Nectar: Its Production and Functions in Trumpet Creeper

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Science  25 Jul 1975:
Vol. 189, Issue 4199, pp. 289-291
DOI: 10.1126/science.189.4199.289


Studies of the trumpet creeper, Campsis radicans (L.) Seem. (Bignoniaceae), reveal five distinct nectary systems, a phenomenon never before reported among temperate zone plants. Ant activity, centered around the four extrafloral systems, clearly demonstrates the ant-guard symbiosis usually associated only with tropical or subtropical species. Floral nectar, an attractant for hummingbird and bumblebee pollinators, differs chemically from the ant-attracting nectar produced extraflorally.