Abstract
Various aspects of the reproductive biology of Petrocoptis grandiflora Rothm. (Caryophyllaceae) were studied. including fruit- and seed-set in response to pollination from different sources, pollen/ovule ratio, floral duration, pollinator spectrum and behaviour (including nectar robbery), and nectar characteristics and production. Fruit-set and seed production were significantly lower in autogamous and geitonogamous crosses. The pollen/ovule index value obtained is consistent with the species' xenogamous character. P. grandiflora is pollinated mainly by long-tongued bces (Anthophoridae) which characteristically demand a high-sugar nectar. Diurnal patterns of pollinator activity and nectar presentation accord with those described for other species in the Iberian peninsula. Nectar robbery did not affect fruit-set levels.
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