Botanica Pacifica. A journal of plant science and conservation 2026. Preprint
Article first published online: 18 SEP 2026 | DOI: 10.17581/bp.2026.15213
Survey of the genus Adoxa (Viburnaceae) in Northeast Asia: taxonomical diversity and a new species
Marina N. Koldaeva
Botanical Garden-Institute FEB RAS, Vladivostok, Russia
The article examines the species diversity and taxonomic position of known Adoxaceae (Viburnaceae) species. Currently, the genus Adoxa comprises 4 accepted species; the taxonomic status of 3 other species remains disputed. Based on comparative morphological analysis, a new species from Trans-Baikal Territory, Adoxa itegriloba sp. nov., has been identified, described, and illustrated. It is characterized by an entire or entire-lobed blade of stem and rosette leaves, with lobes remaining entire even when the rosette leaf blade is dissected or divided. The upper flower is tetramerous, with the formula Ca(2)Co(4)A4G(4); the lateral flower is pentamerous, with Ca(3)Co(5)A5G(5), similarly to A. moschatellina, but the stamens have entire (unsplit) filaments. The new species possibly originated through hybridization between the Holarctic A. moschatellina and the disjunctly distributed South Siberian–Far Eastern relict A. orientalis. The occurrence in Trans-Baikal Territory of A. itegriloba with its original leaf blade structure, along with the relict A. orientalis and the widely distributed A. moschatellina, allows the mountainous regions of the upper reaches of the Amur basin to be regarded as a secondary center of species diversity of the genus Adoxa.
Колдаева М.Н. Обзор рода Adoxa (Viburnaceae) в северо-восточной Азии: таксономическое разнообразие и новый вид. Рассмотрено видовое разнообразие и таксономическое положение известных видов Adoxaceae (Viburnaceae). В настоящее время род Adoxa включает 4 вида; таксономический статус 3 других видов остается дискуссионным. На основании сравнительно-морфологического анализа с территории Забайкальского края выявлен, описан и проиллюстрирован новый вид Adoxa itegriloba sp. nov. Он характеризуется цельной или цельно-лопастной пластинкой стеблевых и розеточных листьев, при этом в случае рассечённой или раздельной пластинки розеточных листьев ее лопасти остаются цельными. Верхний цветок тетрамерный, с формулой Ca(2)Co(4)A4G(4); боковой цветок пентамерный, с формулой Ca(3)Co(5)A5G(5), как у A. moschatellina, однако тычинки имеют цельные (нерасщеплённые) нити. Предполагается, что новый вид мог возникнуть в результате гибридизации между голарктическим A. moschatellina и дизъюнктивно распространённым южносибирско-дальневосточным реликтовым видом A. orientalis. Произрастание в Забайкальском крае A. itegriloba с оригинальным строением листовых пластинок наряду с реликтовым A. orientalis и широко распространенным A. moschatellina позволяет рассматривать горные районы верховий бассейна Амура в качестве вторичного центра видового разнообразия рода Adoxa.
Keywords: Adoxa moschatellina, Adoxa orientalis, morphology, origin, taxonomy, Забайкальский край, морфология, происхождение, таксономия
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