The present study revealed: 1) seven different types of trichomes: conical, aseptate flagellate, filiform flagellate, 1-armed, 2-4-armed, bulbiferous flagellate, and glandular biseriate; 2) that 28 of the total of 38 species have trichomes in tufts; 3) six different types of stomata: anomocytic, anisocytic, cyclocytic, actinocytic, tetracytic, and staurocytic; 4) that some trichome types, such as 2-4-armed (B.
6) Bulbiferous flagellate trichomes: uniseriate, 5-6-celled, usually forming tufts or pilose nests with glandular trichomes.
Bulbiferous trichomes with flagellate apical cell of the medicinal species B.
dracunculifolia can be recognized among medicinal species by its bulbiferous trichomes with two subapical cell and 2-4-armed trichomes, respectively; 5) B.
heterophylla the trichomes are bulbiferous flagellate with taillike apical cell, as well as in B.