Morphology and taxonomy of Polygonum cognatum Meisn.,P. alpestre C.A.Mey and allied taxa from Central Asia and the Caucasus (Polygonaceae)

Yurtseva, O.V.; Levina, M.S.; Severova, E.E.; Troitsky, A.V.

Авторы: Yurtseva O.V., Levina M.S., Severova E.E., Troitsky A.V.
Журнал: Wulfenia
Том: 19
Год издания: 2012
Издательство: Botanischer Garten des Landes Karnten
Местоположение издательства: Austria
Первая страница: 141
Последняя страница: 180
Аннотация: A taxonomic review of ser. Cognata Kom. distributed in South-West Asia, Central Asia and South Siberia is presented. A phylogenetic reconstruction of the genus Polygonum based on ITS1-5.8S-rDNA-ITS2 sequences demonstrated division on Polygonum in several clades, corresponding to: 1) section Duravia combined with Polygonella, 2) section Polygonum comprising the species from temperate climate regions of Nornern Hemisphere, 3) vast group of Middle and Central Asia species, including two members of section Pseudomollia – P. molliiforme and P. bornmuelleri nested among other species, what demands taxonomic revision of the group. Heterogeneity of ser. Cognata was evident with placing P. cognatum, P. myrtillifolium and P.serphyllaceum in one subclade and P. alpestre and P.fibrilliferum in other subclade. The morphological analysis of ser. Cognata using analysis of growth forms, leaves, ochrea, flowers, achenes, pollen grains revealed clear diagnostic differences which are extensively illustrated. Ser. Cognata Kom. is artifitial comprising three taxonomically distant spacies: 1) P. alpestre C.A.Mey. including P. ammanioides Jaub. et Spach, 2) P. fibrilliferum Komarov, 3) P. cognatum Meisn. (=P. rupestre Kar. et Kir.) including two varieties in addition to typical one: P. cognatum var. serpyllaceum (Jaub. et Spach) O.V. Yurtseva and P. cognatum var. myrtillifolium (Kom.) O.V. Yurtseva.
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Morphology and taxonomy of Polygonum cognatum Meisn.,P. alpestre C.A.Mey and allied taxa from Central Asia and the Caucasus (Polygonaceae)статья

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