Taxon Details: Miconia tetragonoloba (Cogn.) Judd, Bécquer & Majure
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Narratives:
Family:
Melastomataceae (Magnoliophyta)
Melastomataceae (Magnoliophyta)
Scientific Name:
Miconia tetragonoloba (Cogn.) Judd, Bécquer & Majure
Miconia tetragonoloba (Cogn.) Judd, Bécquer & Majure
Primary Citation:
Taxonomic studies in the Miconieae (Melastomataceae). XI. A revision of Miconia sect. Calycopteris on Hispaniola
Brittonia 66: 216--249. 2014
Taxonomic studies in the Miconieae (Melastomataceae). XI. A revision of Miconia sect. Calycopteris on Hispaniola
Brittonia 66: 216--249. 2014
Accepted Name:
This name is currently accepted.
This name is currently accepted.
Description:
Description Author and Date: Walter S. Judd, Eldis R. Bécquer & Lucas C. Majure modified from "Taxonomic studies in the Miconieae (Melastomataceae). XI. A revision of Miconia sect. Calycopteris on Hispaniola". Judd, W.S., Bécquer, E.R. & Majure, L.C.; Brittonia 66(3): 224. 2014
Type: Dominican Republic. [Prov. Barahona:] prope Barahona in montibus [or Bergwalder, on some labels], 450 m, 15 Sep 1910 (fl, fr), M. Fuertes 354 (holotype: BR, on-line image seen #5630219; isotypes: A, BR, on-line image seen #5630547, F, 2 sheets, GH, GOET, K, on-line image seen #536906, M, on-line image seen #165405, MIN, NY, fragment of isotype once at B, S).
Description: Shrub to 2 m tall. Young stems terete, the indumentum of dense, ferruginous, globularstellate hairs, 0.06–0.15 mm across, along with ± sparse elongate, eglandular hairs, 0.3– 1.3 mm long, these smooth to roughened, i.e., with minute projections, internodes 0.3–13 cm long, nodal line absent. Leaves often slightly to moderately anisophyllous, i.e., large leaf/small leaf quotient 1–5.7, and vigorous vegetative branches with much larger leaves than reproductive branches; petiole 0.15–2.6 cm long (to 5.5 cm in leaves of vigorous vegetative branches), the indumentum dense, globular-stellate hairs, and sometimes also with a few elongate, eglandular hairs; the blade 0.6–8.1 × 0.5–5 cm (but to 10.3 cm long and 7 cm wide on leaves of vigorous branches), ovate to elliptic or slightly obovate, or orbicular, thinly coriaceous, the apex (acute-) obtuse to rounded, the base subcordate to cordate, the margin plane to slightly revolute, dentate to serrate, often obscurely so, the largest teeth 0.05–0.2 mm (to 0.7 mm on leaves of vigorous vegetative shoots); secondary veins 2 or 3 pairs, 2 conspicuous and 1 inconspicuous, or 1 conspicuous and 1 inconspicuous, acrodromous, ± basal, the innermost pair joining midvein at leaf base or up to 4 mm above base, the innermost conspicuous secondary veins placed 0.5–9.5 mm from margin (but to 15 mm in leaves of vigorous branches), the inconspicuous secondary veins intramarginal (or ending near leaf base) to 1.5 mm from margin, tertiary veins percurrent, oriented subperpendicular to midvein, 0.7– 8.5 mm apart (but to 13 mm apart in leaves of vigorous branches), connected by 1–3 quaternary veins, the higher order veins visible and reticulate, areoles visible, rectangular to polygonal, the midvein and major secondary veins slightly impressed adaxially, tertiary veins flat, visible to obscure adaxially, remaining veins flat and obscure on adaxial surface, the midvein conspicuously raised abaxiallyl, the major secondary veins strongly to slightly raised abaxially, the minor secondary veins and tertiary veins slightly raised to flat and visible abaxially, and the higher order veins flat and visible to obscure on abaxial surface; adaxial surface green, shiny when living, appearing smooth to minutely wrinkled after drying, and drying distinctly darker than the abaxial surface, the indumentum initially of sparse globular-stellate and minute- globular hairs, but very quickly glabrescent, and also usually with few to several, smooth-sided, elongate, eglandular hairs, these placed in the center of laminar regions bounded by primary, secondary and tertiary veins; abaxial surface pale green, the surface glabrous, the veins with sparse to dense, ± ferruginous, globular-stellate hairs, usually 0.05–0.25 mm across, sometimes also with a few elongate, eglandular hairs, usually with minute-globular hairs on the smallest veins. Inflorescences terminal, but occasionally appearing axillary due to their production on short lateral branches, (and the reproductive shoots usually producing only 1 or 2 leafy nodes before terminating in an inflorescence), delicate, well-developed to reduced cymes of 1–35 flowers, associated with a pair of basal bracts, 0.7–1.5 × 0.2–0.5 mm, narrowly triangular, the inflorescence 0.8– 4.5 cm long, 0.4–8 cm across, with 0–2 major branch pairs, the peduncle nearly absent to 1.5 mm long, but if basal inflorescence branches not developed then to 2 cm, the inflorescence axes terete, with indumentum of sparse to moderate, globular-stellate hairs and occasionally with a few elongate, eglandular hairs, the ultimate axes (pseudopedicels) 0.5– 13 mm long, and flowers usually well separated; bracts 0.7–1.4 × 0.15–0.5 mm, narrowly triangular to ovate, ± persistent; bracteoles 0.4–1 × 0.1–0.3 mm, narrowly triangular to linear, persistent. Flowers 4- merous, slightly zygomorphic, with pedicel 0–3 mm long. Hypanthium 0.95–1.7 mm long, distinctly 4-lobed, ± constricted above ovary, the free portion 0.3–0.55 mm long, 1– 1.4 mm wide at the torus, cylindrical to slightly flaring, the outer surface with sparse to moderate globular-stellate hairs and also usually with a few to several, elongate, multicellular, eglandular hairs, the internal surface smooth, glabrous. Calyx with tube 0.2–0.35 mm long at anthesis, sometimes tearing between the calyx lobes, the 4 lobes 0.75–1.3 × 0.8–1.3 mm, triangular, with scattered globular-stellate hairs abaxially, and a few minute-globular hairs adaxially, green, the apex long-acuminate; calyx teeth arising from along longitudinal midline of the calyx lobes, including the long-acuminate tip, 1.2–1.8 mm long, flattened parallel with the floral radii, thus linear when viewed from above, and narrowly triangular and downcurved when viewed from the side, and 0.45– 0.75 mm across, green, with narrowly acute apex, with scattered globular-stellate hairs. Petals 4, 2.5–3 × 1.3–2 mm, asymmetrically obovate, spreading, white at anthesis, glabrous, the apex shortly acute or acuminate, the margin entire. St
Phenology: Miconia tetragonoloba has been collected in flower from February to September.
Distribution and ecology: Hispaniola (Dominican Republic), Sierra de Bahoruco; moist broadleaved forests over limestone, often in ravines, along streams, or on limestone cliffs; 210–713 m.
Taxonomy and Systematics: Miconia tetragonoloba is geographically limited, occurring only in the Sierra de Bahoruco, and it is quite uniform morphologically. Vegetatively, the species is easily confused with M. hispidula (although quite distinctive in its inflorescence form, see key) but the two also can be distinguished by their leaf margins, i.e., ciliate in M. hispidula, and lacking marginal, elongate, eglandular, multicellular hairs in M. tetragonoloba, and adaxial lamina indumentum, i.e., lacking elongate, multicellular hairs in M. hispidula, and usually with such hairs in M. tetragonoloba. In addition, the calyx teeth are 1.2–1.8 mm long in M. tetragonoloba and 3.1–6 mm long in M. hispidula. The species is considered to be critically endangered due to habitat destruction in its restricted geographical range (Peguero & Jiménez, 2011).
Description Author and Date: Walter S. Judd, Eldis R. Bécquer & Lucas C. Majure modified from "Taxonomic studies in the Miconieae (Melastomataceae). XI. A revision of Miconia sect. Calycopteris on Hispaniola". Judd, W.S., Bécquer, E.R. & Majure, L.C.; Brittonia 66(3): 224. 2014
Type: Dominican Republic. [Prov. Barahona:] prope Barahona in montibus [or Bergwalder, on some labels], 450 m, 15 Sep 1910 (fl, fr), M. Fuertes 354 (holotype: BR, on-line image seen #5630219; isotypes: A, BR, on-line image seen #5630547, F, 2 sheets, GH, GOET, K, on-line image seen #536906, M, on-line image seen #165405, MIN, NY, fragment of isotype once at B, S).
Description: Shrub to 2 m tall. Young stems terete, the indumentum of dense, ferruginous, globularstellate hairs, 0.06–0.15 mm across, along with ± sparse elongate, eglandular hairs, 0.3– 1.3 mm long, these smooth to roughened, i.e., with minute projections, internodes 0.3–13 cm long, nodal line absent. Leaves often slightly to moderately anisophyllous, i.e., large leaf/small leaf quotient 1–5.7, and vigorous vegetative branches with much larger leaves than reproductive branches; petiole 0.15–2.6 cm long (to 5.5 cm in leaves of vigorous vegetative branches), the indumentum dense, globular-stellate hairs, and sometimes also with a few elongate, eglandular hairs; the blade 0.6–8.1 × 0.5–5 cm (but to 10.3 cm long and 7 cm wide on leaves of vigorous branches), ovate to elliptic or slightly obovate, or orbicular, thinly coriaceous, the apex (acute-) obtuse to rounded, the base subcordate to cordate, the margin plane to slightly revolute, dentate to serrate, often obscurely so, the largest teeth 0.05–0.2 mm (to 0.7 mm on leaves of vigorous vegetative shoots); secondary veins 2 or 3 pairs, 2 conspicuous and 1 inconspicuous, or 1 conspicuous and 1 inconspicuous, acrodromous, ± basal, the innermost pair joining midvein at leaf base or up to 4 mm above base, the innermost conspicuous secondary veins placed 0.5–9.5 mm from margin (but to 15 mm in leaves of vigorous branches), the inconspicuous secondary veins intramarginal (or ending near leaf base) to 1.5 mm from margin, tertiary veins percurrent, oriented subperpendicular to midvein, 0.7– 8.5 mm apart (but to 13 mm apart in leaves of vigorous branches), connected by 1–3 quaternary veins, the higher order veins visible and reticulate, areoles visible, rectangular to polygonal, the midvein and major secondary veins slightly impressed adaxially, tertiary veins flat, visible to obscure adaxially, remaining veins flat and obscure on adaxial surface, the midvein conspicuously raised abaxiallyl, the major secondary veins strongly to slightly raised abaxially, the minor secondary veins and tertiary veins slightly raised to flat and visible abaxially, and the higher order veins flat and visible to obscure on abaxial surface; adaxial surface green, shiny when living, appearing smooth to minutely wrinkled after drying, and drying distinctly darker than the abaxial surface, the indumentum initially of sparse globular-stellate and minute- globular hairs, but very quickly glabrescent, and also usually with few to several, smooth-sided, elongate, eglandular hairs, these placed in the center of laminar regions bounded by primary, secondary and tertiary veins; abaxial surface pale green, the surface glabrous, the veins with sparse to dense, ± ferruginous, globular-stellate hairs, usually 0.05–0.25 mm across, sometimes also with a few elongate, eglandular hairs, usually with minute-globular hairs on the smallest veins. Inflorescences terminal, but occasionally appearing axillary due to their production on short lateral branches, (and the reproductive shoots usually producing only 1 or 2 leafy nodes before terminating in an inflorescence), delicate, well-developed to reduced cymes of 1–35 flowers, associated with a pair of basal bracts, 0.7–1.5 × 0.2–0.5 mm, narrowly triangular, the inflorescence 0.8– 4.5 cm long, 0.4–8 cm across, with 0–2 major branch pairs, the peduncle nearly absent to 1.5 mm long, but if basal inflorescence branches not developed then to 2 cm, the inflorescence axes terete, with indumentum of sparse to moderate, globular-stellate hairs and occasionally with a few elongate, eglandular hairs, the ultimate axes (pseudopedicels) 0.5– 13 mm long, and flowers usually well separated; bracts 0.7–1.4 × 0.15–0.5 mm, narrowly triangular to ovate, ± persistent; bracteoles 0.4–1 × 0.1–0.3 mm, narrowly triangular to linear, persistent. Flowers 4- merous, slightly zygomorphic, with pedicel 0–3 mm long. Hypanthium 0.95–1.7 mm long, distinctly 4-lobed, ± constricted above ovary, the free portion 0.3–0.55 mm long, 1– 1.4 mm wide at the torus, cylindrical to slightly flaring, the outer surface with sparse to moderate globular-stellate hairs and also usually with a few to several, elongate, multicellular, eglandular hairs, the internal surface smooth, glabrous. Calyx with tube 0.2–0.35 mm long at anthesis, sometimes tearing between the calyx lobes, the 4 lobes 0.75–1.3 × 0.8–1.3 mm, triangular, with scattered globular-stellate hairs abaxially, and a few minute-globular hairs adaxially, green, the apex long-acuminate; calyx teeth arising from along longitudinal midline of the calyx lobes, including the long-acuminate tip, 1.2–1.8 mm long, flattened parallel with the floral radii, thus linear when viewed from above, and narrowly triangular and downcurved when viewed from the side, and 0.45– 0.75 mm across, green, with narrowly acute apex, with scattered globular-stellate hairs. Petals 4, 2.5–3 × 1.3–2 mm, asymmetrically obovate, spreading, white at anthesis, glabrous, the apex shortly acute or acuminate, the margin entire. St
Phenology: Miconia tetragonoloba has been collected in flower from February to September.
Distribution and ecology: Hispaniola (Dominican Republic), Sierra de Bahoruco; moist broadleaved forests over limestone, often in ravines, along streams, or on limestone cliffs; 210–713 m.
Taxonomy and Systematics: Miconia tetragonoloba is geographically limited, occurring only in the Sierra de Bahoruco, and it is quite uniform morphologically. Vegetatively, the species is easily confused with M. hispidula (although quite distinctive in its inflorescence form, see key) but the two also can be distinguished by their leaf margins, i.e., ciliate in M. hispidula, and lacking marginal, elongate, eglandular, multicellular hairs in M. tetragonoloba, and adaxial lamina indumentum, i.e., lacking elongate, multicellular hairs in M. hispidula, and usually with such hairs in M. tetragonoloba. In addition, the calyx teeth are 1.2–1.8 mm long in M. tetragonoloba and 3.1–6 mm long in M. hispidula. The species is considered to be critically endangered due to habitat destruction in its restricted geographical range (Peguero & Jiménez, 2011).