Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Distribution of weed species in agricultural lands of Cheju Island.

Abstract

Distribution, frequency and dominance of weed species in the agricultural lands of Cheju Island were investigated from 1990 to 1996. Weeds distributed on Cheju Island comprised 245 species from 52 families. The most frequently distributed 6 families were Compositae [Asteraceae], Gramineae [Poaceae], Leguminosae [Fabaceae], Polygonaceae, Labiatae [Lamiaceae] and Cruciferae [Brassicaceae], with the number of species for each family being 39, 38, 16, 14, 12 and 10, respectively. These species represented 53% of total weed species. The following weed species had occurrence frequencies of >70%: Stellaria media, Portulaca oleracea, Cerastium holosteoides [C. fontanum] var. hallaisanense, Digitaria violascens, Lamium amplexicaule and Galium spurium on upland fields; S. media and P. oleracea on citrus orchards; and Pterdium aguilunum [P. aquilinum?] var. latiusculum on pastures. Across the entire agricultural lands of Cheju Island, the 5 dominant weeds were: S. media, Cerastium holosteoides var. hallaisanense, Alopecurus aequalis var. amurensis, Erigeron canadensis [Conyza canadensis] and Lamium amplexicaule among winter annuals; P. oleracea, Digitaria sanguinalis, Acalypha australis, Amaranthus lividus and Chenopodium album among summer annuals, and Artemisia princeps, Pinellia ternata, Oxalis corniculata, Calystegia japonica and Paspalum thunbergii among perennials.