Evolution of Funnel-Revolver Flowers and Ornithophily in Nasa (Loasaceae)
- 1 January 2006
- journal article
- Published by Wiley in Plant Biology
- Vol. 8 (1), 120-142
- https://doi.org/10.1055/s-2005-873034
Abstract
Floral morphology, distribution, and flower visitors for 60 taxa of Nasa are investigated and compared to molecular trees inferred both from a combined marker analysis (ITS1 and trnLUAA) and from a single marker (ITS1). Flowers conform to two different floral types: Firstly, “tilt-revolver flowers”, with spreading to reflexed, white to yellow petals and small, brightly coloured floral scales contrasting with the petals and firmly enclosing the nectar (Saccatae and Carunculatae); secondly, “funnel-revolver flowers”, with half-erect to erect, orange to red petals and floral scales not contrasting with the petals, or enclosed in the corolla, and nectar freely accessible by funnel-shaped floral scales (Alatae, Grandiflorae, and N. venezuelensis species group). Phylogenetic analysis shows that “tilt-revolver flowers” represent the plesiomorphic condition by outgroup comparison. The two groups with tilt-revolver flowers in Nasa are not monophyletic (Saccatae are paraphyletic, Carunculatae are polyphyletic). Most Saccatae fall into two monophyletic assemblages, the N. poissoniana species group and the N. triphylla species group. The remainder of Saccatae group either with Grandiflorae (N. insignis species group) or with Alatae (N. laxa species group). The clades retrieved in the molecular analysis contradict the traditional classification, but are congruent with vegetative morphology, details of the flower morphology, and biogeography. “Funnel-revolver flowers” represent the derived condition, but molecular data suggest a convergent development (at least twice independently), since the corresponding species do not constitute a monophyletic group. “Tilt-revolver flowers” are visited and pollinated by bees (especially Colletidae), whereas “funnel-revolver flowers” are mostly visited by hummingbirds. The transition from melittophily to ornithophily may have been the license for the colonization of, and the diversification in, both cloud forest and high Andean habitats.Keywords
This publication has 26 references indexed in Scilit:
- A Phylogenetic Analysis of Loasaceae Subfamily Loasoideae Based on Plastid DNA SequencesInternational Journal of Plant Sciences, 2005
- The seeds of Loasaceae subfam. Loasoideae (Cornales) I: Seed release, seed numbers and fatty acid compositionFlora, 2004
- Homology and Developmental Transformation: Models for the Origins of the Staminodes of Loasaceae Subfamily LoasoideaeInternational Journal of Plant Sciences, 2003
- The major clades of Loasaceae: phylogenetic analysis using the plastid matK and trnL‐trnF regionsAmerican Journal of Botany, 2003
- Santiago wittmanni sp. nov. do Peru e notas sobre Eucerini (Hymenoptera, Anthophoridae)Revista Brasileira de Zoologia, 2003
- Nasa panamensis, a new species of Nasa (Loasaceae) from Central AmericaBotanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie, 2002
- Secondary Structure of the ITS1 Transcript and its Application in a Reconstruction of the Phylogeny of BoraginalesPlant Biology, 2001
- Four New Combinations in the Genus Nasa (Loasaceae)Novon: A Journal for Botanical Nomenclature, 2001
- A revision of the Peruvian species of Nasa ser. Alatae (Loasaceae)Nordic Journal of Botany, 2000
- TESTING SIGNIFICANCE OF INCONGRUENCECladistics, 1994