Coexistence of succulent tree aloes: partitioning of bird pollinators by floral traits and flowering phenology

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African aloe ecology: A review (2012, background): “Thus, given the scarcity of genetic barriers to hybridization in aloes, it is likely that these differences enable a larger number of Aloe species to coexist than would otherwise be possible (Botes et al., 2008).”
Current perspectives on the economic botany of the genus Aloe L. (Xanthorrhoeaceae) (2011, background): “Phytochemical characterisation of the leaf mesophyll of A. davyana Schönland (= A. greatheadii var. davyana (Schönland) Glen & D.S.Hardy) (Botes et al., 2008b) suggests this species may be targeted for commercial development in South Africa.”
Hyper-specialization for long-billed bird pollination in a guild of South African plants: the Malachite Sunbird pollination syndrome (2009, background): “Plant species are adapted for placing pollen on the tongue, bill, crown, throat, or feet of birds and each requires a different floral morphology to do so (Johnson, 1996; Pauw, 1998; Johnson and Brown, 2004; Wester and Claßen-Bockhoff, 2006; Botes et al., 2008).”