Billburttia, a new genus of Apiaceae (tribe Apieae) endemic to Madagascar

Anthony Richard Magee, Ben Erik van Wyk, Patricia M. Tilney, Fatima Sales, Ian Hedge, Stephen R. Downie

Research output: Contribution to journalArticle

Abstract

The genus Billburttia is described to include two new species endemic to Madagascar, B. capensoides and B. vaginoides. Both species were tentatively placed within the problematic genus Peucedanum L. (as Peucedanum sp. A and Peucedanum sp. B) based on their dorsally compressed fruits lacking prominent dorsal ribs and with winged marginal ribs. Recently, however, the African members of Peucedanum have been shown to be only distantly related to the type of the genus and have therefore been segregated into six African endemic genera. While the Malagasy species appear superficially similar to members from one of these segregate genera, viz. Notobubon, they differ markedly in their fruit anatomical characters, notably a narrower commissure, six commissural vittae, vascular tissue in the tip of the ribs and sphaerocrystals distributed in and around the epidermis. The latter two characters apparently represent apomorphies for Billburttia. The non-peucedanoid affinity of the genus, as suggested by the fruit anatomical data, was confirmed using ITS and rps16 intron sequences. Both parsimony and Bayesian analyses of these data place Billburttia within the tribe Apieae of subfamily Apioideae and not closely related to either Peucedanum (Selineae) or the African peucedanoid genera (Lefebvrea clade of Tordylieae).

Original languageEnglish (US)
Pages (from-to)237-245
Number of pages9
JournalPlant Systematics and Evolution
Volume283
Issue number3
DOIs
StatePublished - Oct 13 2009

    Fingerprint

Keywords

  • Billburttia capensoides
  • Billburttia vaginoides
  • Fruit anatomy
  • ITS
  • New genus
  • New species
  • Peucedanum
  • Sphaerocrystals
  • rps16 intron

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Plant Science

Cite this