137. Guatteria rotundata Maas & Setten — Plate 7a; Map 29 Guatteria rotundata Maas & Setten (1988) 255, f. 11. — Type: Nee & Tyson 10999 (holo MO; iso EAP, H, NY, RB, U, XAL), Panama, Panamá, Chepo, El Llano-Carti road, 16–18.5 km by road N of Pan American Highway, 400–450 m, 28 Mar. 1973. Tree 5–30 m tall, 20–40 cm diam; young twigs sparsely covered with appressed hairs, soon glabrous. Leaves: petiole 2–10 mm long, 1–2 mm diam; lamina obovate to obovate-elliptic, 5–14 by 2–6 cm (leaf index 2–2.8), coriaceous, rather densely to sparsely verruculose on both sides, dull, dark brown above, brown below, glabrous above, rather densely to sparsely covered with appressed hairs below, base acute, extreme base attenuate, decurrent along petiole, apex rounded to obtuse, the extreme tip shortly acuminate (acumen 1–5 mm long) or not protruding, primary vein flat above, keeled below, secondary veins distinct, 7–12 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; flowering and fruiting pedicels 4–15 mm long, 1–2 mm diam, rather densely covered with appressed hairs, articulated at 0.2–0.5 from the base, bracts 4–5, soon falling, not seen; flower buds depressed ovoid; sepals basally connate, broadly ovate-triangular, 3–6 by 4–6 mm, appressed, finally reflexed, outer side rather densely covered with appressed hairs; petals green or yellow in vivo, ovate-elliptic to rhombic, 10–17 by 4–12 mm, outer side rather densely to sparsely covered with appressed or erect and curly hairs; stamens 1–2 mm long, connective shield papillate. Monocarps 10– 25, green in vivo, black in sicco, narrowly ellipsoid, 13–16{–18} by 4–{5–6} mm, glabrous, apex apiculate (apiculum <0.5 mm long), wall c. 0.1 mm thick, stipes 1–4 by c. 1 mm. S eed narrowly ellipsoid, 13–16 by 4–5 mm, pale brown, rugulose. Distribution — Panama. Habitat & Ecology — In forest. At elevations of 0– 500 m. Flowering: February, April, November; fruiting; February. Vernacular names — Not recorded. Note — Guatteria rotundata is unique by its leaves, the apex of which is mostly distinctly rounded.

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 145-147, DOI: 10.3767/000651915X690341, http://zenodo.org/record/16855128