Val Rosandra-Dolina Glinščice is the only place in the Trieste Karst where a surface stream flows. The word 'Karst' is usually synonymous with a rocky surface with no watercourses. The area has a marked asymmetry in vegetation: on one side scree dominates, on the other side woods alternate with vertical walls. On some of the flatter areas, there are heaths and grasses and, near the stream, vegetation typical of wetter areas. The vegetation has bright and seasonal bloomings: in spring yellow dominates, while in autumn it is pink-violet. In the upper part of the Reserve, where the slopes are gentler, the vegetation is more compact and the blooms are less frequent and more regular. Here, green dominates.