Taxon Details: Miconia impressa (Urb.) Judd, Bécquer & Majure
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Narratives:
Family:
Melastomataceae (Magnoliophyta)
Melastomataceae (Magnoliophyta)
Scientific Name:
Miconia impressa (Urb.) Judd, Bécquer & Majure
Miconia impressa (Urb.) Judd, Bécquer & Majure
Primary Citation:
Taxonomic studies in the Miconieae (Melastomataceae). XII. Revision of Miconia sect. Miconiastrum, with emphasis on the Miconia bicolor complex
J. Bot. Res. Inst. Texas 8: 457--491. 2014
Taxonomic studies in the Miconieae (Melastomataceae). XII. Revision of Miconia sect. Miconiastrum, with emphasis on the Miconia bicolor complex
J. Bot. Res. Inst. Texas 8: 457--491. 2014
Accepted Name:
This name is currently accepted.
This name is currently accepted.
Synonyms:
Tetrazygia impressa Urb.
Tetrazygia versicolor Urb.
Tetrazygia minor Urb.
Tetrazygia lanceolata subsp. minor (Urb.) Borhidi
Tetrazygia impressa Urb.
Tetrazygia versicolor Urb.
Tetrazygia minor Urb.
Tetrazygia lanceolata subsp. minor (Urb.) Borhidi
Description:
Description Author and Date: Walter S. Judd, Eldis R. Bécquer Granados, James D. Skean Jr., and Lucas C. Majure modified from "Taxonomic studies in the Miconieae (Melastomataceae). XII. Revision of Miconia sect. Miconiastrum, with emphasis on the Miconia bicolor complex". Judd, Walter S., Bécquer Granados, Eldis R., Skean, James D., Jr., Majure, Lucas C.; J. Bot. Res. Inst. Texas. 8 (2): 457-491. 2014
Type: CUBA. Prov. Pinar del Río: Sierra de los Órganos, Grupo del Rosario, Sierra de Pendejeral, on top of the ridge, 14 Sep 1923, fl, fr, E. L. Ekman 17539 (LECTOTYPE: S!, designated by Walter S. Judd, Eldis R. Bécquer Granados, James D. Skean Jr., and Lucas C. Majure, 2014, because specimen at B destroyed; ISOLECTOTYPE: NY!, fragment).
Description: Evergreen shrub up to ca. 3 m. Young stems terete to slightly quadrangular, the indumentum of dense, matted, pale ferrugineous, stellate to dendritic hairs, becoming only sparse with age, without elongate, multicellular, non-glandular hairs, internodes 0.5–4.2 cm long, lacking longitudinal ridges, nodal line absent or present, faint. Leaves isophyllous or nearly so; petiole 0.7–3.7 cm long, the indumentum of dense, stellate to dendritic hairs; the blade 2.1–9.7 × 0.8–3.6 cm, ovate to elliptic, not falcate, chartaceous to thinly coriaceous, the apex acute to acuminate, the base obtuse to rounded or slightly cordate, the margin plane to slightly revolute, entire; secondary veins in two pairs, one pair conspicuous and one pair inconspicuous, acrodromous, basal, the innermost pair joining midvein at base to 1.5 mm above the leaf base, the conspicuous secondary veins placed 1.3–6 mm in from margin, the inconspicuous secondary veins intramarginal to 1 mm in from margin, tertiary veins percurrent, oriented subperpendicular to midvein, 1–5.5 mm apart, connected by a single quaternary vein, or quaternary veins reticulate, not connecting tertiary veins, the higher order veins reticulate, the midvein and major secondary veins moderately to slightly impressed (occasionally flat), tertiary veins slightly impressed to flat, remaining veins flat on adaxial surface; the midvein strongly raised, the major secondary veins moderately to slightly raised, the minor secondary veins and tertiary veins slightly raised to flat, and the higher order veins flat on abaxial surface; adaxial surface appearing slightly wrinkled after drying, with scattered druse crystals, and drying darker than the abaxial surface, the indumentum initially of dense, white to very pale ferrugineous, globular stellate to stellate hairs, but very quickly glabrescent, although sometimes a few hairs remaining on proximal portion of midvein; abaxial surface pale green, the surface smooth to very slightly bullate, with ± dense, white to very pale ferrugineous, stellate hairs, usually 0.12–0.24 mm across, the veins with dense, similar hairs, such hairs on lamina and veins persistent to rarely somewhat deciduous; mite domatia usually present at junction of midvein and major secondary veins, at least on some leaves of each shoot, but sometimes such domatia absent, when present well to poorly developed, composed of elongate, multicellular, eglandular, pale yellow to ferrugineous, barbate hairs, 0.2–1 mm long. Inflorescences terminal, paniculate cymes, 4–8.5 cm long, 2.5–4.5 cm across, with 2–4 major branch pairs, the peduncle 1–5 cm long, the ultimate axes (pseudopedicels) 1–4 mm long, and the numerous flowers well separated from each other; bracts quickly deciduous, not seen, probably ± triangular; bracteoles 0.5–1.2 × 0.15–0.2 mm, narrowly triangular, with acute apex, deciduous. Flowers 5-merous, zygomorphic (due to positioning of the stamens), with pedicel 0.5–1.5 mm long. Hypanthium 5–6 mm long, terete and not to only slightly constricted above ovary, the free portion 2.5–2.7 mm long, 1.5–2.5 mm wide at the torus, the outer surface with ± dense stellate hairs, the internal surface smooth to very slightly longitudinally ridged, glabrous. Calyx lobes 5, fused in bud as a conical calyptra, but with a minute, apical opening, the tube 1.4–1.6 mm long, consistently and usually regularly tearing, with calyptra-like remnants consisting of 2 or 3 lobes, occasionally tearing more regularly between lobes, and at anthesis the tube thus appearing only ca. 0.5 mm long, with moderate to dense stellate hairs abaxially, and sparse to moderate branched to stellate hairs adaxially, the lobes 0.3–0.6 × 0.15–0.5 mm, ± triangular (but actual calyx lobes not evident at anthesis, appearing as a small apiculum at apex of torn, irregular to ± triangular pseudo-lobes), the apex acute, with hairs similar to those of the tube, green; calyx teeth present, 0.1–0.2 mm long, represented merely by an ellipsoidal bump, nearly filling each of the reduced calyx lobes, green, with rounded apex, and hairs similar to those of calyx. Petals 5, 4.5–6 × ca. 3.5–4.2 mm [but possibly larger, as values based on slightly immature flower and original description], asymmetrically obovate, spreading to reflexed, white, glabrous but both surfaces densely papillose-granulate, the apex rounded, slightly notched, the base slightly narrowed to a broad attachment, the margin entire. Stamens 10, isomorphic, ± geniculate near filament apex; staminal filament 3.5–6 mm long [measurements based on slightly immature flower and original description], glabrous, white, anther thecae 4.5–6 × 0.8–1 mm, subulate, straight to slightly incurved, opening by a small dorso-apical pore, yellow, the connective not prolonged below the thecae, glabrous, but the filament emerging from slight depression in sterile, minutely dorso-lobed anther base. Ovary 3-locular, ca. 3/4 inferior, ± ellipsoid, 2–4.5 mm long, 1.5–2.5 mm in diameter, apically cylindric-conic, glabrous, the apex with small
Phenology: Collected in flower in June, July and September.
Distribution and ecology: Miconia impressa is endemic to Pinar del Río, in western Cuba (Fig. 5), occurring from 500–614 m in thickets over limestone.
Taxonomy and Systematics: Miconia impressa is distinctive, and separable from other species of the M. bicolor complex, because of its flower buds that have a nearly closed (apically), conical calyptra (formed from the calyx tube), so the petals are hidden in bud (although minute, free calyx lobes are still present at the apex of the calyptra). As the flowers mature, the calyx tube usually tears completely and irregularly as a calyptra (of one or two pieces, each formed by fused lobes) or occasionally into more or less regular “lobes,” allowing the petals and stamens to emerge. It is also distinctive in having leaves with a dense, abaxial indumentum of more or less white, stellate hairs (see key). The species is somewhat variable in leaf size, the impression of the veins adaxially, and in the presence, and prominence of mite domatia. Thus, Tetrazygia versicolor and T. minor are here considered within the circumscription of M. impressa.
Description Author and Date: Walter S. Judd, Eldis R. Bécquer Granados, James D. Skean Jr., and Lucas C. Majure modified from "Taxonomic studies in the Miconieae (Melastomataceae). XII. Revision of Miconia sect. Miconiastrum, with emphasis on the Miconia bicolor complex". Judd, Walter S., Bécquer Granados, Eldis R., Skean, James D., Jr., Majure, Lucas C.; J. Bot. Res. Inst. Texas. 8 (2): 457-491. 2014
Type: CUBA. Prov. Pinar del Río: Sierra de los Órganos, Grupo del Rosario, Sierra de Pendejeral, on top of the ridge, 14 Sep 1923, fl, fr, E. L. Ekman 17539 (LECTOTYPE: S!, designated by Walter S. Judd, Eldis R. Bécquer Granados, James D. Skean Jr., and Lucas C. Majure, 2014, because specimen at B destroyed; ISOLECTOTYPE: NY!, fragment).
Description: Evergreen shrub up to ca. 3 m. Young stems terete to slightly quadrangular, the indumentum of dense, matted, pale ferrugineous, stellate to dendritic hairs, becoming only sparse with age, without elongate, multicellular, non-glandular hairs, internodes 0.5–4.2 cm long, lacking longitudinal ridges, nodal line absent or present, faint. Leaves isophyllous or nearly so; petiole 0.7–3.7 cm long, the indumentum of dense, stellate to dendritic hairs; the blade 2.1–9.7 × 0.8–3.6 cm, ovate to elliptic, not falcate, chartaceous to thinly coriaceous, the apex acute to acuminate, the base obtuse to rounded or slightly cordate, the margin plane to slightly revolute, entire; secondary veins in two pairs, one pair conspicuous and one pair inconspicuous, acrodromous, basal, the innermost pair joining midvein at base to 1.5 mm above the leaf base, the conspicuous secondary veins placed 1.3–6 mm in from margin, the inconspicuous secondary veins intramarginal to 1 mm in from margin, tertiary veins percurrent, oriented subperpendicular to midvein, 1–5.5 mm apart, connected by a single quaternary vein, or quaternary veins reticulate, not connecting tertiary veins, the higher order veins reticulate, the midvein and major secondary veins moderately to slightly impressed (occasionally flat), tertiary veins slightly impressed to flat, remaining veins flat on adaxial surface; the midvein strongly raised, the major secondary veins moderately to slightly raised, the minor secondary veins and tertiary veins slightly raised to flat, and the higher order veins flat on abaxial surface; adaxial surface appearing slightly wrinkled after drying, with scattered druse crystals, and drying darker than the abaxial surface, the indumentum initially of dense, white to very pale ferrugineous, globular stellate to stellate hairs, but very quickly glabrescent, although sometimes a few hairs remaining on proximal portion of midvein; abaxial surface pale green, the surface smooth to very slightly bullate, with ± dense, white to very pale ferrugineous, stellate hairs, usually 0.12–0.24 mm across, the veins with dense, similar hairs, such hairs on lamina and veins persistent to rarely somewhat deciduous; mite domatia usually present at junction of midvein and major secondary veins, at least on some leaves of each shoot, but sometimes such domatia absent, when present well to poorly developed, composed of elongate, multicellular, eglandular, pale yellow to ferrugineous, barbate hairs, 0.2–1 mm long. Inflorescences terminal, paniculate cymes, 4–8.5 cm long, 2.5–4.5 cm across, with 2–4 major branch pairs, the peduncle 1–5 cm long, the ultimate axes (pseudopedicels) 1–4 mm long, and the numerous flowers well separated from each other; bracts quickly deciduous, not seen, probably ± triangular; bracteoles 0.5–1.2 × 0.15–0.2 mm, narrowly triangular, with acute apex, deciduous. Flowers 5-merous, zygomorphic (due to positioning of the stamens), with pedicel 0.5–1.5 mm long. Hypanthium 5–6 mm long, terete and not to only slightly constricted above ovary, the free portion 2.5–2.7 mm long, 1.5–2.5 mm wide at the torus, the outer surface with ± dense stellate hairs, the internal surface smooth to very slightly longitudinally ridged, glabrous. Calyx lobes 5, fused in bud as a conical calyptra, but with a minute, apical opening, the tube 1.4–1.6 mm long, consistently and usually regularly tearing, with calyptra-like remnants consisting of 2 or 3 lobes, occasionally tearing more regularly between lobes, and at anthesis the tube thus appearing only ca. 0.5 mm long, with moderate to dense stellate hairs abaxially, and sparse to moderate branched to stellate hairs adaxially, the lobes 0.3–0.6 × 0.15–0.5 mm, ± triangular (but actual calyx lobes not evident at anthesis, appearing as a small apiculum at apex of torn, irregular to ± triangular pseudo-lobes), the apex acute, with hairs similar to those of the tube, green; calyx teeth present, 0.1–0.2 mm long, represented merely by an ellipsoidal bump, nearly filling each of the reduced calyx lobes, green, with rounded apex, and hairs similar to those of calyx. Petals 5, 4.5–6 × ca. 3.5–4.2 mm [but possibly larger, as values based on slightly immature flower and original description], asymmetrically obovate, spreading to reflexed, white, glabrous but both surfaces densely papillose-granulate, the apex rounded, slightly notched, the base slightly narrowed to a broad attachment, the margin entire. Stamens 10, isomorphic, ± geniculate near filament apex; staminal filament 3.5–6 mm long [measurements based on slightly immature flower and original description], glabrous, white, anther thecae 4.5–6 × 0.8–1 mm, subulate, straight to slightly incurved, opening by a small dorso-apical pore, yellow, the connective not prolonged below the thecae, glabrous, but the filament emerging from slight depression in sterile, minutely dorso-lobed anther base. Ovary 3-locular, ca. 3/4 inferior, ± ellipsoid, 2–4.5 mm long, 1.5–2.5 mm in diameter, apically cylindric-conic, glabrous, the apex with small
Phenology: Collected in flower in June, July and September.
Distribution and ecology: Miconia impressa is endemic to Pinar del Río, in western Cuba (Fig. 5), occurring from 500–614 m in thickets over limestone.
Taxonomy and Systematics: Miconia impressa is distinctive, and separable from other species of the M. bicolor complex, because of its flower buds that have a nearly closed (apically), conical calyptra (formed from the calyx tube), so the petals are hidden in bud (although minute, free calyx lobes are still present at the apex of the calyptra). As the flowers mature, the calyx tube usually tears completely and irregularly as a calyptra (of one or two pieces, each formed by fused lobes) or occasionally into more or less regular “lobes,” allowing the petals and stamens to emerge. It is also distinctive in having leaves with a dense, abaxial indumentum of more or less white, stellate hairs (see key). The species is somewhat variable in leaf size, the impression of the veins adaxially, and in the presence, and prominence of mite domatia. Thus, Tetrazygia versicolor and T. minor are here considered within the circumscription of M. impressa.