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Photos of Rivea ornata from the two study populations. (A) A Rivea ornata plant during the flowering season. (B) A dark purple petiolar nectary at the Mae Hong Son study site surrounded by Camponotus rufoglaucus ants foraging on the droplet of nectar observed in the center of the nectary. (C) A green petiolar nectary at the Sakon Nakhon study site visited by Crematogaster sp. ants foraging on nectar.
