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Longitudinal sections of Viburnum betulifolium (A, B) and Viburnum parvifolium (C, D) seeds showing a small linear embryo (A, C) at the time of seed maturity and a fully grown embryo at the time when the seed coat splits (B, D). Endocarp was removed in (B) and (D). Seeds were collected in 2007. Abbreviations: E, embryo; Ec, endocarp; Es, endosperm; SC, seed coat.
