Guatteria myriocarpa R.E.Fr.

102. Guatteria myriocarpa R.E.Fr. View in CoL — Map 24

Guatteria myriocarpa R.E.Fr. (1939) 458, t. 32. — Type: Dahlgren & Sella 119 (holo B; iso F), Brazil, Pará , Rio Tapajós, Boa Vista, May–June 1929.

Tree c. 10 m tall, c. 25 cm diam; young twigs densely covered with appressed hairs to c. 0.5 mm long, eventually glabrous. Leaves: petiole 3–5 mm long, 1–2 mm diam; lamina narrowly elliptic, 8–16 by 2–4.5 cm (leaf index 3.2–5.5), chartaceous, not ver- ruculose, dull, blackish brown to greyish brown above, brown below, sparsely covered with appressed hairs above, the primary vein rather densely covered with erect, brown hairs above, rather densely covered with appressed hairs below, base acute to obtuse, apex acuminate (acumen 10–20 mm long), primary vein impressed above, secondary veins distinct, 13–15 on either side of primary vein, slightly raised above, smallest distance between loops and margin 2–4 mm, tertiary veins slightly raised above, reticulate. Flowers solitary in axils of leaves or on leafless branchlets; pedicels 12–15 mm long, c. 1 mm diam, fruiting pedicels not seen, rather densely covered with appressed hairs, articulated at c. 0.5 from the base, bracts c. 5, soon falling, not seen; flower buds not seen; sepals free, broadly ovate-triangular to ovate-triangular, 5–6 by 4 mm, reflexed, outer side densely covered with appressed hairs; petals colour not recorded, obovate to elliptic, 13–18 by 6–10 mm, outer side rather densely covered with appressed hairs; stamens c. 1 mm long, connective shield papillate. Monocarps c. 50, colour in vivo not recorded, black in sicco, ellipsoid, 7–9 by 3–4 mm, sparsely covered with appressed hairs, apex api- culate (apiculum <0.5 mm long), wall c. 0.1 mm thick, stipes 15–25 by 0.5–1 mm. Seed ellipsoid, c. 7 by 4 mm, brown, slightly pitted, raphe not distinct from rest of seed.

Distribution — Amazonian Brazil (Amazonas, Pará).

Habitat & Ecology — In non-inundated forest (‘firm land’). At an elevation of c. 40 m. Flowering: May, June; fruiting: Sep- tember.

Vernacular name — Brazil: Juruá-cacauo (Capucho 433).

Notes — Guatteria myriocarpa belongs to Fries’s sect. Brachystemon , characterized by young twigs densely covered with appressed and erect hairs and by small flowers and fruit for the genus. Of the 6 species of this section 5 occur in SE Brazil, the most common one being G. sellowiana .

Guatteria myriocarpa much resembles G. hirsuta , but differs by the indument on young twigs, which consists of mainly appressed hairs of up to c. 0.5 mm long, vs erect hairs 1.5–2 mm long in G. hirsuta .