Cover Story: 

As a species-rich, cosmopolitan genus, Allium comprises 15 subgenera and ~1000 species. Evolutionary radiation has resulted in extensive morphological and genetic polymorphisms within this genus, consequently magnifying the challenges of reconstructing a well-resolved phylogeny. In this issue, two papers on Allium may exemplify how to solve some of these longstanding puzzles. Jang et al. examine flower characteristics to provide key taxonomic information for subgenus delimitation and Zhang et al. use the phylotranscriptomic approach to produce a strongly-supported species tree for the subg. Cyathophora.

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