Guatteria trichostemon R.E.Fr., 1939

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 : 177

165. Guatteria trichostemon R.E.Fr. — Fig. 81 ; Map 37

Guatteria trichostemon R.E.Fr. (1939) 474, f. 24e. — Type: Krukoff 8862 (holo S; iso BM, F, G, K, LE, MO, NY, P, U, US), Brazil, Amazonas, Basin of Rio Solimões, Mun. São Paulo de Olivença, Basin of Creek Belém , 26 Oct.–11 Dec. 1936.

Tree c. 20 m tall, c. 7.5 cm diam; young twigs rather densely covered with curly, erect and appressed, brown hairs, soon glabrous. Leaves: petiole 5–7 mm long, c. 1 mm diam; lamina nar- rowly elliptic, 6–10 by 2–3 cm (leaf index 2.6–3), chartaceous, not verruculose, shiny, dark blackish brown above, dark brown below, glabrous, but primary vein densely covered with erect, brown hairs above, sparsely to rather densely covered with curly, erect and appressed, brown hairs below, base attenuate, apex acuminate (acumen 5–10 mm long), primary vein impressed above, secondary veins distinct, 10–12 on either side of primary vein, raised above, smallest distance between loops and margin 2–4 mm, tertiary veins raised above, reticu- late. Flowers solitary in axils of leaves; pedicels 25–30 mm long, c. 0.5 mm diam, rather densely covered with curly, erect and appressed, brown hairs, articulated at 0.3–0.5 from the base, bracts c. 5, soon falling, not seen; flower buds depressed ovoid; sepals free, broadly ovate-triangular, 3–5 by 3–5 mm, apical part reflexed, outer side rather densely covered with appressed hairs; petals colour not recorded, oblong-elliptic, 7–10 by 4–5 mm, outer side densely covered with curly, erect and appressed, brown hairs; stamens c. 1 mm long, connective shield hairy. Monocarps and seed not seen.

Distribution — Amazonian Brazil (Amazonas).

Habitat & Ecology — In non-inundated forest.At an elevation of c. 100 m. Flowering: October to December; fruiting: unknown.

Vernacular names — None.

Note — Guatteria trichostemon , only known from the type collection, is well recognizable by its attenuate leaf base, long and slender pedicels, and a hairy connective shield. Fries placed this species in the small sect. Trichostemon (together with G. foliosa , G. maypurensis and G. polyantha ), which had as its main features a hairy connective shield, small leaves and long-stipitate monocarps. He compared G. trichostemon with G. stenopetala , but from that species it clearly differs by thinner and distinctly attenuate leaves.

Figures

Fig. 81 Guatteria trichostemon R.E.Fr. Flowering branch (Krukoff 8862, isotype U).