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The micropylar region of Geranium carolinianum: (A) dark-brown and (B) light-brown impermeable seeds with no colour change in the area adjacent to the micropyle; (C) dark-brown and (D) light-brown permeable seeds with colour change in the area adjacent to the micropyle after dry heat treatment at 80 °C for 1 week. Abbreviations: Hi, hilum; Wg, water gap; Mi, micropyle.
