Miconia vincentiana (Melastomataceae: Miconieae), a curious endemic to St. Vincent, Lesser Antilles

The new combination Miconia vincentiana and a detailed description are provided for the species previously known as Clidemia vincentiana, a member of Miconia sect. Sagraea endemic to the island of St. Vincent in the Lesser Antilles. In addition, the curious supernumerary leaflets often borne on the distal portion of the petiole are described. Such structures have not been recorded from any other species of Miconieae

A vascular flora of the Eckerd College Palm Hammock Nature Area: A dredge and fill site in Pinellas County, Florida

A study of the vascular plants of the Palm Hammock Nature Area, a designated natural area on the west side of the Eckerd College campus in Pinellas County, Florida, was carried out between January 2012 and January 2013. The site is situated entirely on dredged fill soil, rendering it an intriguing site on which to study natural succession. This floristic inventory provides baseline data on the species composition at the site for use in future studies of the Palm Hammock and other forested dredge and fill sites. A total of 157 vascular species were collected from the 4.6 ha site, including 155 angiosperms. Of these, 99 species are native to North America, and 58 species are not native. Of the nonnative species, 20 are considered invasive. The most frequently represented families included Asteraceae (18), Fabaceae (18), Poaceae (14), and Cyperaceae (11). The Palm Hammock Nature Area, which comprises small patches of cabbage palm/oak hammock, cabbage palm stands, and grasslands similar to coastal savannas, shares characteristic species and composition with both maritime and mesic hammocks

MICONIA CORDIERI, A NEW SPECIES OF MICONIA SECT. SAGRAEA (MELASTOMATACEAE) FROM THE MACAYA BIOSPHERE RESERVE, HAITI

Volume: 6Start Page: 37End Page: 4

Taxonomic studies in the miconieae (Melastomataceae). XIV. Species of Miconia section Sagraea that occur in the greater antilles and additionally in the lesser antilles and/or continental regions

The systematics of three species of Miconia sect. Sagraea from the Greater Antilles, which also occur in the Lesser Antilles and/or continental regions, is investigated. These taxa, representing lineages of likely independent dispersal into the Greater Antilles, are here taxonomically revised, including for each a description, nomenclatural information (including a new name, Miconia sciaphila, and two new combinations, M. berteroi and M. septuplinervia), specimen citations, and an eco-geographical characterization. These species are compared with members of two species-rich clades of sect. Sagraea of independent diversification in the Greater Antilles: the Clidemia oligantha/C. leucan-dra complex (comprising seven species) and the Brevicyma clade (29 species). A key to the three species, distinguishing among them and separating them from the two species-rich Greater Antillean clades is provided

Recognition of Miconia sect. Sagraeoides (Melastomataceae: Miconieae) and associated nomenclatural changes

Recent phylogenetic studies incorporating DNA sequence data have corroborated the suspected non-monophyly of many currently recognized genera of tribe Miconieae (Melastomataceae), which includes about 1800 species restricted to the Neotropics. The genus Mecranium, comprising 24 species endemic to the Greater Antilles and their satellite islands, appears to be a monophyletic exception within the tribe. However, the continued recognition of Mecranium as a genus, at best, would render Miconia paraphyletic. The most practical solution to the problem of non-monophyletic circumscription of genera in the Miconieae is the recognition of a broadly defined Miconia, with the taxonomic recognition of its subclades as subgenera and sections. Here the Mecranium clade is recognized as a section within a broadly circumscribed Miconia, all recognized species are listed, and 26 new names and nomenclatural combinations are published. In addition, the section is described, and the phylogenetic relationships of its species are discussed briefly based on molecular and morphological phylogenetic analyses

TETRAZYGIA PARALONGICOLLIS (MICONIEAE: MELASTOMATACEAE), A NEW SPECIES FROM THE SIERRA DE BAORUCO AND SIERRA MARTIN GARCIA, DOMINICAN REPUBLIC

Volume: 2Start Page: 35End Page: 4

Taxonomic and nomenclatural notes on Miconia crenata and related species (Melastomataceae: Miconieae) in the Greater Antilles

The nomenclature and phylogenetic placement of five species of Miconieae in the Greater Antilles with conspicuous multicellular, simple, elongate, eglandular or gland-headed hairs, pseudolateral inflorescences, and flowers with elongated calyx teeth, 5-8, white, rounded petals, white, ovate anthers, and purple-or blue-black fruits are considered. These species have traditionally been considered within the poly-phyletic genus Clidemia, but are here transferred to Miconia sensu lato. Four new combinations are presented, i.e., Miconia dependens (D. Don) Judd & Majure, M. erythropogon (DC.) Judd & Ionta, M. octona (Bonpl.) Judd & Majure, and M. strigillosa (Sw.) Judd & Ionta. Finally, we note that the widespread and economically important species previously known as Clidemia hirta (L.) DC., when considered within Miconia, bears the name Miconia crenata (Vahl) Michelang

Nomenclatural novelties in Miconia (Melastomataceae: Miconieae)

The Miconieae (Melastomaceae) are a strictly Neotropical group comprising over 1900 species. The tribe is characterized by inflorescences that are terminal or axillary, but not cauliflorous (except a few species of Charianthus, Clidemia, and Mecranium), flowers subtended by only one pair of bracteoles (or none at all), with anthers that lack a pedoconnective, leaves without long acicular raphides, and berry fruits. Generic delimitations within the Miconieae have been notoriously complex, and phylogenetic analyses have shown that Miconia is paraphyletic with many other genera embedded within it. These nested genera include Anaectocalyx, Calycogonium, Catocoryne, Charianthus, Clidemia, Conostegia, Killipia, Leandra, Maieta, Mecranium, Necramium, Ossaea, Pachyanthus, Pleiochiton, Sagraea, Tetrazygia, and Tococa. In the absence of a workable solution that allows the subdivision of the tribe into smaller, morphologically recognizable and monophyletic genera, it has been previously proposed that only one genus be recognized in the tribe. Here we present the necessary taxonomic and nomenclatural changes necessary to recognize Miconia as the sole genus within Miconieae

Floral elaiophores in Lockhartia Hook. (Orchidaceae: Oncidiinae): their distribution, diversity and anatomy

Background and Aims: A significant proportion of orchid species assigned to subtribe Oncidiinae produce floral oil as a food reward that attracts specialized bee pollinators. This oil is produced either by glabrous glands (epithelial elaiophores) or by tufts of secretory hairs (trichomal elaiophores). Although the structure of epithelial elaiophores in the Oncidiinae has been well documented, trichomal elaiophores are less common and have not received as much attention. Only trichomal elaiophores occur in the genus Lockhartia, and their distribution and structure are surveyed here for the first time. Methods: Flowers of 16 species of Lockhartia were studied. The location of floral elaiophores was determined histochemically and their anatomical organization and mode of oil secretionwas investigated by means of light microscopy, scanning electron microscopy and transmission electron microscopy. Key Results and Conclusions: All species of Lockhartia investigated have trichomal elaiophores on the adaxial surface of the labellum. Histochemical tests revealed the presence of lipoidal substances within the labellar trichomes. However, the degree of oil production and the distribution of trichomes differed between the three major groups of species found within the genus. All trichomes were unicellular and, in some species, of two distinct sizes, the larger being either capitate or apically branched. The trichomal cuticle was lamellate, and often appeared distended due to the subcuticular accumulation of oil. The labellar trichomes of the three species examined using transmission electron microscopy contained dense, intensely staining cytoplasm with apically located vacuoles. Oil-laden secretory vesicles fused with the plasmalemma and discharged their contents. Oil eventually accumulated between the cell wall and cuticle of the trichome and contained electron-transparent profiles or droplets. This condition is considered unique to Lockhartia among those species of elaiophore-bearing Oncidiinae studied to date.American Orchid Society/[]AOS/Estados UnidosUCR::Vicerrectoría de Docencia::Ciencias Básicas::Facultad de Ciencias::Escuela de Biologí