On the identity of Thymus humifusus var. aureopunctatus (Lamiaceae) and taxonomic notes on the Th. richardii complex

The name Thymus humifusus var. aureopunctatus, described from Bosnia and Herzegovina, is lectotypified, and its taxonomic value is discussed. Thymus richardii subsp. richardii is currently considered an endemic subspecies common to Mallorca (Balearic Islands) and Bosnia and Herzegovina from the Balkan Peninsula. Specimens identified as Th. richardii from both Balearic Islands and Bosnia and Herzegovina were studied to determine if they are indeed the same taxonomic entity. Detailed micromorphological observations and morphometric analysis, suggest that the Balkan plants (Th. humifusus var. aureopunctatus) and the Majorcan populations (Th. richardii subsp. richardii) are clearly separate entities. For the former name, based on morphological, phytochemical, biogeographical and present results, we propose the subspecific rank, as Th. richardii subsp. aureopunctatus comb. & stat. nov. Full descriptions of all five subspecies currently accepted within Th. richardii are provided.