Figure 1: Corolla and proboscis lengths of seven Nicotiana species and the potential pollinator Manduca sexta.

Grey boxes indicate corolla lengths that significantly differ from the length of the moth proboscis (orange box, dotted line indicates proboscis median length; P<0.05, Kruskal–Wallis test followed by Holm corrected Wilcoxon rank-sum test), while the length of the N. alata corolla (white box) does not differ from the proboscis length (P>0.05). Bar plots next to the flower names indicate absolute differences between corolla length and the moth’s proboscis (cm).