Foggy tropical hyperdesert geocomplex. 1. Foggy coastal hyperdesert: Eryosice islayensis-Haageocereus australis community. Cacti disperse communities on coastal sandy microdunes “lomas”. 2. Not vegetated coastal hyperdesert. Bare sandy eolic coastal surfaces. 3. Foggy coastal hyperdesert: Tillandsia werdermannii community. Piedmont glacis with sandy eolic cover. 4. Not vegetated interior hyperdesert. Low-montane piedmont glacis and pediments with sandy eolic cover. 5. Flooded woodland and shrubland: Solanum chilense-Tecoma fulva community. Seasonal allochtonous streams riparian desert vegetation. 6. Desert open vegetation: Haageocereus platinospinus-Browningia candelaris community. Rocky soils of low-montane hillside slopes. Graphic geobotanical interpretation based on our field transect data (1993) and cited references.