Guatteria arenicola Maas & Erkens — Plate
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publication ID |
https://doi.org/10.3767/000651915X690341 |
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persistent identifier |
https://treatment.plazi.org/id/038387AD-FFF5-8547-AE3A-6D629A25FCD6 |
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treatment provided by |
Felipe |
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scientific name |
Guatteria arenicola Maas & Erkens — Plate |
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14. Guatteria arenicola Maas & Erkens — Plate View in CoL 2a, b; Map 5
Guatteria arenicola Maas & Erkens in Erkens et al. (2008) 471, f. 1, pl. 1. — Type: Maas et al. 8980 (holo U; iso NY), Brazil, Acre, km 6 of road from Cruzeiro do Sul to Boa Fé (BR-307), Ramal dos Carobas, c. 200 m, 16 Oct. 2001.
Shrub or tree 2–30 m tall, 5–40 cm diam, trunk fissured, slash orange (in material from Acre); young twigs densely to sparsely covered with appressed hairs, soon glabrous. Leaves: petiole 2–7 mm long, c. 1 mm diam; lamina elliptic to narrowly elliptic, 5–9 by 1–3 cm (leaf index 2–3.6), coriaceous to chartaceous, not verruculose, dull, dark brown, brownish black to greyish black above, somewhat paler brown below, glabrous, except for the hairy primary vein above, rather densely to sparsely covered with appressed hairs below, base attenuate to acute, apex shortly and bluntly acuminate (acumen 1–3 mm long) to rounded, primary vein slightly impressed to flat above, secondary veins indistinct to distinct, 6–13 on either side of primary vein, flat to raised above, smallest distance between loops and margin 2–3 mm, tertiary veins raised above, reticulate. Flowers solitary in axils of leaves; pedicels strongly recurved (in mate- rial from Acre) to erect, 10–13 mm long, c. 1 mm diam, fruiting pedicels 15–20 mm long, c. 2 mm diam, articulated at 0.2–0.5 from the base, bracts 4–5, the 2 upper ones narrowly obovate, 4–6 by 1.5–2 mm, the 3 lower ones 1–1.5 mm long, densely to sparsely covered with appressed hairs; flower buds depressed ovoid, slightly pointed; sepals free or basally connate, broadly ovate-triangular, 3–6 by 3–5 mm, initially appressed, soon spreading and apically reflexed, outer side densely to rather densely covered with appressed hairs; petals green, maturing yellow in vivo, ovate, 5–18 by 3–12 mm, outer side densely covered with appressed to erect hairs; stamens 1–1.5 mm long, connective shield papillate to hairy. Monocarps 10–40, green, maturing black in vivo, brownish black in sicco, ellipsoid, 7–13 by 3–7 mm, sparsely covered with appressed hairs, soon glabrous, apex rounded to bluntly apiculate (apiculum <0.5 mm long), wall 0.3–0.5 mm thick, stipes 0–2 by 1.5–2 mm. Seed ellipsoid, 10–11 by 3–5 mm, pale brown, smooth, raphe not distinct from rest of seed.
Distribution — Amazonian Ecuador (Zamora-Chinchipe), Peru (Cajamarca, San Martín ), Brazil (Acre).
Habitat & Ecology — In campina or campinarana vegetation, or in primary forest, on white, often humous sand.At elevations of 200–2170 m. Flowering: June, September to November; fruiting: May, December.
Vernacular names — Not recorded.
Notes — Guatteria arenicola is a small-leaved species from the white sand campina or campinarana vegetations of Acre, Brazil, and forests on white sands in Peru (San Martín ). It is quite noteworthy by its tiny, prominently veined, coriaceous leaves, its very small flowers, which often have strongly recurved pedicels, and strongly rugose seeds. Another character of this species is the presence of orange slash, a feature not seen so far in any other representative of the genus Guatteria . Guatteria arenicola has been compared with G. rupestris , a species which is known from the cerrados in Minas Gerais, Brazil. They both share some leaf characteristics, but in G. rupestris , the leaves mostly have a rounded to even emarginate apex, whereas the basal margins are revolute.
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