Rediscovery of Pimpinella crispulifolla (Apiaceae) after one century, and its new phylogenetic placement in Sium

Pimpinella crispulifolia, a species known only from the holotype locality (Laoguishan of Shilin County) collected in 1906, was rediscovered in Luquan County of Kunming City, China. To examine its systematic position, a phylogenetic reconstruction was performed based on nrDNA internal transcribed spacer (ITS) region under the framework phylogeny of Apiaceae subfamily Apioideae. It showed an affinity to Slum species of Oenantheae. Morphological similarity is reflected in its fascicled roots, simple pinnate leaves, long and reflexed styles, and ovoid, laterally compressed fruits with prominent and corky-thickened ribs. Therefore, a new combination of Slum crispulifolium aide Boissieu) J. Zhou is proposed with full taxonomic treatments. Its morphological description is also amended and completed with both living individuals and newly collected specimens.

Automated summary

Pimpinella crispulifolia, originally collected in 1906 from Laoguishan in Shilin County, China, was recently rediscovered in Luquan County of Kunming City. Through phylogenetic reconstruction and morphological analysis, it was determined to have an affinity to Slum species of Oenantheae, resulting in a proposed new combination name, Slum crispulifolium.