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Cumulative radicle emergence in seeds of Viburnum betulifolium (A) and Viburnum parvifolium (B) incubated under a temperature sequence beginning at 5 °C or at 25/15 °C. Embryo length and shoot emergence were measured during the temperature sequence beginning at 25/15 °C. Seeds of V. betulifolium and V. parvifolium were collected in 2005. Error bars are ± s.e.
