Taxon Details: Pleiochiton setulosum Cogn.
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Narratives:
Family:
Melastomataceae (Magnoliophyta)
Melastomataceae (Magnoliophyta)
Scientific Name:
Pleiochiton setulosum Cogn.
Pleiochiton setulosum Cogn.
Primary Citation:
Fl. Bras. (Martius) 14: 426. 1888
Fl. Bras. (Martius) 14: 426. 1888
Accepted Name:
This name is currently accepted.
This name is currently accepted.
Description:
Description Author and Date: Marcelo Reginato, José Fernando Andrade Baumgratz, and Renato Goldenberg, based on A Taxonomic revision of Pleiochiton (Melastomataceae, Miconieae). Reginato, M., Baumgratz, J.F.A., & Goldenberg, R. Brittonia, 65(1), 2013, pp. 16–41
Type: Brazil. Rio de Janeiro: Rio de Janeiro, “Corcovado a Paineiras”, 22 Aug 1864, A. Glaziou 589 (holotype: BR, high resolution image in UPCB; isotypes: C, P, R,).
Description: Young branches, petioles, and abaxial leaf surface sparsely to moderate covered by eglandular trichomes on acrodromous nerves, more densely so at nodes; inflorescences and hypanthia glabrous or sparsely covered by glandular trichomes, 1–3 mm long, sometimes the glandular trichomes also mixed at branches; older branches and adaxial leaf surface glabrous. Old branches 2.5–3.5 mm diam., nodes 5–8 mm diam. Leaves isophyllous; petioles 4–10 mm long; blade 5–10 x 3–6 cm, ovate to ovate-lanceolate, chartaceous or coriaceous, apex shortly acuminate, rarely obtuse, base rounded or subcordate, margin slightly crenulate and revolute, ciliate (trichomes 2–3 mm long); acrodromous nerves 7 or 5+2, basal or up to 2 mm suprabasal. Cymes 4.5–5.5 cm long, terminal or lateral, lax, 3–5-flowered, 1–4 pairs of paraclades plus an apical triad, rarely just one triad, anthopodia up to 10 mm long; bracts 3.2–9 mm long, cordate, glandulose ciliate, glabrous; bracteoles 2.5–5 mm long, not involucral. Flowers 5-merous, pedicels 0.5–1.5 mm long. Hypanthium 3–4.2 x 3–4 mm, campanulate, torus glabrous. Calyx tube 0.3–0.5 mm long, lobes 0.45–0.65 mm long, deltoid or triangular; external teeth 1.6–2.7 mm long. Petals 4–4.5 x 2.5–3.2 mm, ovate or slightly oblong, apex acute or shortly acuminate. Stamens slightly unequal in size, the shorter filaments 3.4–4 mm long, the longer ones 4–4.5 mm long; anthers yellow, dorsally arcuate, the shorter ones 2.5–3.5 mm long, the longer ones 3.5–4.5 mm long, pore dorsal; connective 0.1–0.6 mm prolonged below the thecae, unappendaged, sometimes with a dorsal lobe. Ovary 1/2 inferior, 2–2.2 x 2–2.3 mm, globose, apex glabrous; style 8–9.5 mm long. Berries ca. 4.5 x 4 mm; seeds 1.1–1.3 x 0.6–0.8 mm, 100–120 per fruit.
Habitat and Distribution: Among the species centered on Rio de Janeiro, P. setulosum shows the widest distribution, reaching Espírito Santo to the north (Fig. 3B). Most of the known specimens were collected at “Macaé de Cima” (Nova Friburgo), and no collection was made in the type-locality since the 19th century. Specimens have been collected in montane forests, from 950 to 1100 m above sea level, growing from 2 to 15 m on the host.
Phenology: Collected with flowers in November, young fruits in November and December, and mature fruits in February and March.
Taxonomy and Systematics: This species can be recognized by the cordate bracts, pedicellate flowers and the globose ovary (the free portion rounded). There is some variation on the size of the leaves and the dorso-basal anther lobes. See comments in P. micranthum.
Description Author and Date: Marcelo Reginato, José Fernando Andrade Baumgratz, and Renato Goldenberg, based on A Taxonomic revision of Pleiochiton (Melastomataceae, Miconieae). Reginato, M., Baumgratz, J.F.A., & Goldenberg, R. Brittonia, 65(1), 2013, pp. 16–41
Type: Brazil. Rio de Janeiro: Rio de Janeiro, “Corcovado a Paineiras”, 22 Aug 1864, A. Glaziou 589 (holotype: BR, high resolution image in UPCB; isotypes: C, P, R,).
Description: Young branches, petioles, and abaxial leaf surface sparsely to moderate covered by eglandular trichomes on acrodromous nerves, more densely so at nodes; inflorescences and hypanthia glabrous or sparsely covered by glandular trichomes, 1–3 mm long, sometimes the glandular trichomes also mixed at branches; older branches and adaxial leaf surface glabrous. Old branches 2.5–3.5 mm diam., nodes 5–8 mm diam. Leaves isophyllous; petioles 4–10 mm long; blade 5–10 x 3–6 cm, ovate to ovate-lanceolate, chartaceous or coriaceous, apex shortly acuminate, rarely obtuse, base rounded or subcordate, margin slightly crenulate and revolute, ciliate (trichomes 2–3 mm long); acrodromous nerves 7 or 5+2, basal or up to 2 mm suprabasal. Cymes 4.5–5.5 cm long, terminal or lateral, lax, 3–5-flowered, 1–4 pairs of paraclades plus an apical triad, rarely just one triad, anthopodia up to 10 mm long; bracts 3.2–9 mm long, cordate, glandulose ciliate, glabrous; bracteoles 2.5–5 mm long, not involucral. Flowers 5-merous, pedicels 0.5–1.5 mm long. Hypanthium 3–4.2 x 3–4 mm, campanulate, torus glabrous. Calyx tube 0.3–0.5 mm long, lobes 0.45–0.65 mm long, deltoid or triangular; external teeth 1.6–2.7 mm long. Petals 4–4.5 x 2.5–3.2 mm, ovate or slightly oblong, apex acute or shortly acuminate. Stamens slightly unequal in size, the shorter filaments 3.4–4 mm long, the longer ones 4–4.5 mm long; anthers yellow, dorsally arcuate, the shorter ones 2.5–3.5 mm long, the longer ones 3.5–4.5 mm long, pore dorsal; connective 0.1–0.6 mm prolonged below the thecae, unappendaged, sometimes with a dorsal lobe. Ovary 1/2 inferior, 2–2.2 x 2–2.3 mm, globose, apex glabrous; style 8–9.5 mm long. Berries ca. 4.5 x 4 mm; seeds 1.1–1.3 x 0.6–0.8 mm, 100–120 per fruit.
Habitat and Distribution: Among the species centered on Rio de Janeiro, P. setulosum shows the widest distribution, reaching Espírito Santo to the north (Fig. 3B). Most of the known specimens were collected at “Macaé de Cima” (Nova Friburgo), and no collection was made in the type-locality since the 19th century. Specimens have been collected in montane forests, from 950 to 1100 m above sea level, growing from 2 to 15 m on the host.
Phenology: Collected with flowers in November, young fruits in November and December, and mature fruits in February and March.
Taxonomy and Systematics: This species can be recognized by the cordate bracts, pedicellate flowers and the globose ovary (the free portion rounded). There is some variation on the size of the leaves and the dorso-basal anther lobes. See comments in P. micranthum.