155. Guatteria stenophylla Maas & Westra, sp. nov. — Fig. 77; Map 34 Species foliis angustissimis apice longe acutis vel acuminatis foliis Xylopiae simulantibus et petalis parvis distincta. — Typus: Mori & Gracie 21842 (holo U; iso INPA, NY), Brazil, Amazonas, Rio Cuieiras, Campina de Jaradá, 23 July 1991. Tree c. 3 m tall, diam not recorded; young twigs rather densely covered with erect, brown hairs to c. 1 mm long, soon glabrous. Leaves: petiole 5–8 mm long, 0.5–1 mm diam; lamina narrowly ovate, 7–11 by 1.5–2.5 cm (leaf index 4.6–5.3), chartaceous, not verruculose, dull, dark brown above, brown below, glabrous above, sparsely covered with some scattered appressed hairs along the primary vein to glabrous below, base acute to obtuse, apex long-acute to acuminate (acumen 10–20 mm long), primary vein flat above, secondary veins distinct, 12–15 on either side of primary vein, raised above, smallest distance between loops and margin 2–3 mm, tertiary veins raised above, reticulate. Flowers solitary in axils of leaves; pedicels 10–19 mm long, 0.5–1 mm diam, rather densely covered with erect, brown hairs to c. 2 mm long, articulated at c. 0.3 from the base, bracts 5 – 6, soon falling or sometimes present to almost flowering stage, the upper ones narrowly ovate-elliptic, to c. 5 mm long; flower buds depressed ovoid; sepals free, broadly ovate-triangular, 4–5 by 3–5 mm, margins reflexed, outer side rather densely covered with appressed to erect, brown hairs to c. 2 mm long; petals green in vivo, elliptic to ovate, 7–11 by 3–5 mm, outer side densely covered with appressed, brown hairs; stamens c. 1 mm long, connective shield papillate. Monocarps and seed not seen. Distribution — Amazonian Brazil (Amazonas). Habitat & Ecology — In campina vegetation.At an elevation of c. 50 m. Flowering: July; fruiting: unknown. Vernacular names — Not recorded. Notes — Guatteria stenophylla, one of the few savanna inhabiting species of the genus, can at first glance be recognized by very narrow and long-tipped leaves and very small petals (up to 11 mm long). Carvalho, Webber et al. 146 (HUAM, U), collected on 25 October 1988 in a sandy campinarana at UHE Balbina, Estrada Cachoeira Morena, Amazonas, Brazil may belong here. This fruiting specimen has the following features: Shrub, c. 2.8 m tall; flowers green; fruiting pedicels c. 15 mm long, 1 mm diam. Monocarps c. 25, green in vivo, black in sicco, ellipsoid, 6–9 by 3–4 mm, glabrous, apex distinctly apiculate (apiculum c. 0.5 mm long), wall 0.1–0.2 mm thick, stipes c. 1 by 1 mm. Seed ellipsoid,6–8 by 3–4 mm, dark brown,deeply pitted.

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 165-169, DOI: 10.3767/000651915X690341, http://zenodo.org/record/16855128