translate English to French: Bud exudates of Populus angustifolia and Populus sargentii were qualitatively similar in their flavonoid composition but the exudate of P. angustifolia contained in addition caffeate esters, which were absent from P. sargentii.
Les exudats de bourgeon de Populus angustifolia et de Populus sargentii sont qualitativement similaires dans leur composition en flavonoide mais l'exudat de P. angustifolia contient en plus des esters cafféate, qui sont absent de P. sargentii.