A plant that grows in cracks, crevices, or fissures of rocks, typically on cliffs or rocky areas.
From Greek 'chasma' (χάσμα, opening/crevice) and 'phyte' (φυτόν, plant). The term was coined by botanists in the 19th century to classify specialized plant habitats. Similar to other '-phyte' terms like 'epiphyte' (tree-dwelling plant) and 'halophyte' (salt-dwelling plant).
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