北海道上川北部地方の雑草誌

Abstract

The weed flora in northern district of Kamikawa, Hokkaido, was surveyed from 1975 to 1979. It consisted of 326 species of 61 families, including the poisonous weeds for domestic animals and the naturalized weeds grown in non-arable lands.These species were classified in the following three groups according to growing places: the upland weeds which are found in and around upland fields (64 annuals and 122 perennials-a total of 186 species of 41 families), the lowland weeds which are found in and around lowland fields (11 annuals and 37 perennials-a total of 48 species of 18 families) and the common weeds which grow both in upland fields and lowland fields (12 annuals and 25 perennials-a total of 37 species of 15 families).Fifty three species of weeds belonging to 27 families were identified as poisonous. These weeds included 9 annuals and 44 perennials, and 24 species of them were found in only non-arable lands.One hundred and three species of the naturalized weeds were found in arable or non-arable lands. They consisted of 39 annuals and 64 perennials, belonging to 23 families, and 64 species among them were growing in upland fields.By their weedy members alone, the following families most plentifully represented are: Comopositae (51), Gramineae (44), Caryophllaceae (20), Labiatae (17), Polygonaceae (17), Cruciferae (13), Ranunculaceae (12), Cyperaceae (12).