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Regel's Threewingnut (Tripterygium regelii), a vigorous, scrambling, deciduous shrub that may be grown as a climber. It is native to Japan, Korea and nearby parts of China and can spread to around 10m wide. The panicles of tiny cream flowers open in early summer and are followed by small, green, three-winged seed capsules. tripterygium-3370htm'>Tripterygium. Celastraceae.