The pollen rain in the Salado Depression (N.E. of Buenos Aires Province) was studied, using the Tauber sampler with monthly changes through 1987. The sampler was set up at a height of 1.5 m and exposed to the vegetation of humid prairies and halophilous steppes withDistichlisspp. Relative frequencies and the absolute number of pollen and spores were calculated. The most abundant pollen grains of herbs are: Iridaceae, Poaceae, Ambrosiinae. Other Asteraceae types, Amaryllidaceae/Alliaceae, Chenopodiaceae/Amaranthoideae and Cyperaceae are less important. The dominant trees are:Celtis tala, Scutia buxifolia, and two cultivated genera,Casuarinaspp., andEucalyptusspp. Mosses are very well represented. The absolute minimum of pollen and spores is found in June, and the maxima in November and February.