Cremastosperma oblongum R. E. Fr.

Tree or shrub 2–17 m tall, 6–15 cm diam.; young twigs and petioles sparsely covered with appressed golden hairs to 0.4 mm long. Leaves: petioles 5–16 by 2–4 mm; lamina elliptic, obovate or narrowly so, 13–45 by 5–12 cm (index 2.5–4), coriaceous, shiny grey-green or brown above, dull brown below, glabrous above, sparsely covered with appressed golden hairs to 0.4 mm long on veins below, base acute, rarely cordate, apex acuminate (acumen (5–)10–20 mm long), primary vein grooved in basal half, 2–4 mm wide at widest point, secondary veins 8–19, intersecondary veins often 1(–2), distance between from 8–24 mm at the base to 12–27 mm closer to the apex, angles with primary vein from 40–70° at the base to 20–60° closer to the apex, sometimes branching, forming distinct loops, smallest distance between loops and margin 2–5 mm, tertiary veins mostly percurrent. Inflorescence of single flowers clustered in groups of up to three, on leafy or leafless twigs (occasionally on main stem, then on brachyblasts); peduncles ca. 2 by 1 mm (in flower), 2–5 by 1.5–3 mm (in fruit); pedicels 7–18 by ca. 1 mm at the base (in flower), 12–35(–80) by 1.5–3 mm (in fruit), peduncles and pedicels sparsely covered with appressed whitish hairs to 0.1 mm long; 2 or 3 lower bracts, deltate, 0.5–1 by 0.5–1 mm, obtuse, soon falling off or persistent, sparsely covered with appressed whitish hairs to 0.1 mm long; upper bract attached in basal half of pedicel, shallowly triangular, ca. 1 by ca. 2 mm, obtuse, persistent, sparsely covered with appressed whitish hairs to 0.1 mm long; closed flower buds not seen; flowers green maturing to cream, yellow or orange/yellow in vivo, black in sicco; sepals free, deltate, often recurved, ca. 2 by 2 mm, acute, soon falling off, sparsely covered with appressed whitish hairs <0.1 mm long or glabrous; petals glabrous, outer petals obovate to narrowly so, ca. 16 by 6–8 mm, inner petals elliptic to narrowly so, 15–16 by 4–6 mm; androecium ca. 8 mm diam., stamens 1–1.5 mm long, connective appendage 0.5–0.8 mm wide; gynoecium ca. 1.5 mm diam., carpels sparsely covered with erect golden hairs <0.1 mm long. Monocarps 6–20, ellipsoid, asymmetrical, 16–20 by 10–14 mm, green maturing through orange or red to black in vivo, brown or black in sicco, with an excentric apicule; stipes green maturing to red in vivo, 9–17 by 2–3 mm; fruiting receptacle 7–12 mm diam.; monocarps, stipes and receptacle glabrous. Seeds ellipsoid, reddish-brown, pitted, ca. 13 by 8 mm, raphe raised, regular.

Central and southern Peru (Cuzco, Huánuco, Junín, Loreto, Madre de Dios, Pasco, San Martín and Ucayali) and adjacent Brazil (Acre).