Dioon angustifolium is a species of cycad that is endemic to Tamaulipas and Nuevo León, Mexico.
Plants occur in two main areas:
the Sierra Madre Oriental and the Sierra de San Carlos, Sierra Tamaulipas
low hills in the vicinity of Soto la Marina, Tamaulipas
Media related to Dioon angustifolium at Wikimedia Commons
Data related to Dioon angustifolium at Wikispecies
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