Different types of trichomes of Phlomoides A short simple non-glandular trichomes (P. macrophylla) B short simple non-glandular trichomes (P. breviflora) C long simple non-glandular trichomes (P. henryi) D symmetrically non-glandular stellate (P. breviflora) E non-glandular stellate with central long branch (P. bracteosa) F bi- or trifurcate non-glandular stellate (P. nyalamensis) G sub-sessile/ sessile glandular trichomes (P. macrophylla) H simple glandular trichomes of (P. bracteosa) I branched glandular trichomes (P. breviflora).