作者: J. Honkanen , P. Ryöppy
DOI: 10.1007/978-3-642-73614-8_27
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摘要: The clovers (Trifolium spp.) belong to the family Leguminoseae. There are some 300 species within genus, distributed all over world, but mostly in northern temperate and subtropical zones. They grown for hay, pasture or soil improvement, usually mixtures with grasses except when intended seed production. Species numerous sections subsections between which hybrid barriers very strong (Taylor 1980). Very few natural hybrids known, although can be hybridized by applying embryo rescue technique (Merker 1984).