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| Lysimachia yulongensis Z.K.Wu & Ming Y.Sheng, in Sheng, Yang, Shuai, Chen, Yin et Wu, 2026. |
Abstract
Lysimachia yulongensis Z.K.Wu & Ming Y.Sheng, a new species of Primulaceae from Yunnan, China, is described and illustrated. Morphological evidence places L. yulongensis within Lysimachia sect. Pumilae, which is distinguished by dwarf plants with prostrate or nearly erect habits, few flowers clustered at the stem apex or solitary in the leaf axils near the apex, lanceolate sepals, elliptical and dorsifixed anthers and styles approximately as long as the stamens. The new species is characterised by a strongly stoloniferous growth habit, with creeping stems serving a vegetative function as stolon and terminating in leaf rosettes during fruiting; leaves that are narrowly elliptic to oblanceolate or spatulate; and flowers solitary in the leaf axils along obliquely ascending stems. Information on the distribution, phenology and conservation status of the new species is also provided.
Key words: Conservation status, diversity, nomenclature, taxonomy, yu long zhen zhu cai, Yunnan
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| Lysimachia yulongensis sp. nov. A, B. Habitat; C, D. Habit during flowering; E. Habit during fruiting with stolons; F. Leaves, the left three: lower surface, the right three: upper surface; G. Flower with calyx; H. Dissected corolla showing anthers and stigmas; I. Young fruits. Photographed by Zhikun Wu. |
Lysimachia yulongensis Z.K.Wu & Ming Y.Sheng, sp. nov.
Diagnosis. The new species exhibits a floral morphology similar to that of Lysimachia prolifera and L. pumila, characterised by dwarf plants with creeping or nearly erect habits, few flowers clustered at the stem apex or solitary in leaf axils, lanceolate sepals, elliptical and dorsifixed anthers. However, it can be distinguished from these two species by several morphological features: a strongly stoloniferous growth habit, with creeping stems serving a vegetative function as stolon and terminating in a leaf rosette during fruiting; narrowly elliptic to oblanceolate or spatulate leaves; and flowers solitary in leaf axils along obliquely ascending stems.
Etymology. The specific epithet of the new species is taken from the Chinese Pinyin ”Yulong”, the name of the mountain in north-western Yunnan, China, where the type specimen was collected (Map 1).
Ming-yun Sheng, Wu-hai Yang, Tian Shuai, Yu-fan Chen, Li-juan Yin, Zhi-kun Wu. 2026. Lysimachia yulongensis (Primulaceae), A New Species in Lysimachia sect. Pumilae from Yunnan, China. PhytoKeys 270: 155-164. DOI: doi.org/10.3897/phytokeys.270.177773
