Tuesday, May 24, 2016

[Botany • 2016] Generic Recircumscription in the Loxocarpinae (Gesneriaceae), As Inferred by Phylogenetic and Morphological Data, with the segregation of Middletonia gen. nov.

Fig. 3. The seven clades of Loxocarpinae.
1, Middletonia C.Puglisi, a new genus including the species with a farinose indumentum on the ovary, segregated from Paraboea (C.B.Clarke) Ridl.; Middletonia multiflora (R.Br.) C.Puglisi. Photos by D.J. Middleton.
2, Dorcoceras Bunge is resur-rected to include the Southeast Asian species with a campanulate corolla previously ascribed to Boea. Left: Dorcoceras sp. nov.; right: D. philippense(C.B.Clarke) Schltr. Photos by P. Karaket.
3, Clade dominated by a paraphyletic Loxocarpus, including the small Malesian genera. 3a, Loxocarpus incanus R.Br. Photo by T. Putthai. 3b, Emarhendia bettiana (M.R.Hend.) Kiew, A.Weber & B.L.Burtt. Photo by J. Tan. 3cOrchadocarpa lilacina Ridl. Photo by T.L. Yao. 3d, Senyumia minutiflora (Ridl.) Kiew, A.Weber & B.L.Burtt. Photo by P.T. Ong. 3e, Spelaeanthus chinii Kiew, A.Weber & B.L.Burtt. Photo by P.T. Ong. 3f, Boea hygroscopica F.Muell. Photo by D.J. Middleton.
4, Clade of three well-defined genera, left unaltered by this study. 4a, Kaisupeea herbacea (C.B.Clarke) B.L.Burtt. Photo by P. Triboun. 4b, Rhabothamnopsis sinensis Hemsl. Photo by M. Möller. 4c, Ornithoboea pseudoflexuosa B.L.Burtt. Photo by P. Karaket.
5, Somrania D.J.Middleton, a small Thai genus, sister to Damrongia Kerr ex Craib. Somrania flavida D.J.Middleton & Triboun. Photo by D.J. Middleton.
6, Damrongia, expanded to include Boea clarkeana Hemsl. and the Asian species of Streptocarpus Lindl. 6a, Damrongia orientalis (Craib) C.Puglisi. Photo by D.J. Middleton. 6b, Damrongia trisepala (Barnett) D.J.Middleton & A.Weber. Photo by P. Triboun. 6cDamrongia clarkeana (Hemsl.) C.Puglisi. Photo by C. Puglisi.
7Paraboea, recircumscribed in this study by the segregation of Middletonia. Paraboea middletonii Triboun. Photo by P. Karaket.  

The Loxocarpinae, also known as the “Boea group”, are the subtribe of Gesneriaceae which includes Boea and a number of segregated genera and close relatives. This group currently comprises over 200 species in 15 genera. Here we present the most up-to-date phylogeny, covering all the genera known to belong to the group, based on Bayesian inference and parsimony of the nuclear ITS and the plastid regions trnL-trnF (intron and spacer) and ndhF-trnL UAG(spacers). The results show discrepancies between the current generic delimitation in the subtribe and the clades delineated by the phylogeny. As a result BoeaDamrongiaParaboea and Streptocarpus are recircumscribed in an attempt to establish a more natural classification and new combinations are made. The new genus Middletonia is described. 

Keywords: BoeaDamrongiaParaboea ; Southeast Asia; Streptocarpus  

  Puglisi, Carmen; Yao, Tze Leong; Milne, Richard; Möller, Michael and Middleton, David J. 2016. Generic Recircumscription in the Loxocarpinae (Gesneriaceae), As Inferred by Phylogenetic and Morphological Data. Taxon. 65(2); 277-292.  DOI:  10.12705/652.5