POLLINATOR LIMITATION IN POPULATIONS OF AGALINIS-STRICTIFOLIA (SCROPHULARIACEAE)

Pollinator limitation of percent fruit production and mean seeds/fruit was examined in two populations of Agalinis strictifolia during 1984, 1985, and 1987. Tests for a significant redistribution of resources caused by hand-pollination of a single flower per plant, that could produce a false, positive test for pollinator limitation, were negative. No portion of the flowering season was consistently limited by pollinators. Pollinator limitation in percent fruit production was never detected for either population. Limitation was detected for mean seeds/fruit in one population during one year. Seeds/fruit was limited four out of five times tested during the one flowering season and these periods of time accounted for 60 percent of the total flowers available. Agalinis strictifolia is a hemiparasitic annual and significant reductions in seed production, although rare, could affect future population size and persistence.