Teucrium pumilum L., T. lepicephalum Pau, T. libanitis Schreber, T. turredanum Losa & Rivas Goday, and T. carolipaui Vicioso ex Pau (Labiatae) constitute an aggregate included in the Pumilum subsection (Polium section). These species are endemic and geographically restricted to central and south-eastern Spain. They grow under different climatic conditions and have different edaphic requirements, particularly the gypsum and lime affinities. The effects of some ecological factors (i.e. edaphic and climatic factors) on the germination parameters of these Teucrium species were investigated. The species under study differed in their germination behaviour. The majority of the germination parameters appeared more correlated to edaphic than to climatic factors and particularly to the water availability in the soil. The calcicolous T. carolipaui, which grows in the driest habitat, had a more rapid germination than the gypsophilous species. This could be due to the existence of a narrower optimal germination period for T. carolipaui. The different germination requirements of these species of Teucrium are important results to be considered in conservation programs of these endemic and endangered taxa.