Galium zaisanicum (Rubiaceae), a new species from Zaisan depression (Republic of Kazakhstan)
Ekaterina A. Pinzhenina1, Andrey N. Kupriyanov2
1Central Siberian Botanical Garden, SB RAS, Novosibirsk, Russia
2Federal Research Center of Coal and Chemistry, SB RAS, Kemerovo, Russia
Keywords: new species, Galium zaisanicum, section Galium, Rubiaceae, diagnostic characters, holotype, Kiin-Kerish clay, Zaisan depression, Eastern Kazakhstan
Abstract
Galium zaisanicum Pinzhenina et Kupr. is described as a new species from East Kazakhstan from section Galium. G. zaisanicum grows in Zaisan depression on Kiin-Kerish clays. The material was collected in the East Kazakhstan region of the Republic of Kazakhstan in the intermountain depression, on the clays of Kiin-Kerish. G. zaisanicum shows an external morphological similarity with species G. ruthenicum Willd., G. saurense Litv., but differs by tomentose of stem, length of internodes, shape and pubescence of leaves, shape of corolla lobes, pubescence of corolla, shape of anthers, and sculpture of fruit surface. Data on the surface sculpture of the mericarpies confirm the close relationship of the species G. zaisanicum, G. ruthenicum and G. saurense Litv. G. zaisanicum grows in fine-grained areas with an admixture of quartz sand and kaolin clay scour products in semi-desert communities involving members of the families Poaceae, Amaranthaceae, Asteraceae. For the new species, the holotype, isotypes and paratypes are given. Detailed description, discribution, ecologi, illustrationsas as well as a comparison with morphologically similar species are provided.
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