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Common ragweed (Ambrosia artemisiifolia) was found to possess an adaptation enabling the collection of dew and rainfall through stem flow. Stem wells were used to quantitively determine the incidence and extent of dew collection by this mechanism. Stem flow averaged 2.85 ml of dew/plant night during the study, which covered the later portion of the ragweed growing season. Factors influencing dew collection included plant size, stage of phenological development, microhabitats, and the duration of dew exposure. The mechanism may play a vital ecological role in old field plant relationships.
Shure et al. (Sat,) studied this question.