Cousinia х pavlovii (Asteraceae), a new intersectional hybrid from Central Asia

Based on materials collected in the southern part of Syrdarya Karatau (Boraldai Mountains) and in the low mountains of Talas Alatau, as well as herbarium specimens kept in the Central Herbarium of Uzbekistan (TASH), a new interspecific and intersection hybrid Cousinia х pavlovii Kupr., Lashchinskiy et A.L. Ebel, nothosp. nov. is described. Parent species are Cousinia triflora Schrenk (section Oligantha Juz.) and C. umbrosa Bunge (section Pseudarctium Juz.) This nothospecies differs from the first parent species (C. triflora) by wider anthodia, phyllaries with a point bent at the top, and purple anthers. It differs from the second parent species (c. umbrosa) in usually sessile leathery stem leaves with a spike at the apex, narrower anthodia, phyllaries with narrow-walled bordering and stalked glands along the edge, pale yellow or fawn color of the corolla. It differs from C. triacantha Kult. in smaller, less-flowered floral heads, and the absence of spines along the edge of the phyllaries. Probable cause of hybridization is the transformation of valley communities as a result of overgrazing.

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