Castilleja holmgrenii is described from several collections made in the Sierra Madre Occidental in southeast Sinaloa and adjacent southwest Durango, Mexico. The new species is a member of subgenus and section Castilleja. This apparently rare species is presently known from two small, geographically restricted populations. Also provided are a list of the Castilleja species of this region with notes on their status and distribution, a key for their identification, and nomenclatural and taxonomic notes concerning some of the species.
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Vol. 54 • No. 1