Comparative Analysis of Complete Chloroplast Genomes of Penstemon digitalis Nutt. ex Sims and Insights into Phylogenetic Relationships of Penstemon
Background: Penstemon, a core genus of the tribe Cheloneae in Plantaginaceae, possesses significant ecological and horticultural value. However, its interspecific phylogenetic relationships remain unclear due to morphological convergence, hybridization events, and limited genomic resources. This study aimed to characte...