This paper deals with the distribution, ecology and phytosociology of Moehringia tommasinii March., a stenoendemic species that occurs at the border between Italy and Yugoslavia, near Trieste. A new phytocoenosis of the submediterranean limestone rocks in the North-Adriatic area is described: Asplenio-Moehringietum tommasinii (Centaureo-Campanulion), which is characterized by Asplenium lepidum and Moehringia tommasinii.
