Pollen grain size of some species of Galium section Platygalium (Rubiaceae) have been studied in diploids (2n = 2× = 22, in G. boreale, G. valantioides, G. broterianum), tetraploids (2n = 4× = 44, in G. boreale), hexaploids (2n = 6× = 66, in G. boreale) and in dodecaploid (2n = 12× = 132, in G. rubioides), and many other ...
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