01004nas a2200145 4500008004100000022001400041245004600055210004600101300001400147490000700161520059500168100002200763700002200785856005100807 2017 eng d a0373-296700aGeneric transfers in Malagasy Boraginales0 aGeneric transfers in Malagasy Boraginales a329–3320 v723 a
Recent molecular data have demonstrated convincingly that the Old World genus Hilsenbergia Tausch ex Meisn. (Ehretiaceae) is nested within the New World genus Bourreria P. Browne. Thus, 13 new combinations are required to accommodate the endemic Malagasy species in Bourreria. Additional studies have demonstrated that Heliotropium sect. Orthostachys R. Br. (Heliotropiaceae) is not closely related to the rest of the genus and should be segregated as Euploca Nutt. Three species that occur in Madagascar fall into this group, including one endemic that requires a new combination.
1 aMiller, James, S.1 aGottschling, Marc uhttp://www.bioone.org/doi/10.15553/c2017v722a902585nas a2200265 4500008004100000022001400041245010700055210006900162300001400231490000700245520173400252653003401986653001702020653002802037653002102065653001502086653001802101100002202119700002802141700002202169700002402191700002202215700001602237856006602253 2017 eng d a1365-269900aHistorical biogeography of Boraginales: West Gondwanan vicariance followed by long-distance dispersal?0 aHistorical biogeography of Boraginales West Gondwanan vicariance a158–1690 v443 aAim To examine the historical biogeography of the Boraginales using molecular dating and ancestral area reconstruction. Location World-wide. Methods We constructed data sets that included all major clades of Boraginales and all orders of asterids using previously published sequences of four plastid markers (trnL-trnF, rps16, ndhF, rbcL). We estimated divergence times using a Bayesian uncorrelated, lognormal relaxed clock approach with four different fossil calibration schemes. Ancestral areas were reconstructed using maximum likelihood methods (Dispersal-Extinction-Cladogenesis). Results Boraginales originated during the Early to Late Cretaceous and started its diversification in the Late Cretaceous. The inferred ancestral area of Boraginales includes the Americas and Africa. The two major clades of Boraginales diversified during the Early Paleogene from African and American ancestors respectively. Early branching families in both clades (Codonaceae and Wellstediaceae in one clade and Hydrophyllacee and Namaceae in the other) may have remained restricted to their areas of origin. The other families started diversifying in several regions of the world during the Eocene (Boraginaceae s.str., Heliotropiaceae, Ehretiaceae) or later (Cordiaceae). Main conclusions Molecular dating and ancestral area reconstruction may be broadly consistent with the idea of a vicariant origin of the two major clades of Boraginales after the break-up of West Gondwana, followed by several independent trans-oceanic dispersal events into most areas of the world. However, uncertainty in both divergence times and ancestral area reconstruction do not rule out the possibility of an origin involving long-distance dispersal.
10aAncestral area reconstruction10aBoraginaceae10ahistorical biogeography10aMolecular dating10avicariance10aWest Gondwana1 aLuebert, Federico1 aCouvreur, Thomas, L. P.1 aGottschling, Marc1 aHilger, Hartmut, H.1 aMiller, James, S.1 aWeigend, M. uhttp://onlinelibrary.wiley.com/doi/10.1111/jbi.12841/abstract