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Key to Hexasepalum

Rubiaceae

Hexasepalum

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1 Corolla 8-11 mm long, pink or lilac; ventral face of mericarps flat, without depressions, embryo straight, pollen grains only with microspines
1 Corolla 3-7 mm long, white or very pale pink; ventral face of mericarps with two depressions, one on each side of the midline, embryo apically curved, pollen grains with two supratectal elements (spines and small granules)