Pollen morphology and the infrageneric classification of Minuartia (Caryophyllaceae)

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Abstract
Pollen size, type and number of apertures, and exine thickness are reported for 25 species representative of all four subgenera of Minuartia (Caryophyllaceae) and of the related genera Honkenya and Wilhelmsia. The pollen of the species of Minuartia subgenus Rhodalsine is trizonocolpate with a relatively thin exine and it differs from that of all other species of the subfamily Alsinoideae. Species of this subfamily apparently all have pollen grains that are pantoporate with a thick exine. The relationship of the species of subgenus Rhodalsine with those of Spergularia (subfamily Paronychioideae), a genus which has pollen grains similar to those of subgenus Rhodalsine, is discussed. A new name, Minuartia webbii McNeill and Bramwell, is proposed.

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