Guatteria dura 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 : 75-77

55. Guatteria dura R.E.Fr. — Map 13

Guatteria dura R.E.Fr. (1939) 499; Maas & Westra (2011) 121, f. 1b, 6, 7. — Type: Spruce 3354 (holo K; iso BM, BR, K, P), Venezuela, Amazonas, Río Pasimoni , Feb. 1852.

Guatteria kuhlmannii R.E.Fr. (1939) 498. — Type: J.G. Kuhlmann 460 = RB 24256 (holo S; iso NY,RB,SPF), Brazil, Rondônia, Rio Ouro Preto,affluent of Rio Pacaás Novos , 17 Sept. 1923.

Tree or shrub 2–30 m tall, 5–50 cm diam; young twigs densely covered with appressed to half-appressed hairs 1–2 mm long, soon glabrous. Leaves: petiole 5–10 mm long, 3–4 mm diam; lamina elliptic to obovate or narrowly so, 12–28 by 5–12 cm (leaf index 1.6–4), coriaceous, densely and coarsely verrucu- lose (the verruculae often tending to form strings ), dull above, brown on both sides, glabrous above, rather densely to sparsely covered with appressed to half-appressed hairs 1–2 mm long below, base acute, often slightly attenuate, apex acuminate (acumen 5–10 mm long), primary vein impressed above, sec- ondary veins distinct, 12–18 on either side of primary vein, flat to slightly impressed above, smallest distance between loops and margin 2 – 5 mm, tertiary veins inconspicuous and hardly visible above, percurrent to reticulate. Flowers in 1(–3)-flow- ered inflorescences in axils of leaves or on leafless branchlets; pedicels 5– 20 mm long, 1–2 mm diam, fruiting pedicels to c. 30 mm long, c. 3 mm diam, densely to sparsely covered with appressed hairs, articulated at 0.3–0.5 from the base, bracts 5–7, soon falling, basal bract depressed ovate, c. 2 mm long, the uppermost broadly ovate, c. 4 mm long; flower buds de- pressed ovoid; sepals free, broadly ovate-triangular, 5–8 by 5–7 mm, reflexed, outer side densely covered with appressed hairs; petals green, maturing cream, white, or yellow in vivo, narrowly elliptic to elliptic or obovate-elliptic, 15–40 by 5–17 mm, outer side sparsely covered with appressed hairs, the base and young petals densely so; stamens 1.5–2 mm long, con- nective shield papillate to glabrous. Monocarps 25– 50, green, maturing purplish black in vivo, brown in sicco, ellipsoid, 18–19 by 7–11 mm, sparsely covered with appressed hairs, apex apiculate (apiculum <0.5 mm long), wall 0.3–0.5 mm thick, stipes 5–10 by 1–1.5 mm. Seed ellipsoid, 15–18 by 6–8 mm, dark, shiny brown, rugulose to longitudinally grooved, raphe not distinct from rest of seed.

Distribution — Amazonian Colombia (Amazonas, Vaupés), Venezuela (Amazonas), Peru (Loreto), Brazil (Amazonas, Mato Grosso), Bolivia (Beni).

Habitat & Ecology — In periodically inundated or sometimes non-inundated forest or in scrub savanna, often on clayey soil. At elevations of up to c. 175 m. Flowering: January, February, April, June, August to November; fruiting: March, April.

Vernacular names — Colombia: Jaacu (Muinane name), Jaacuo (Muinane name) (V an Andel et al. 136), Jakup (Muinane name) (Urrego et al. 1417, 1572), Jimogï (Huitoto name) (Urrego et al. 1785, 1979), Vara blanca (Urrego et al. 293A). Peru: Carahuasca (Rimachi Y. 8814). Venezuela: Majagua (Ll. Williams 15862), Majagua negra (Velazco 2007).

Notes — Guatteria dura is easily recognizable by densely and coarsely verruculose leaves, in which the large verrucae often tend to form strings .

Guatteria dura resembles G. meliodora in many aspects, among others by the thick leaves which completely lack the marginal vein so often found in this section; G. dura differs, however, by the densely verruculose lamina, the warts often forming strings vs the sparsely verruculose lamina with warts never forming strings in G. meliodora . The distinction between both species requires further study.

There is quite some variation in petal size and shape in G. dura : in Stergios et al. 9935 the petals are obovate measuring 20–30 by 15–17 mm, whereas in Colella et al. 2145 they are very large and narrow, namely 28–40 by 8–12 mm.

The only collection from Bolivia (Guillén & Soliz 3833) is aber- rant by the upper side of the leaves being greyish green rather than brown.