Monographs Details:
Authority:
Luteyn, James L., et al. 1995. Ericaceae, Part II. The Superior-Ovaried Genera (Monotropoideae, Pyroloideae, Rhododendroideae, and Vaccinioideae P.P.). Fl. Neotrop. Monogr. 66: 560. (Published by NYBG Press)
Luteyn, James L., et al. 1995. Ericaceae, Part II. The Superior-Ovaried Genera (Monotropoideae, Pyroloideae, Rhododendroideae, and Vaccinioideae P.P.). Fl. Neotrop. Monogr. 66: 560. (Published by NYBG Press)
Family:
Ericaceae
Ericaceae
Synonyms:
Xolisma apiculata Sleumer
Xolisma apiculata Sleumer
Description:
Species Description - Evergreen, low spreading shrub to moderate-sized tree to ca. 12 m tall with gray, longitudinally furrowed bark; twigs slightly angled, slender, usually densely lepidote, otherwise glabrous; buds ovoid, 1-2 × 0.7-1.4 mm. Leaf blades widely ovate or elliptic to nearly orbicular, 1-2.5(-3.5) × 0.8-2.5(-3) cm, ± flat, coriaceous, ca. 0.29-0.4 mm thick; base cuneate to rounded or slightly cordate; apex acute to truncate (slightly acuminate); margin plane to slightly revolute, apical portion strongly to obscurely and irregularly toothed (nearly entire), basal portion obscurely toothed to entire; venation brochidodromous, 3° veins reticulate; adaxial surface often roughened due to thickened scale bases, lepidote (but scales usually quickly deciduous), sparsely pubescent on basal portion of mid vein, with 2° and 3° veins obscure, not depressed (2° veins slightly depressed); abaxial surface moderately to densely lepidote, otherwise densely pubescent, with all veins raised, forming dense and fine reticulum, often not visible without magnification; scales orange to orange-brown, persistent to less commonly deciduous, 0.12-0.34 mm in diam., usually erose; petiole 1-5 mm long, lepidote, otherwise adaxially pubescent; flower buds ± intermixed with vegetative buds. Inflorescences fasciculate, ca. 4-9-flowered; pedicels clearly articulated with calyx, slender, 2-7 mm long, lepidote, otherwise glabrous to very sparsely pubescent; bracteoles ± opposite, basal, narrowly triangular, 1-1.8 mm long; floral bracts to ca. 2 mm long. Flowers 4-5-merous; calyx lobes triangular, with acuminate apices, 0.8-1.3 × 0.4-0.8 mm, adaxial side sparsely pubescent at margins and near apex, abaxial side lepidote, otherwise glabrous; corolla cylindrical to long-urceolate, white, 3-4.5 × 1.8-2.5 mm, abaxially sparsely lepidote; filaments roughened, 1-2.7 mm long, essentially unappendaged; anthers 0.6-1 mm long; ovary lepidote, otherwise pubescent, placentae ± subapical. Capsules narrowly ovoid, (2.5-)3-4.5 × 1.5-2.5 mm, slightly lepidote, otherwise sparsely pubescent, the pale, very thick sutures separating as unit from adjacent valves; seeds 1.7-2.8 mm long.
Species Description - Evergreen, low spreading shrub to moderate-sized tree to ca. 12 m tall with gray, longitudinally furrowed bark; twigs slightly angled, slender, usually densely lepidote, otherwise glabrous; buds ovoid, 1-2 × 0.7-1.4 mm. Leaf blades widely ovate or elliptic to nearly orbicular, 1-2.5(-3.5) × 0.8-2.5(-3) cm, ± flat, coriaceous, ca. 0.29-0.4 mm thick; base cuneate to rounded or slightly cordate; apex acute to truncate (slightly acuminate); margin plane to slightly revolute, apical portion strongly to obscurely and irregularly toothed (nearly entire), basal portion obscurely toothed to entire; venation brochidodromous, 3° veins reticulate; adaxial surface often roughened due to thickened scale bases, lepidote (but scales usually quickly deciduous), sparsely pubescent on basal portion of mid vein, with 2° and 3° veins obscure, not depressed (2° veins slightly depressed); abaxial surface moderately to densely lepidote, otherwise densely pubescent, with all veins raised, forming dense and fine reticulum, often not visible without magnification; scales orange to orange-brown, persistent to less commonly deciduous, 0.12-0.34 mm in diam., usually erose; petiole 1-5 mm long, lepidote, otherwise adaxially pubescent; flower buds ± intermixed with vegetative buds. Inflorescences fasciculate, ca. 4-9-flowered; pedicels clearly articulated with calyx, slender, 2-7 mm long, lepidote, otherwise glabrous to very sparsely pubescent; bracteoles ± opposite, basal, narrowly triangular, 1-1.8 mm long; floral bracts to ca. 2 mm long. Flowers 4-5-merous; calyx lobes triangular, with acuminate apices, 0.8-1.3 × 0.4-0.8 mm, adaxial side sparsely pubescent at margins and near apex, abaxial side lepidote, otherwise glabrous; corolla cylindrical to long-urceolate, white, 3-4.5 × 1.8-2.5 mm, abaxially sparsely lepidote; filaments roughened, 1-2.7 mm long, essentially unappendaged; anthers 0.6-1 mm long; ovary lepidote, otherwise pubescent, placentae ± subapical. Capsules narrowly ovoid, (2.5-)3-4.5 × 1.5-2.5 mm, slightly lepidote, otherwise sparsely pubescent, the pale, very thick sutures separating as unit from adjacent valves; seeds 1.7-2.8 mm long.
Discussion:
Lyonia microcarpa is closely related to both L. urbaniana and L. tinensis (see above for differences). Lyonia microcarpa is geographically isolated from both of the above taxa (see Figs. 7C & 10A) and is usually elevationally separated from the more distantly related L. truncata var. truncata. In the Sierra de Baoruco, L. microcarpa usually occurs at 1250-2100 m and L. truncata at (400-) 900-1300 m; in the Massif de la Selle, L. microcarpa is found at 1600-2300 m and L. truncata at (600-) 1000-1700(-1800) m.In the Sierra de Baoruco near Aceitillar and in the Massif de la Selle near Morne la Visite, Lyonia microcarpa and L. truncata grow side by side and can be in flower at the same time, but no hybrids between them have been seen. The flowers of L. microcarpa are about half the size of those of L. truncata, and differences in pollinators, along with a slight difference in blooming time, may help to isolate them.
Lyonia microcarpa is closely related to both L. urbaniana and L. tinensis (see above for differences). Lyonia microcarpa is geographically isolated from both of the above taxa (see Figs. 7C & 10A) and is usually elevationally separated from the more distantly related L. truncata var. truncata. In the Sierra de Baoruco, L. microcarpa usually occurs at 1250-2100 m and L. truncata at (400-) 900-1300 m; in the Massif de la Selle, L. microcarpa is found at 1600-2300 m and L. truncata at (600-) 1000-1700(-1800) m.In the Sierra de Baoruco near Aceitillar and in the Massif de la Selle near Morne la Visite, Lyonia microcarpa and L. truncata grow side by side and can be in flower at the same time, but no hybrids between them have been seen. The flowers of L. microcarpa are about half the size of those of L. truncata, and differences in pollinators, along with a slight difference in blooming time, may help to isolate them.
Distribution:
Dominican Republic South America| Haiti South America|
Dominican Republic South America| Haiti South America|