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This report lists all the conifers and flowering plants occurring in the Crater District of Haleakala National Park. Two hundred and five species and varieties were recorded of which 120 are endemic, 11 are indigenous, and 119 are exotic. Thirty-eight of the species are unique to Haleakala Crater and its environs. At least six species previously found in the area are now absent; three of the six species are now extinct. There are 15 weed species in the area which are potentially serious pests; five of the species are on the State of Hawaii list of noxious weeds. Four resource management recommendations are made to promote the survival of the native flora.