accidental species

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One of five classes of fidelity used by the Braun-Blanquet school of phytosociology in the description and classification of plant communities. Accidentals are rare species in the community, present either as chance invaders from another community or as relicts from a previous community. Compare exclusive species; indifferent species; preferential species; selective species.

Subjects: Plant Sciences and Forestry — Ecology and Conservation.

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