Seed rain has ecological consequences on plant commu- nity structure. This study was conducted in the Monte Austral Neuquino nearby the town of Picun Leufu, Province of Neuquen, Argentina, within an area of 15 km x 15 km (39o 20 32' S; 69o19 30' W). Studies were con- ducted at two sites, distant 1.5 km from one another. Vegetation is distri- buted on the soil surface as vegetation patches. Four superficial locations may be found in the soil of these patches: location 1, small dune accumu- lated under the lee; location 2, found at the edge of the small dune, and below the major grass canopies and tallest shrubs; location 3, located at the edge of the vegetation patch, and location 4 which includes the unco- vered corridors among vegetation patches. Seed rain was measured by collecting seeds from traps located in the four study locations. Our working hypotheses were that (1) seeds of the study species arrive to all locations of the vegetation patches and the nude corridors among patches, and (2) the magnitude of the seed rain depends on time of the year. Larrea divari- cata showed the greatest values in the corridors among vegetation patches and in the periphery of such patches. A similar pattern was found for S. neaei although this species dispersed seeds further from the mother plant. Atriplex lampa distributed seeds homogeneously in all four locations. Elymus erianthus only contributed 1 seed to the seed rain. Larrea divari- cata showed a greater proportion of its total seed rain between December