Composition of the <i>Lecointea</i> clade (Leguminosae, Papilionoideae, Swartzieae), a re­evaluation based on combined evidence from morphology and molecular data

317

Section: Taxon Samplingmentioning

confidence: 99%

“…Cowan, Lecointea Ducke, Uribea Dugand & Romero and Zollernia Wied-Neuw. & Nees (Mansano & al., 2004); (3) Andira Lam. plus Hymenolobium Benth.…”

Section: Papilionoideaementioning

confidence: 99%

Section: Papilionoideaementioning

confidence: 99%

See 1 more Smart Citation

Legume phylogeny and classification in the 21st century: Progress, prospects and lessons for other species–rich clades

Bruneau

Doyle

Herendeen

et al. 2013

317

Morphological analysis and re‐examination of the taxonomic circumscription ofAcosmium(Leguminosae, Papilionoideae, Sophoreae)

Rodrigues

Tozzi

2007

Acosmium Schott is a Neotropical genus of ca. 17 species of trees with non-papilionoid, actinomorphic flowers. It has been included in the genistoid clade (Leguminosae, Papilionoideae) in recent phylogenetic analyses. A morphology-based cladistic analysis was performed to test the currently assumed monophyly of Acosmium, assess the validity of the infrageneric classification of Yakovlev, and detect synapomorphies and other diagnostic characters in Acosmium and related taxa. Thirty-four species representing ten genera of subfamily Papilionoideae were included in the analysis: all accepted species of the four sections of Acosmium together with species of Bowdichia, Clathrotropis, Diplotropis, Bolusanthus, Cadia, Poecilanthe, Cyclolobium, and Ormosia; two species of Luetzelburgia were selected as outgroups. The results do not support the monophyly of Acosmium; the species of this genus fall into three distinct, not closely related clades that correspond to the sections of Acosmium established by Yakovlev except for sect. Mesitis that merges into sect. Leptolobium. We propose: (1) recognizing a narrowly circumscribed genus Acosmium; (2) reinstating the generic name Leptolobium Vogel, encompassing sections Leptolobium and Mesitis; and (3) segregating A. praeclarum (Sandwith) Yakovlev into a new genus, Guianodendron. The phylogenetic relevance of some new or neglected characters, especially from bud architecture, seed, and seedling morphology is emphasized.

The realignment of Acosmium sensu stricto with the Dalbergioid clade (Leguminosae: Papilionoideae) reveals a proneness for independent evolution of radial floral symmetry among earlybranching papilionoid legumes

Cardoso

Lima

Rodrigues

et al. 2012

The genus Acosmium s.l. (Leguminosae: Papilionoideae) traditionally included up to 20 tree species mostly from South America. Due mainly to radial floral symmetry, the taxonomy of Acosmium has been historically confounded with four other Papilionoideae genera: Dicraeopetalum, Guianodendron,Leptolobium, and Sweetia. We used comprehensively sampled molecular data from the nuclear ribosomal internal transcribed spacer (ITS/5.8S) and two plastid DNA (matK, trnL intron) regions in order to evaluate the monophyly of Acosmium s.l. and to shed light on the relationships of its distinct lineages in the context of the Papilionoideae phylogeny. Parsimony and Bayesian analyses of all data concurred in resolving a polyphyletic Acosmium s.l. Our data agreed with previous molecular phylogenetic analyses that resolved Dicraeopetalum and Sweetia apart from Acosmium s.l. Unexpectedly, Acosmium s.str., thought to belong to the Genistoid clade, is here strongly resolved within the Dalbergioid Pterocarpus clade. Despite being classified until recently as different sections of Acosmium s.l., Leptolobium and Guianodendron were resolved within the Genistoid clade as part of a Bowdichia clade with the genera Diplotropis and Bowdichia. Our results reveal that radial floral symmetry has evolved independently in all Acosmium segregates and strongly suggest that the primacy given to floral characters involving corolla symmetry and petal differentiation in traditional legume classification has often obscured phylogenetic relationships.