TL;DR: The results confirm the preliminary ideas that Blakea and Topobea do not differ enough to enable the creation of these genera on the basis of their wood anatomy, and support Wurdack's suggestion that the Blakeeae are closest to the genera Loreya and Bellucia, and perhaps should be merged with the Miconieae.
Abstract: The present paper deals with the wood anatomy of the Blakeeae (Melastomataceae). Generic descriptions of the secondary xylem of Blakea, Topobea, and Huilaea are given and compared with data on 16 genera of the Miconieae. Numerical pattern detection was undertaken. The results confirm our preliminary ideas that Blakea and Topobea do not differ enough to enable the separation of these genera on the basis of their wood anatomy. Within the Miconieae it is not possible to separate the genera. However, some anatomical differences between the two tribes were found. The genus Huilaea seems to belong in the Blakeeae although it also shows similarities with the Miconieae. Wurdack’s suggestion (pers. comm.) that the Blakeeae are closest to the genera Loreya and Bellucia, and perhaps should be merged with the Miconieae, is supported to some degree.
TL;DR: The 16 species of Melastomataceae restricted to the middle and upper slopes of the Sierra Nevada de Santa Marta, Colombia, are listed and the newly described genus Kirkbridea is placed in the tribe Miconieae.
Abstract: The 16 species of Melastomataceae restricted to the middle and upper slopes of the Sierra Nevada de Santa Marta, Colombia, are listed. Included are seven previously undescribed species:Graffenrieda santamartensis, Miconia insueta, Miconia oreogena, Miconia tricaudata, Huilaea kirkbridei, Kirkbridea tetramera, Kirkbridea pentamera. The newly described genusKirkbridea is placed in the tribe Miconieae.
TL;DR: One new species each is proposed in Chalybea and Huilaea (Melastomataceae: Blakeeae), which are endemic to Peru and Ecuador.
Abstract: One new species each is proposed in Chalybea and Huilaea (Melastomataceae: Blakeeae). Chalybea peruviana has elliptic, 5-plinerved leaves with entire, revolute margins, inflorescences with 33–39 flowers, and is endemic to Peru. Huilaea calyptrata has inflorescences with 15–17, irregularly calyptrate flowers, anthers with a warty connective in the shape of an inverted hand fan, and is endemic to Ecuador. A key to the eight species of Huilaea is provided.
TL;DR: Three phylogenetic analyses using 111 morphological characters resolved the genera of Blakea and Topobea as polyphyletic and demonstrated the phylogenetic utility of these 111 characters, as many are synapomorphic for particular radiations within Blakea.
Abstract: Blakeeae (Melastomataceae) are a Neotropical tribe of mostly hemiepiphytic woody plants that frequently form domatia harboring mites or ants in mutualistic associations. The tribe comprises 10 species in Chalybea and Huilaea and nearly 200 species in Blakea and Topobea. Key characters separating the latter two genera pertain to anther morphology; however, numerous species have been discovered with intermediate anther forms, thus making an already dubious distinction even more doubtful. In order to test the monophyly of Blakea and Topobea, we conducted three phylogenetic analyses using 111 morphological characters, partitioned into qualitative, quantitative, and combined data sets. These analyses resolved the genera as polyphyletic. Blakea has nomenclatural priority; thus, Topobea must be synonymized. Morphological character evolution tracked on the combined cladogram demonstrates the phylogenetic utility of these 111 characters, as many are synapomorphic for particular radiations within Blakea. Noteworthy...
TL;DR: Nectar release in Melastomataceae is apparently related to nectary stomata and not filament slits, which suggests that the acquisition of nectaries is a derived condition.