Guatteria duckeana R.E.Fr.

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 : 73-75

53. Guatteria duckeana R.E.Fr. — Fig. 34 ; Map 13

Guatteria duckeana R.E.Fr. (1939) 468, f. 22f, g. — Type: Ducke RB 29019 (holo S; iso RB), Brazil,Amazonas, Manaus, Ponte do Mindu (‘loco Ponte de Mindú, ad ripam rivuli’), Nov. 1935.

Tree 6–15 m tall, c. 7.5 cm diam; young twigs densely to rather densely covered with erect hairs, soon glabrous. Leaves: petiole 3–10 mm long, 1–2 mm diam; lamina narrowly elliptic to nar- rowly ovate, 10–22 by 4–6 cm (leaf index 2.5–4), coriaceous, not verruculose, shiny, dark brown above, brown below, rather densely to sparsely covered with erect hairs above, soon glabrous, densely to rather densely covered with erect hairs below (hairs simple, intermixed or not with few bundles of 2 hairs), base acute, obtuse, or attenuate, basal margins mostly revolute, apex acuminate (acumen 5–15 mm long), primary vein flat above, secondary veins indistinct, 8–15 on either side of primary vein, flat above, smallest distance between loops and margin 2–4(–8) mm, tertiary veins flat above, reticulate. Flowers in 1–3-flowered inflorescences in axils of leaves; flowering and fruiting pedicels 5–8 mm long, 1–2 mm diam, densely cov- ered with erect hairs, soon becoming subglabrous, articulated at 0.3–0.6 from the base, bracts c. 5, soon falling, one basal bract seen, broadly elliptic, c. 2 mm long; flower buds depressed ovoid; sepals free, broadly ovate-triangular, 3–5 by 3–5 mm, reflexed, outer side densely covered with appressed hairs, margins revolute; petals green when young in vivo, oblong-elliptic, 8–20 by 5–8 mm, outer side densely covered with erect hairs, soon becoming subglabrous, margins revolute; stamens 1–1.5 mm long, connective shield densely hairy. Monocarps 10– 20, green in vivo, brown in sicco, ellipsoid to fusiform, 9–18 by 6–10 mm, longitudinally wrinkled in sicco, sparsely covered with erect hairs, soon becoming glabrous, apex rounded to apiculate (apiculum to. 1 mm long), wall c. 1 mm thick, stipes 0–4 by 2 mm. Seed ellipsoid, c. 15 by 7 mm, pale brown, smooth, raphe not distinct from rest of seed.

Distribution — Brazil (Amazonas, Manaus Region).

Habitat & Ecology — In non-inundated, primary or secondary terra firme forest, one collection from campinarana vegetation, on sandy soil. At elevations of about sea level. Flowering: Janu- ary, October; fruiting: January, August to October.

Vernacular names — Brazil: Envira (Krukoff 7923), Envireira (L. Coêlho INPA 5805).

Notes — Guatteria duckeana together with G. citriodora , G. schomburgkiana and G. stipitata forms part of the G. schomburgkiana complex, see Table 4 (p. 59). This group, placed by Fries (1939) in sect. Cephalocarpus which originally consisted of eight species, has as its main features short-pedicelled flowers and sessile to very shortly stipitate monocarps. The densely hairy connective shield also is a distinctive feature of this group (vs papillate or glabrous in most Guatteria species).

Guatteria duckeana , restricted to the Manaus region in Central Amazonian Brazil, is marked by coriaceous leaves with indistinct venation and revolute margins near the base, sepals and petals with revolute margins, and by its very large, subsessile monocarps and pointed seeds of c. 15 by 7 mm.

Figures

Fig. 34 Guatteria duckeana R.E.Fr. Flowering branch (Ducke RB 29019, holotype S).