Current address: Naturalis Biodiversity Centre, Section NHN, Leiden University, 2300 RA Leiden, The Netherlands.
Reassessing the taxonomic status of two enigmatic Desmos species (Annonaceae): Morphological and molecular phylogenetic support for a new genus, Wangia
Version of Record online: 8 JAN 2014
© 2013 Institute of Botany, Chinese Academy of Sciences
Journal of Systematics and Evolution
Volume 52, Issue 1, pages 1–15, January 2014
How to Cite
GUO, X., WANG, J., XUE, B., THOMAS, D. C., SU, Y. C. F., TAN, Y.-H. and SAUNDERS, R. M. K. (2014), Reassessing the taxonomic status of two enigmatic Desmos species (Annonaceae): Morphological and molecular phylogenetic support for a new genus, Wangia. Journal of Systematics and Evolution, 52: 1–15. doi: 10.1111/jse.12064
- Issue online: 8 JAN 2014
- Version of Record online: 8 JAN 2014
- Accepted manuscript online: 31 OCT 2013 03:21AM EST
- Manuscript Accepted: 17 OCT 2013
- Manuscript Received: 18 JUL 2013
- Hong Kong Research Grants Council. Grant Number: HKU 7578/05M
- molecular phylogeny;
The systematic position of two enigmatic Annonaceae species from China, Desmos saccopetaloides (W. T. Wang) P. T. Li and Desmos yunnanensis (Hu) P. T. Li, has been controversial, with both species having been transferred between several different genera within subfamilies Annonoideae and Malmeoideae. Phylogenetic analyses of eight chloroplast regions (matK, ndhF, ndhF-rpl32, psbA-trnH, rbcL, rpl32-trnL, trnL-F, and ycf1; ca. 9.2 kb, 66 taxa) unambiguously placed D. saccopetaloides in a subclade of tribe Miliuseae, nested among the genera Monoon, Neo-uvaria, Phaeanthus, Sageraea, and Stelechocarpus. This relationship was also supported by endosperm rumination patterns in the seed; other morphological characters furthermore indicated that D. saccopetaloides has closer affinities with Monoon, Neo-uvaria, and Phaeanthus rather than either Sageraea or Stelechocarpus. Desmos saccopetaloides is distinguished from these genera by its leaf-opposed inflorescences, sepaloid outer petals, saccate inner petals with basal glandular tissue, moniliform monocarps with uniseriate seeds, and rectangular disulculate pollen with two “cryptoapertures.” On the basis of the combined molecular phylogenetic and morphological data, we propose a new genus, Wangia, to accommodate D. saccopetaloides. The molecular phylogenetic analyses furthermore indicated that D. yunnanensis belongs to the genus Dasymaschalon: examination of the type collections revealed that it is conspecific with Dasymaschalon obtusipetalum, although the combination Dasymaschalon yunnanense has nomenclatural priority.