@article {4067, title = {From open areas to forests? The evolutionary history of Philodendron subgenus Meconostigma (Araceae) using morphological data}, year = {2014}, abstract = {

Due to its wide distribution covering three of the largest Neotropical biomes, Philodendron subgenus Meconostigma is an interesting model to discuss the diversification of Neotropical plants. The aim of this study was to test a previous hypothesis that the Eastern and Southern species of P. subg. Meconostigma have plesiomorphic gynoecial structure while in Amazonian species they are apomorphic. To this end, we conducted an analysis of maximum parsimony with generalized frequency coding method using a matrix with 59 morphological characters and 90\% of the species of P. subg. Meconostigma. The phylogenetic reconstruction suggests that the subgenus is monophyletic and originates from open areas of Cerrado. Four morphological synapomorphies support the monophyly of the subgenus and seven synapomorphies support four minor clades within it. Our results also include characterization of three new gynoecial subtypes (A1, A2 and A3) within the subgenus. Subtype A2 (undeveloped stylar body with long stylar canals, absent central stylar dome, shallow compitum) is basal and represents the ancestral gynoecium in the group. These findings suggest that the balance between pollen uptake and accessibility of the locules were decisive to drive gynoecium evolution in the subgenus Meconostigma.

}, keywords = {Character analysis, Floral evolution, Gynoecium, Neotropics, phylogeny}, author = {Calazans, L.S.B. and Sakuragui, C.M. and Mayo, S.J.} } @article {4060, title = {New insights on the phylogenetic relationships among the traditional Philodendron subgenera and the other groups of the Homalomena clade (Araceae)}, year = {2018}, abstract = {

Philodendron (Araceae) is one of the largest Neotropical plant genera, with approximately 500 species and at least 1000 species predicted. There is a considerable ecological diversity in the group, although most species occur in the humid forests of tropical America. Despite being relatively well-studied in taxonomic analyses, the relationships among the traditional morphological groups of the genus are not well-established, mainly regarding the three traditional subgenera, referred here as Philodendron sensu lato (s.l.), P. subg. Pteromischum, P. subg. Philodendron and P. subg. Meconostigma, which was recently recognized as a separate genus, Thaumatophyllum. Therefore, the present work evaluates the phylogenetic position and the monophyly of Philodendron s.l. and its three main subdivisions, and the sister groups within the Homalomena clade, which also includes the Neotropical genus Adelonema, the two Asian genera Homalomena and Furtadoa, and the two African genera Cercestis and Culcasia, by means of molecular phylogenetic approaches including chloroplast DNA (atpFatpH, rpl32-trnL, trnQ-5\′-rps16 and trnV-ndhC) and nuclear (ITS2) markers. The monophyly of Philodendron s.l. and its three lineages is confirmed and our analyses corroborate previous morphologic data indicating Thaumatophyllum as sister to the clade formed by P. subg. Pteromischum and P. subg. Philodendron.

}, keywords = {Adelonema, Aroideae, Homalomena clade, Meconostigma, Pteromischum, Thaumatophyllum}, doi = {doi.org/10.1016/j.ympev.2018.05.017}, author = {Vasconcelos, S. and Soares, M.L.C. and Sakuragui, C.M. and Croat, T.B. and Oliveira, G. and Benko-Iseppon, A.M.} } @article {4059, title = {Recognition of the genus Thaumatophyllum Schott - formerly Philodendron subg. Meconostigma (Araceae) - based on molecular and morphological evidence}, year = {2018}, abstract = {

Philodendron subgenus Meconostigma has been a well-circumscribed group since 1829. Members of this group are easily distinguished by diagnostic morphological characters as well as by a distinct ecology and geographical distribution. Based on molecular, morphological and cytological evidence, we propose the recognition of P. subg. Meconostigma as a distinct genus, Thaumatophyllum Schott. We also present the necessary new combinations, an emended key and some nomenclatural and taxonomic corrections regarding 21 names of Thaumatophyllum.

}, keywords = {chromosomes, molecular phylogeny, morphology, nomenclature, Philodendron, Thaumatophyllum}, doi = {doi: 10.3897/phytokeys.98.25044 }, author = {Sakuragui, C.M. and Calazans, L.S.B. and Loss-Oliveira, L. and Morais, E.B. and Benko-Iseppon, A.M. and Vasconcelos, S. and Schrago, C.G. and Mayo, S.J.} }