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Botanical illustration of N. aenigma. (a) stem with leaves; (b) climbing stem with dormant bud; (c) intermediate pitcher; (d) column and outer rim peristome of intermediate pitcher; (e) lid of intermediate pitcher, lower surface; (f) inner edge of intermediate pitcher peristome; (g) upper pitcher; (h) lid of upper pitcher, lower surface; (i) female flowers. Drawing by Eline Nuytemans.
