65. Guatteria flabellata Erkens & Maas — Map 15 Guatteria flabellata Erkens & Maas in Erkens et al. (2008) 484, f. 7, pl. 2. — Type: Maas et al. 6297 (holo U 2 sheets; iso AMAZ, F, K, MO, WIS), Peru, Loreto, Prov. Maynas, Río Momón, 0–5 km above confluence with Río Nanay, 100 m, 15 Nov. 1984. Guatteria sp. A Vásquez (1997) 100. Tree (3–) 5–28 m tall, to 60 cm diam; young twigs sparsely covered with appressed hairs, soon glabrous. Leaves: petiole 8–12(–15) mm long, 3–5 mm diam; lamina narrowly elliptic, 20–38 by 7–16 cm (leaf index 1.6–3.3), coriaceous, not verruculose, dull, brown above and below, glabrous above, sparsely to rather densely covered with appressed, very short hairs below, base cordate to obtuse, apex acuminate (acumen 10– 25(–35) mm long), primary vein impressed above, secondary veins distinct, 14–22 on either side of primary vein, impressed above, smallest distance between loops and margin 3–5 mm, tertiary veins slightly raised above, reticulate. Flowers in 1–3-flowered inflorescences in axils of leaves or on leafless branchlets; flowering and fruiting pedicels 15–25 mm long, 1–2 mm diam, densely to sparsely covered with appressed, brown hairs, articulated at c. 0.2 from the base, bracts 5–7, soon falling, uppermost bract elliptic, 5 –6 mm long, lower bracts broadly elliptic, 1–3 mm long; flower buds depressed ovoid; sepals free, broadly ovate-triangular, 5–9 by 4–7 mm, strongly reflexed, outer side densely covered with appressed, brown hairs; petals green, maturing cream or reddish in vivo, obovate to broadly obovate, 25–40{–50} by 15–25{–40} mm, base distinctly narrowed (unguiculate) and margins rolled outwards, apex often emarginate, outer base densely covered with appressed hairs, middle and apical part sparsely so to glabrous, outer side with distinct, impressed veins; stamens 1–2 mm long, connective shield papillate to hairy. Monocarps 50–75, green, maturing red to black in vivo, black in sicco, ellipsoid, 9–15 by 5–8 mm, sparsely covered with appressed hairs, apex apiculate (apiculum <0.5 mm long), wall 0.2–0.4{–1} mm thick, stipes 8–16 by 0.5–1{–1.5} mm. Seed ellipsoid, 8–14 by 5–7 mm, pale to dark brown, pitted to transversely grooved, raphe raised. Distribution — Amazonian Peru (Loreto), Brazil (Amazonas, Rondônia). Habitat & Ecology — In periodically inundated forest (igapó, restinga baja, tahuampa, várzea), rarely in non-inundated forest. At elevations of 0– 300 m. Flowering: April to December; fruiting: March to November. Vernacular names — Peru: Anona (Rimachi Y. 6713), Anonilla (Vásquez & Jaramillo 7998), Anonilla-carahuasca (Vásquez & Jaramillo 9690), Baracaspi (Rimachi Y. 1864, 6454), Carahuasca (Rimachi Y. 3437, J. Ruíz & Jaramillo 1134, Vásquez & Jaramillo 9434), Carahuasca blanca (J. Ruíz 1078), Carahuasca de bajial, Carahuasca de hoja ancha. Note — Guatteria flabellata is recognizable by petals which are very well marked by a distinct impressed venation on their outer side; furthermore the petals are distinctly narrowed towards the base (almost clawed), whereas the apex is often somewhat emarginate.

Published as part of Maas, P. J. M., Westra, L. Y. T., Guerrero, S. Arias, Lobão, A. Q., Scharf, U., Zamora, N. A. & Erkens, R. H. J., 2015, Confronting a morphological nightmare: revision of the Neotropical genus Guatteria (Annonaceae), pp. 1-219 in Blumea 60 (1) on pages 83-85, DOI: 10.3767/000651915X690341, http://zenodo.org/record/16855128