Hybrid swarm

A population, usually of an open-pollinated plant, that shows very great genetic diversity because it is derived from a cross between two or more different species . The tea crop is a typical example. See also: cline. Hybrid variety

A cultivar of an open-pollinated species (e.g., maize, cucumber, onion) which has been produced by crossing two inbred lines. The resulting seed then produces plants that exhibit hybrid vigour, or heterosis. A hybrid variety can be used only once, because the hybrid vigour is largely lost in the second generation. This means that the seed of hybrid varieties is expensive, but the expense is more than justified by the increased yields. Hybrid varieties do not normally need the protection of breeders' rights because the breeder has complete control of the inbred lines.

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