Cremastosperma monospermum (Rusby) R. E. Fr.

Tree or shrub, 1–12 m tall, 4–10 cm diam.; young twigs and petioles glabrous. Leaves: petioles 5–10 by 1–3 mm; lamina obovate, elliptic or narrowly so, (8-)10–35 by 4–12 cm (index 2–3.5), chartaceous, green to brown, darker above, veins often reddish below, glabrous on both sides or rarely sparsely covered with appressed whitish to 0.4 mm long hairs on primary vein below, base acute to obtuse, rarely narrowly cuneate, mostly decurrent, apex acuminate to caudate (acumen/cusp 5–30 mm long), primary vein 1–2 mm wide at widest point, secondary veins 6–10, intersecondary veins 0–3, distance between from 10–18 mm at the base to 12–24 mm closer to the apex, angles with primary vein from 70–80° at the base to 40–50° closer to the apex, rarely branching, forming mostly distinct loops, smallest distance between loops and margin 2–6 mm, tertiary veins mostly reticulate. Inflorescence of single flowers solitary (or clustered in groups of 2), on leafy or leafless twigs; peduncles 2–10 by 0.5–1 mm (in flower), 2–10 by 1.5–2 mm (in fruit), sparsely covered with appressed to erect golden to 0.1 mm long hairs or glabrous; pedicels 40–50(-70) by 0.5–1 mm at the base (in flower), (12-)22–73 by 1–1.5 mm (in fruit), green or reddish in vivo, glabrous; 2 lower bracts, deltate, ca. 0.8 by 0.8 mm (occasionally large and leafy), obtuse, soon falling off, sparsely covered with appressed golden 0.1 mm long hairs or glabrous; upper bract mostly attached around half way along pedicel, narrowly ovate or deltate, 1–2.5 by ca. 1 mm, acute, obtuse, rounded or truncate, outer side sparsely covered with appressed golden 0.1 mm long hairs or glabrous; closed flower buds broadly ovoid-triangular, remaining closed (or nearly so) throughout development; flowers green, maturing to creamy yellow, yellow or orange in vivo, dark or reddish-brown or black in sicco; sepals and petals glabrous, sepals free or connate for ca. 1 mm, broadly ovate or deltate, appressed, patent or recurved, 2–4 by 2–3 mm, acute or obtuse, mostly soon falling off; outer petals ovate, 9–14 by 6–8 mm, inner petals elliptic to ovate or narrowly so, 10–13 by 4–5 mm; androecium not seen; gynoecium not seen. Monocarps 10–29, ellipsoid to broadly so, slightly asymmetrical, 9–11 by 7–8 mm, green maturing to pink, maroon, red or (blue-) black in vivo, brown, dark or reddish-brown or black in sicco, with an excentric apicule; stipes (6-)8–15 by 1 mm; fruiting receptacle 3–8 mm diam., monocarps, stipes and receptacle glabrous. Seeds broadly ovoid, reddish-brown, pitted, pits appear black with raised rim, 8–10 by 6–7 mm, raphe sunken, regular.

Bolivia (Beni, La Paz, Pando), Brazil (Acre, Pará, Rondônia) and widespread across Peru.

Cremastosperma monospermum (Rusby) R.E.Fr. – gatunek rośliny z rodziny flaszowcowatych (Annonaceae Juss.). Występuje naturalnie w Ekwadorze, Peru, Boliwii oraz Brazylii (w stanach Acre, Pará i Rondônia).

Cremastosperma monospermum là loài thực vật có hoa thuộc họ Na. Loài này được (Rusby) R.E.Fr. mô tả khoa học đầu tiên năm 1931.