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a basically palmate leaf in which the petiole extends into the lamina as a well-defined 'axis', the costa, which effectively divides the lamina in two (specialist term in Palmae)
sulgsõrmjas leht . Botaanika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//bot/sulgs%C3%B5rmjas%20leht/1/est (27.07.2026)