Guatteria discolor 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 : 71

50. Guatteria discolor R.E.Fr. — Map 12

Guatteria discolor R.E.Fr. (1939) 509, f. 33a; Maas et al. (2007) 638; Erkens et al. (2008) 483,pl. 2. — Type: Krukoff 7047 (holo S; iso B, BR, F 2 sheets, G, K, MO, NY, U, US 2 sheets), Brazil, Amazonas , Basin of Rio Madeira, Mun. Humaitá, on plateau between Rio Livramento and Rio Ipixuna, 7–18 Nov. 1934.

Tree 13–30 m tall, 25–80 cm diam, often with plank buttresses; young twigs densely to rather densely covered with erect, reddish brown, curly hairs, soon glabrous. Leaves: petiole 5 – 10(–15) mm long, 2–4 mm diam; lamina narrowly elliptic, 15–30 by 4–10 cm (leaf index 2.8–3.7), coriaceous, sparsely to densely verruculose or not verruculose, dull, grey to greyish black above, dark brown below, rather densely covered with erect and appressed, brown hairs above, soon glabrous, densely covered with erect, reddish brown, curly hairs below, base acute, extreme base attenuate, shortly decurrent along petiole, apex acute to acuminate (acumen 10–15 mm long), primary vein impressed to raised above, secondary veins distinct, 15– 25 on either side of primary vein, impressed above, smallest distance between loops and margin 1– 2 mm, tertiary veins flat to slightly raised above, reticulate to percurrent. Flowers in 1–3-flowered inflorescences in axils of leaves; pedicels 10–20 mm long, 1–2 mm diam, fruiting pedicels to c. 25 mm long, 3–5 mm diam, densely covered with erect, reddish brown, curly hairs, articulated at 0.3–0.5 from the base, bracts 5 – 6, soon falling, broadly elliptic to elliptic, basal bracts 1–2 mm long, upper ones 8–11 mm; flower buds ovoid, pointed; sepals free, broadly ovate-triangular to ovate-triangular, 6–13 by 5 –6 mm, spreading to reflexed, outer side densely covered with erect, reddish brown, curly hairs; petals green, maturing yellowish in vivo, narrowly ovate to narrowly obovate, 15–40 by 6–16 mm, outer side densely covered with erect, reddish brown, curly hairs; stamens c. 2 mm long, connective shield papillate, umbonate or not. Monocarps 10–30, dark green, maturing blueish black to black in vivo, dark brown to black in sicco, ellipsoid to narrowly so, 15–30 by 7–15 mm, surface irregularly wrinkled in sicco, sparsely covered with erect, reddish brown, curly hairs, apex rounded to apiculate (apiculum <0.5 mm long), wall 0.5–1 mm thick, stipes 2–10 by 1–2 mm. Seed narrowly ellipsoid to ellipsoid, 13–17 by 6–9 mm, brown, smooth, raphe not distinct from rest of seed.

Distribution — Colombia (Amazonas, Vaupés), French Gui- ana, Amazonian Peru (Loreto, Madre de Dios), Brazil (Acre, Amazonas, Rondônia), Bolivia (La Paz, Pando).

Habitat & Ecology — In non-inundated forest, sometimes in campinarana vegetation ( Brazil, Acre), on clayey, sometimes on sandy soil. At elevations of 0–600 m. Flowering: October to January, April; fruiting: January, April to July, October, November .

Vernacular names — Bolivia: Piraquina blanca (Terceros 1398). Brazil: Envira (Krukoff 7047, Unknown collector 17, 21), Envira-bobo (Boom et al. 8635), Envira-fofa, Envira-mole-da-folha-grande ( Daly et al. 7794), Envira-preta, Envira-rolinha, Envireira ( Daly et al. 7037). French Guiana: Matau’i, (Wayãpi name) (Grenand 554), Miret (Palikur name).

Notes — Guatteria discolor can be distinguished fairly easily by its 2-coloured leaves which are covered with an indument of erect, reddish brown, curly hairs on the lower side. Further- more, the monocarps are fairly large and wrinkled when dry, the latter feature not often seen in the genus. A third remarkable aspect are the distinctly pointed flower buds. See also under G. chrysophylla .

Guatteria discolor was placed by Fries (1939: 509) into a sec- tion of its own, namely sect. Dichrophyllum , characterized by 2-coloured leaves, a persistent indument of brownish hairs, and by leaves which are verruculose on the upper side. The latter feature appears to be quite variable, the density of verruculae ranging from densely to sparsely, and we even noticed leaves without any warts.

A vegetative collection from Bolivia (Chatrou et al. 438 (MO, U)) has very large leaves measuring 40 by 15 cm!

Figures

Map 12 Distribution of Guatteria cuatrecasasii (●), G. denudata (£), G. discolor (■) and G. dolichopoda (P).