Study of morphogenesis of Heliotropium chorassanicum Bung (Heliotropiaceae)

Aim and Background. Heliotropium chorassanicum is an endemic species to Iran which has not been carefully investigated. It is widespread in Kopetdagh area in Khorasan province. In this study anatomical & cytological structure of root, shoot, leaf, flower and its meristem and fruit of above mentioned species has been investigated. Materials and Methods. The samples was collected from Kharasan-e Razavi province and after fixation by FAA fixator, stained by methylgreen & karmen hematoxyline. To understand its structure, pictures have been taken by light microscope. Results. The results show that leaf blade has epiderm with frequent trichomes; cuticule very narrow and thin; mesophyll with chlorophyll, isobillateral in both surfaces, bundle sheath is lanceolate and phloem with 2-6 cell layer; stomata mostly concentrated at hypoderm. Conclusions. With pay attention to identification key and comparition of leaves and trichomes in this species it is conclude that the trichomes are simple with cupshape end and clear cell base. The root has secondary growth.