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Which Lamiales plants produce nectar in a backward-pointing flower spur?

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Within the order Lamiales, several plants feature a corolla base that bears a backward-projecting spur, which serves as the site for nectar production. These include:

  • Kenilworth ivy (Cymbalaria muralis)1
  • Toadflax (Linaria)1
  • Bladderworts (Lentibularia)1
  • Butterworts (Pinguicula)1