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Walker, Colin C.
(2017).
Abstract
Dragon trees (Dracaena species) are updated since the last synopsis (Walker, 2001) with three new subspecies being newly described. Dracaena draco subsp. caboverdeana is endemic to the Cape Verde Islands, leaving subsp. draco restricted to the Canary Islands and Madeira. Dracaena serrulata subsp. dhofarica is endemic to the Dhofar Province of Oman. Dracaena serrulata subsp. mccoyorum is endemic to Saudi Arabia, where it occurs near the summit of a single mountain and hence is assessed as being on the brink of extinction.