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Phenological stages of several grasses, shrubs, trees and herbaceous dicots are described at a site typical of rangelands in the Monte Phytogeographical Province (Argentina). High soil water levels determined an extension of tillering during summer in the autumn-winter-spring perennial grasses, and during latespring and summer in the spring-summer perennial grasses. This cautions about strictly classifying these grasses as either cool-or warm-season species. Stem elongation, flowering, fructification and/or seed dispersal in several perennial grasses, and the boot stage, flowering and/or the reproductive stage in some woody species occurred earlier in dryer than in wet springs. However, reproductive phenological phases in other perennial grass and woody species were either advanced or extended later into the season as years became wetter. During wet summers, sprouting can extend even until early …