Abstract Detail

Characteristics of nectar, nectaries, and nectar spurs

Convergent evolution of nectar spurs across the angiosperms.

From Darwin’s prediction that the long-spurred Angraecum orchid would be associated with a pollinator with a correspondingly long proboscis, nectar spurs have been a classic example of coevolution. Additionally, nectar spurs are also an excellent example of convergent evolution, having evolved repeatedly across the angiosperms—from columbines (Aquilegia), to garden nasturtiums (Tropaeolum), and many more. We examine the diverse nectar spurs in a comparative context, in search of constraints and patterns in these structures. Nectar spurs are defined as a three-dimensional structure associated with a floral nectary. While nectaries have been found on extremely diverse floral (and extrafloral) organs, most nectar spurs originate from petals. We survey the diverse ontogenetic origins, anatomy, and morphology of nectar spurs across the angiosperms, and where possible, make comparisons between their spur-less outgroups. We also locate where shifts in floral symmetry, floral architecture, and floral structure occur. Finally, we highlight current gaps in the literature and future research questions.

1 - University of Florida, 1659 Museum Rd., Gainesville, Florida, 32611, United States

Keywords:
floral evolution
convergent evolution.

Presentation Type: Colloquium Presentations
Session: COL02, Characteristics of nectar, nectaries and nectar spurs
Location: Virtual/Virtual
Date: Monday, July 27th, 2020
Time: 1:00 PM
Number: COL02010
Abstract ID:847
Candidate for Awards:None