Miconia pozuzoana L. Cardenas & Michelang. 2014, sp. nov

Autor: Cárdenas, Lizeth A., Burke, Janelle M., Michelangeli, Fabián A.
Rok vydání: 2014
Předmět:
DOI: 10.5281/zenodo.5150983
Popis: Miconia pozuzoana L. Cárdenas & Michelang. sp. nov. (Fig. 3) Treelet with stems acutely angled and sulcate; peduncles quadrangular, fleshy and clearly winged, bracts foliaceous; flowers pedicellate, petals 5–6, pleiostemonous; filaments with a few pedicellate glands; ovary 6-locular, style bending away from the anthers, glabrous; stigma capitate. Type:— PERU. Pasco: Oxapampa, Pozuzo, Sector Huampal, Pan de Azúcar, cerca al área de observación de gallitos de las rocas. 10°11ʹ05ʺS, 75°34ʹ51ʺW, 1000–1100 m, 22 July 2006 (fl), L. Cárdenas & V. Flores 622 (holotype HOXA!, isotypes AMAZ!, CUZ!, HUT!, MOL!, MO!, NY!, USM!). Treelet, up to 2–3.5 m. Young stems acutely angled and sulcate, glabrous, internodes longitudinal ridges absent, nodal line raised and slightly darker than the stem, some internodes hollow and with orifices (presumably for ants). Leaves slightly anisophyllous; petiole 3–4.2 cm long, glabrous; blade 16–24 × 7.5–10 cm, elliptic, coriaceous, base acute to obtuse, apex narrowly acute, occasionally cuneate, margin entire to obscurely undulate; secondary veins 1 pair plus 1 pair of faint marginals, shortly plinerved [diverging Habitat and Distribution:— Miconia pozuzoana is endemic to cloud forests at 1000–1100 m in central Peru where it has been collected four times. Phenology:—Flowering material of Miconia pozuzoana has been collected in July. Etymology:—This new species is named after the district where it grows in the forests of central Peru. Conservation Status:— Miconia pozuzoana is only known only from three populations inside the Yanachaga Chemillen National Park, with an extent of occupancy (EOO) of less than 20 km 2. Based on its restricted distribution and habitat, following IUCN criteria (2001) as implemented in the IUCN guidelines (2011) we recommend that this species is considered Endangered. Additional specimens examined (paratypes):— PERU. Pasco: Oxapampa, Pozuzo, sector Yulitunqui, 10˚16’44’’ S, 75˚31’37” W, 1700 m (fl, fr) 18 Nov 2008, J. R . Ayerbe & D. Heredia 204 (MO, HOXA, USM!); Oxapampa, Pozuzo, Sector Huampal, cercano al puesto de control y la parcela controlada, 10˚11’14” S, 75˚34’49” W, 16 Jul 2008 (fl), L . Cárdenas & V. Flores 523 (AMAZ!, CUZ!, HOXA!, HUT!, MO!, MOL!, USM!); Parque Nacional Yanachaga Chemillén, Carretera Chontabamba al puesto de vigilancia Huampal, 10˚11’ S, 75˚34’ W, 1150 m, 19 Sep 2002 (fr), A . Monteagudo, C. Mateo, G. Ortiz 3890 (MO, USM!). Discussion:— Miconia pozuzoana is morphologically similar to a group of species found at mid-elevation forests throughout the Andes with hollow stems, relatively large flowers (hypanthia of at least 3.5 mm), obovate anthers that open by a minute pore (in some species the apex of the anther is tapering), capitate stigma, and glabrous to glabrescent leaves: M. bailloniana Macbride (1941: 388), M. expansa Gleason (1936: 536), M. huanucensis Wurdack (1972: 201), M. flacida Gleason (1931: 226), and M. hospitalis Wurdack (1972: 475). Based on anther morphology the first three species have been assigned to Miconia section Amblyarrhena and the latter two to Miconia section Tamonea (Aublet 1775: 441) Cogniaux (1886: 238), but because most sections of Miconia are not monophyletic, it is likely that all of these species are closely related based on the character combination mentioned above. Miconia pozuzoana can be easily distinguished by the inflorescences with at least some persistent bracteoles (vs. caducous in all the above species), and the combination of six-merous and pleiostemonous flowers. Among the species mentioned above, only M. huanucensis has some six-merous flowers (although they are mostly five-merous) and M. flaccida may be diplostemonous or pleiostemonous. The winged inflorescences of M. pozuzoana are similar to those of M. flaccida and M. bailloniana. However, hypanthia and fruit are also winged in M. bailloniana and some branches of M. flaccida, while they are always terete in M. pozuzoana. Additionally, M. pozuzoana may also be related to Conostegia inusitata Wurdack (1968: 170) and a closely related undescribed species (see Schnell 1996). Conostegia inusitata has been placed in Conostegia due to the presence of flowers with calyptrate calyx and numerous stamens (Wurdack 1968), however calyx morphology and anther shape differs from that of Conostegia sensu stricto, which led to Schnell (1996) to propose a new genus to accommodate these two species, Florbella, which is not yet validly published. Recent detailed analyses of seed and flower morphology, as well as molecular data show that Conostegia inusitata is not closely related to the other members of Conostegia, and rather it is placed within a large group of Andean Miconia with large flowers (R. Kriebel pers. comm.) and these two species also have quadrangular hollow stems (Michelangeli 2010).
Published as part of Cárdenas, Lizeth A., Burke, Janelle M. & Michelangeli, Fabián A., 2014, Five new species of Miconia (Melastomataceae) from the Central Peruvian Andes, pp. 121-134 in Phytotaxa 188 (3) on pages 126-128, DOI: 10.11646/phytotaxa.188.3.1, http://zenodo.org/record/5147229
{"references":["Macbride, J. F. (1941) Melastomataceae. In: Flora of Peru. Field Museum Publications in Botany 13: 249 - 523.","Gleason, H. A. (1936) Seven American Melastomes. Bulletin of the Torrey Botanical Club 63: 533 - 537. http: // dx. doi. org / 10.2307 / 2480934","Gleason, H. A. (1931) Studies on the flora of northern South America-XV. Recent collections of Melastomataceae from Peru and Amazonian Brazil. Bulletin of the Torrey Botanical Club 58: 215 - 262. http: // dx. doi. org / 10.2307 / 2480704","Wurdack, J. J. (1968) Certamen Melastomataceis XII. Phytologia 16: 169 - 183.","Schnell, C. E. (1996) The genus Conostegia (Melastomataceae). Ph. D. Thesis. Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA, 382 pp.","Michelangeli, F. A. (2010) An annotated list and key of neotropical myrmecophilous Melastomataceae. Proceedings of the California Academy of Sciences 61: 407 - 447."]}
Databáze: OpenAIRE
Externí odkaz: