Xolisma pseudotinensis Sleumer, Repert. Sp. Nov. 36: 272. 1934.  Lyonia pseudotinensis (Sleumer) Jiménez, Rhodora 62: 237. 1960.  Type.  Dominican Republic.  La Vega: Cordillera Central, Constanza, Gajo de la Angostura, ca. 1300 m, 6 Nov 1929, Ekman H14019b (holotype, S; isotypes, A, GH, LL, n.v., NY).

    Evergreen, usually erect shrub or small tree to 5 meters tall, with grayish, longitudinally furrowed bark; twigs slightly angled, slender, sparsely to densely lepidote, otherwise glabrous to sparsely pubescent; buds ovoid, 1-2 x 0.8-1.3 mm, lepidote.  Leaf blades ovate to elliptic, 1.7-3.5(-4.7) x 0.9-1(-2.8) cm, flat to moderately recurved, coriaceous, ca. 0.32-0.45 mm thick; base cuneate to rounded; apex slightly acuminate to truncate; margin plane to revolute, apical portion strongly to obscurely and irregularly toothed (nearly entire), basal portion strongly toothed to entire; venation brochidodromous, 3o veins ± reticulate; abaxial surface lepidote but scales usually quickly deciduous, moderately to sparsely pubescent on basal portion of midvein, 2o and 3o veins obscure to slightly visible (few 2o depressed); abaxial surface sparsely to moderately lepidote, otherwise densely pubescent, with all veins raised, forming dense and fine reticulum, often not visible without magnification; scales usually light brown, often becoming whitish, persistent, less commonly deciduous, ca. 0.08-0.26 mm in diameter, erose; petiole 2-4.5 mm long, lepidote, otherwise adaxially pubescent; flower buds ± intermixed with vegetative buds.  Inflorescences fasciculate, ca. 3- to 10-flowered; pedicels clearly articulated with calyx, slender, (2.5-)3-7.5 mm long, lepidote, otherwise glabrous; bracteoles ± opposite, basal, narrowly triangular, 1-1.3 mm long; floral bracts to ca. 2 mm long.  Flowers (4-)5-merous; calyx lobes triangular, with acuminate apices, 0.7-1.5 x 0.6-0.9 mm, adaxial side sparsely pubescent at margins and near apex, abaxial side lepidote, otherwise glabrous; corolla cylindrical, white, 4-5 x 2-3 mm, abaxially sparsely lepidote; filaments roughened, 2.5-3 mm long, unappendaged; anthers 0.8-1 mm long; ovary lepidote, otherwise pubescent, placentae subapical.  Capsules usually narrowly ovoid, 3.5-6 x 1.5-3 mm, apex usually slightly constricted, slightly lepidote, otherwise sparsely pubescent, the pale, very thick sutures separating as unit from adjacent valves; seeds 1-2.9 mm long.

    Distribution.  Endemic to the Dominican Republic (Cordillera Central), in low-elevation Pinus occidentalis forests, at ca. 1100-1700 m elev.  Seldom collected in flower but probably blooming chiefly in May.