Guatteria pachyphylla Maas & Westra

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), Blumea 60 (1), pp. 1-219 : 125-126

114. Guatteria pachyphylla Maas & Westra — Map 25

Guatteria pachyphylla Maas & Westra (2010) 269, f. 8. — Type: Vásquez et al. 465 (holo MO;iso NY,U), Peru, Loreto,Prov.Maynas, Puerto Almendras, Río Nanay, above Iquitos , 120 m, 22 Aug. 1980.

Tree 10–24 m tall, diam not recorded; young twigs glabrous. Leaves: petiole 6–15 mm long, 1–3 mm diam; lamina narrowly obovate, 10–21 by 3–7 cm (leaf index 2.4–3.3), coriaceous, not verruculose, brown above and below, glabrous on both sides, base attenuate, basal margins slightly revolute, apex shortly and bluntly acuminate (acumen 1–4 mm long) or obtuse, primary vein impressed above, sharply keeled below, secondary veins indistinct, 12–15 on either side of primary vein, flat to slightly impressed above, smallest distance between loops and margin 3–4 mm, tertiary veins flat to impressed above, reticulate. Flowers in 1– 2-flowered inflorescences in axils of leaves or on leafless branchlets; pedicels 15–20 mm long, c. 1 mm diam, fruiting pedicels 20–25 mm long, c. 2 mm diam, glabrous, articulated at 0.1–0.2 from the base, bracts 5–7, soon falling, up- permost bracts c. 3 by 2 mm; flower buds broadly ovoid; sepals basally connate, shallowly ovate-triangular, 4–5 by 6–7 mm, spreading, but apically reflexed, outer side glabrous, but apex densely covered with curly hairs; petals white or yellow in vivo, narrowly oblong-elliptic, 11–20 by 4–6 mm, outer side rather densely to sparsely covered with crisped, erect hairs; stamens c. 1 mm long, connective shield glabrous. Monocarps 10– 25, colour in vivo not recorded, black in sicco, narrowly ellipsoid, 12–16 by 4–6 mm, glabrous, apex distinctly pointed (apiculum c. 1 mm long), wall c. 0.2 mm thick, stipes 4–8 by 1 mm. Seed narrowly ellipsoid, 12–14 by 4–6 mm, shiny black, rugulose, longitudinally grooved, raphe not distinct from rest of seed.

Distribution — Amazonian Venezuela (Amazonas), Peru (Loreto).

Habitat & Ecology — In non-inundated or periodically inun- dated forest, on clayey to sandy soil.At elevations of up to 120 m. Flowering: August, September; fruiting: January.

Vernacular names — Not recorded.

Note — Guatteria pachyphylla is one of the most distinctive species in Guatteria because of its Clusia -like, coriaceous, narrowly obovate leaves which have a shortly acuminate apex (acumen 1–4 mm long) and impressed tertiary veins. Moreover, the monocarps are distinctly and sharply pointed. It looks superficially similar to the rarely collected Guyanan species G. clusiifolia , sharing most leaf characters, but from that species it differs by much smaller monocarps (12–16 vs c. 22 mm long). Moreover, the monocarps of G. clusiifolia have an obtuse apex and are not sharply pointed as in G. pachyphylla .