Xanthocyparis (formerly Callitropsis Oerst. 1864), a genus containing one Vietnamese species and one North American species
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Neocallitropsis (formerly Callitropsis Compton 1922), a monotypic genus endemic to New Caledonia
There are several rare, threatened plant species in the area, including the Ben Lomond wallflower (Erysimum teretifolium), the Ben Lomond spineflower (Chorizanthe pungens ssp. hartwegiana), and the Santa Cruz cypress (Callitropsis abramsiana).