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Stipule growth, stem radius, the Young modulus and growth strain remaining along the stem of D. bulbifera. (a) Stipule expansion and stem radius along three twining stems. Stipule size is measured as the distance from the stem to the edge of the stipule (filled circles, stipule; open diamonds, stem radius). (b) Stem Young's modulus versus distance from shoot apex for five stems. (c) Growth strain remaining (see §2) versus distance from apex for 10 circumnutating plants.
