known from two locations, the Akseir Mts ( Kotukhov 1998b) and the southwestern part of Balkhash Lake ( Nobis et al. 2015a). At the locality near Balkhash Lake, it was found growing together with S. orientalis and S. richteriana ( Nobis et al. 2015a) . Length of ligules of vegetative shoots, pilosity of leaves, length of callus, length of anthecium, and length of hairs on the awn of S. × czerepanovii are intermediate in comparison with the parental species.

Stipa × czerepanovii is morphologically most similar to S. sczerbakovii . They differ mainly in the length of the callus (1.2–1.6 mm long in S. × czerepanovii vs. 1.5–2.6 mm long in S. sczerbakovii ), length of hairs on awn column (0.3–0.7 mm long in S. × czerepanovii vs. less than 0.3 mm long in S. sczerbakovii ), and seta with hairs 1–1.5 mm long in S. × czerepanovii vs. 0.6–1.3 mm long in S. sczerbakovii ( Nobis et al. 2015a) .