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Species Delimitation in the Symphyotrichum subulatum Group (Asteraceae) Reveals a New Species in Central Mexico

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Abstract—

Symphyotrichum (Asteraceae) is a well-circumscribed genus on the basis of morphological and molecular data, but species boundaries remain poorly understood. Here, the species delimitation of the contentious Symphyotrichum subulatum group (Symphyotrichum subg. Astropolium) is illuminated using morphometric, phylogenomic, and geographical analyses. Symphyotrichum mexicanum sp. nov., a new species endemic to central Mexico, is described and distinguished from Symphyotrichum expansum based on its morphometric attributes, phylogenetic placement, geographic range, and ecological specialization.

Keywords: Compositae; Symphyotrichum mexicanum; Symphyotrichum subgenus Astropolium; morphometrics; phylogenomics

Document Type: Research Article

Affiliations: 1Department of Biological Sciences, 295 Lee Boulevard, Mississippi State, Mississippi 39762, USA; ; [email protected]; [email protected], Email: [email protected]

Publication date: December 22, 2023

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