Ogden, J. 1978: Variation in Calystegia R. Br. (Convolvulaceae) in New Zealand. New Zealand Journal of Botany 16: 123–140.
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| Ogden, J. 1978: Variation in Calystegia R. Br. (Convolvulaceae) in New Zealand. New Zealand Journal of Botany 16: 123–140. |