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6. Pterygocalyx Maximowicz, Mém. Acad. Imp. Sci. St.-Pétersbourg Divers Savans. 9: 198. 1859.
翼萼蔓属 yi e man shu
Perennials. Stems twining. Leaves opposite. Flowers 4-merous. Calyx campanulate, tube strongly 4-winged. Corolla tubular, plicae between lobes absent. Stamens inserted on corolla tube. Nectaries at base of ovary, sometimes absent. Capsules 2-valved, many seeded. Seed coat alveolate.
One species: China, Japan, Korea, Russia.
Lower Taxon
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