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Percentage frequency distribution of water content (dry mass basis) of embryos isolated from (A–C) dry seeds of O. tomentosa and of those with (D–F) and without (G–I) a valve imbibed on agar for 72 h. Dashed lines indicate the minimal water content required for each group of seeds to germinate. Exhumed seeds were collected in 1998. P = probability that seeds do not reach the minimal water content required for germination. Lower-case letters indicate significant differences.
