Glandular Trichomes in Marrubium cephalanthum ssp montanum (Lamiaceae) Growing in Turkey

Abstract

In the present investigation, glandular trichomes on the several organs of endemic Marrubium cephalanthum Boiss. and No ssp. montanum Akgul and Ketenoglu (Lamiaceae) were examined to comprehend the important characteristics for systematic purposes. Two main types of glandular tichomes were described. These are capitate (type I) and peltate glandular (type II) trichomes. The capitate trichomes are subdivided into four subtypes as a subtype IA, subtype IB, subtype IC and subtype ID. Generally, these trichomes consist of one or two-celled head and one or two-celled stalk. Peltate trichomes have eight-celled head in a single circle. Subtype IA and peltate trichomes are seen abundantly on all organs of the species. While subtype IB and subtype IC are rare on the same organs, subtype ID is densely distributed on the leaf, petiole and calyx. (C) 2017 Friends Science Publishers