Abstract
While performing vegetation surveys in the southern part of the Lena delta, a new species of Carex from section Phacocystis has been found. Morphologically, Carex delongii sp. nov. is most close to C. cespitosa and C. minuta but differs from the former in smaller inflorescences, shorter pistillate spikes, narrow and soft leaves, oblong-ovoid (vs. ovoid) utricles; from the latter, it is distinguished by having smaller spikes and larger utricles. This relationship is also confirmed by molecular data. A detailed description of Carex delongii, its comparison with related species, illustrations, characteristics of habitat and phylogenetic position are reported.
Highlights
Carex L. is the largest genus in the family Cyperaceae (Govaerts et al, 2020)
nov. is most close to C. cespitosa
it is distinguished by having smaller spikes
Summary
Carex L. (about 2000 species) is the largest genus in the family Cyperaceae (Govaerts et al, 2020). (about 2000 species) is the largest genus in the family Cyperaceae (Govaerts et al, 2020). There are about 116 to 147 species and subspecies of this section in the world (Benítez‐ Benítez et al, 2021), 24 of them found in Asian Russia (Shekhovtsova, 2012). During the vegetation surveys of 2017 to 2019 in the southern part of the Lena River delta we found a few unusual specimens of Carex from section Phacocystis on three neighboring islands: ArgaBilir-Aryta, Kurungnakh, and Samoylov. We describe these specimens as a new species
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