Guatteria elongata Benth.

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 : 80

59. Guatteria elongata Benth. — Map 14

Guatteria elongata Benth.(1843) 359; R. E.Fr.(1939) 431, t. 30. — Type : R. H. Schomburgk I 962 (holo K; iso B, BM, E, F, G, K, L, P, U, US, W), Brazil, Rio Negro , without further exact location, anno 1839 .

Tree of unknown height and diam; young twigs densely covered with appressed, brown hairs to c. 1 mm long, soon glabrous. Leaves: petiole 5–15 mm long, 1–2 mm diam; lamina nar- rowly oblong-elliptic, 12–23 by 5–6.5 cm (leaf index 3.8–5), chartaceous, not verruculose, shiny above, brown on both sides, glabrous above, sparsely covered with appressed, brown hairs to c. 1 mm long below, base acute, extreme base attenuate, apex acute to acuminate (acumen to c. 10 mm long), primary vein impressed above, secondary veins distinct, 12–15 on either side of primary vein, slightly raised above, smallest distance between loops and margin 3–4 mm, tertiary veins inconspicuous, slightly raised above, reticulate. Flowers in (1–)2–4-flowered inflorescences in axils of leaves or on leaf- less branchlets; pedicels 2–8 mm long, 1.5–2 mm diam, densely covered with appressed, brown hairs to c. 1 mm long, articulated at 0.5–0.6 from the base, bracts c. 6, soon falling, basal bract (one seen) very broadly ovate, c. 1 mm long; flower buds depressed ovoid; sepals free, broadly ovate-triangular, 4–5 by 5–6 mm, appressed, outer side densely covered with appressed, brown hairs to c. 1 mm long; petals colour not recorded, obovate, 12–18 by 6–8 mm, outer side densely covered with appressed, brown hairs to c. 1 mm long at the base, towards the apex the hairs whitish; stamens c. 1.5 mm long, connective shield papillate. Monocarps and seed not seen.

Distribution — Amazonian Brazil (Amazonas).

Habitat & Ecology — Vegetation type not recorded. At an elevation of about sea level. Flowering: unknown; fruiting: unknown.

Vernacular names — Not recorded.

Notes — Guatteria elongata was placed by Fries (1939) into a section of its own, sect. Pycnantha (= ‘flowers crowded to- gether’), because of its many-flowered inflorescences and very short pedicels. As the species has never been collected since and as the material available is incomplete we cannot place it yet anywhere in the genus. It shows superficially some features of G. subsessilis (the short pedicels) but from that species it dif- fers by a completely different indument (long, brown, appressed hairs in leaves, flowers, pedicels, sepals, etc. in G. elongata vs almost completely glabrous in all parts of G. subsessilis ).

Several collections of this species have been labelled as ‘British Guiana’, but according to Van Dam (2002: 88, 89) the Robert Schomburgk type collection comes from the Rio Negro in Amazonian Brazil. The exact location could not be traced, but it is probably situated between Barcelos and Rio Padauiri, according to the data by Van Dam. The position on the map has been indicated accordingly.