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(b) Aquilegia pubescens

A. pubescens

(normal orientation)

A. formosa

(upright)

A. formosa (normal orientation)

24.11 Hawkmoths Favor Flowers of One Columbine Species

Flowers of Aquilegia formosa are normally pendant (a), while those of A. pubescens are normally upright (b).The plants can interbreed, but the hawkmoths that pollinate A. pubescens distinguish between flowers of the two species, even when A. formosa flowers are experimentally modified to be upright (c).

ductive barriers more rapidly than allopatric pairs of species do. In a study of related sympatric and allopatric species of Drosophila, this was shown to be the case (Figure 24.12).

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