Материал из Антэкология /// Anthecology
Pollination of Thlaspi alpester by selfing and by insects in the alpine zone of Colorado
One hundred and thirty-eight visits by Phyllotreta albionica (Lec.) (Coleoptera: Chrysomelidae) were observed at the flowers of Thlaspi alpestre L. (Cruciferae) in early June on the Colorado alpine tundra. Forty visits by Formica neorufibarbis gelida Wheeler (Hymenoptera: Formicidae), 8 visits by Quadrularia laetifica (R.-D.) (Diptera: Muscidae) and 12 visits by other insects were recorded. T. alpestre pollen grains, which have a pebbled surface with triradiate sutures, were found on the insect visitors. Fruiting was reduced to 70% in flowers that were covered, while 90% of the uncovered flowers produced fruit. T. alpestre is not agamospermous since flowers lacking stigmas did not set seed.