Morphology and distribution of trichomes in two endemic Teucrium species of Macaronesia

Summary The morphology and the distribution of the trichomes on the vegetative and reproductive organs of two endemic Teucrium species of Macaronesia (T. betonicum and T. heterophyllum) were studied by SEM. Both species possess an indumentum constituted by long, morphologically different non-glandu- lar trichomes and three types of glandular ones, differently distributed, depending on the organ studied. The particular distribution of the glandular trichomes on the inner surface of the corolla and on the anther filament seems to be of taxonomical importance.