Hadjikyriakou, G. & Hand, R.: Notes on Teucrium sect. Polium (Lamiaceae) in Cyprus. — Willdenowia 38: 111–125. — ISSN 0511-9618; © 2008 BGBM Berlin-Dahlem. doi:10.3372/wi.38.38106 (available via  http://dx.doi.org/)

Revision of an extensive herbarium material and detailed studies of plants in the field and in cultivation revealed that four species of Teucrium sect. Polium occur in Cyprus, all being endemic: T. cyprium is probably closely related to but not conspecific with the Libyan species T. davaeanum; T. kyreniae, originally treated as a subspecies of T. cyprium, is lifted to species rank; T. karpasiticum, a micro-endemic of the Karpasia peninsula, is described as new to science and is, probably, closely related to the fourth Cypriot species, T. micropodioides, the name of which is typified. Chromosome counts show that all four Cypriot species are tetraploid (2n = 26). Their relationships are discussed; indumentum characters support their placement in T. subsect. Rotundifolia.