Distyly and pollen dimorphism in Damnacanthus (Rubiaceae)

@article{Naiki2003DistylyAP,
  title={Distyly and pollen dimorphism in Damnacanthus (Rubiaceae)},
  author={Akiyo Naiki and Hidetoshi Nagamasu},
  journal={Journal of Plant Research},
  year={2003},
  volume={116},
  pages={105-113}
}
We document distyly in Damnacanthus (Rubiaceae) and investigate pollen morphology in the genus. Within nine taxa in Japan (four species, four varieties and one form), five show distyly. Non-distylous taxa of Damnacanthus always have a long style and short stamens. We examined the pollen morphology of all taxa of Damnacanthus in Japan. The pollen grains of Damnacanthus are 3- to 5-orthocolporate or sometimes loxocolporate. Polymorphic pollen is sometimes observed even within a single flower… 
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