Trichome micromorphology in Filipendula L.(Rosaceae) from Iran and its taxonomic significance

In the current research, trichome micromorphology of the genus Filipendula from Iran, including seven populations of two species (F. ulmaria and F. vulgaris) and two subspecies (F. ulmaria subsp ulmaria and F. ulmaria subsp. denudata) were examined using Electron Scanning Microscopy (SEM). To do this, primarily, plant samples were collected and identified. Then parts of healthy leaves were selected and washed in a solution of water and detergent. For SEM observation, the dried specimens weremounted on aluminum stubs covered with double-sided cellophane tape and then sputter coated with gold. The result of leaf micromorphological analysis revealed two types of trichome: A) straight appressed-subappressed hairs and b) crispate - floccose or woolly trichome. Based on the current findings leaves of the studied populations are diverse in terms of the hair density and distribution pattern. Straight hairs were observed in leaf adaxial surface of F. ulmaria subsp. ulmaria; leaf margin and midrib of F. ulmaria subsp. denudata and midrib of F. vulgaris. While, dense crispate – floccose hairs were present in the leaf abaxial surface of F. ulmaria subsp.ulmaria; midrib of F. ulmaria subsp. denudata and F. vulgaris F. Indumentum types, their density and distribution have taxonomic value and are useful for inter and intraspecific identification. Based on trichome micromorphology, a key for Iranian species of the genus is provided.

کلیدواژه ها:

Taxonomy ، Micromorphology ، Leaf ، Trichome ، Filipendula ، Rosaceae ، Iran