Uvariastrum hexaloboides (R. E. Fr.) R. E. Fr.

Tree up to 15 m high, d.b.h. up to 45 cm; old branches, glabrous, bark brown, striate; young branches densely pubescent, hairs ca. 0.5 mm long, appressed, brown; leaf buds elongated, pubescent, hairs ca. 1 mm long, appressed, light brown. Petioles 2–7 mm long, 1–2 mm in diameter; densely pubescent, hairs ca. 0.1–0.3 mm long, erect and appressed, red-brown, persisting in older leaves; leaf lamina inserted on the side, grooved adaxially. Leaf lamina 6–13 cm long, 2.4–5 cm wide, length:width ratio 2.4–4.4, narrowly elliptic to elliptic or narrowly obovate to obovate, coriaceous, glabrous adaxially, sparsely pubescent abaxially, hairs ca. 0.5 mm long, appressed, light brown; leaf dark green adaxially; lighter green abaxially; base cuneate to rounded, apex acuminate, acumen 1–2 cm long, emarginate; midrib densely pubescent adaxially persisting in older leaves, hairs ca. 0.1 mm long, appressed, brown; densely to sparsely pubescent abaxially, hairs ca. 0.3 mm long, appressed, brown; secondary veins 9–14, curving upwards and not fusing towards margins, glabrous, hardly visible adaxially; glabrous, slightly raised abaxially, sparsely pubescent. Raphidia 1–2, on young and old branches, sometimes cauliflorous. Flowering pedicel 0.5–1.8(-6) cm long, 1–2 mm in diameter, densely pubescent, hairs 0.3–0.5 mm long, appressed, light brown; bracts 1–2, basal, 2–7 mm long, 3–6 mm wide, length:width ratio 0.8–1, very broadly ovoid, densely pubescent, hairs ca. 0.3 mm long, appressed, light brown. Flower buds ca. 5–8 mm long, 5–8 mm in diameter, deltoid to globose. Sepals 0.9–1.5 cm long, 0.7–1.8 cm wide, length:width 0.6–1.1, very broadly to depressed ovate, base truncate, apex acute, margins very slightly folded, densely pubescent outside, hairs ca. 0.3 mm long appressed, light brown; densely pubescent inside, hairs 0.1 mm long, appressed, very light brown, more densely pubescent towards the margins. Outer petals 2–3.5 cm long, 1–1.4 cm wide, length:widt 2–3, elliptic to narrowly elliptic, densely pubescent and slightly shinny outside, hairs ca. 0.3 mm long, appressed, light brown, more densely pubescent on central vein and towards the base, densely pubescent inside, hairs shorter, ca. 0.1 mm, appressed, a paler brown. Inner petals shorter, 1–2.5 cm long, 0.8–1.5 cm wide, length:width 2–2.5, ovate, pubescence inside and outside same as outer petals; inner and outer petals yellow to green-yellow in color. Stamens ca. 3 mm long, connective discoid, ca. 0.5 mm in diameter. Carpels 10–14, ca. 3 mm long, densely pubescent, hairs ca. 0.5 mm long, appressed, light brown; stigma bilobed, ca. 1 mm in diameter, drying black, glabrous. Fruiting pedicels 0.5–2 cm long, 2–5 cm in diameter, densely to sparsely pubescent, sometimes glabrous, hairs ca. 0.2 mm long, erect or appressed, light brown. Monocarps 1–5, 2.5–6 cm long, 2–2.5 cm wide, broadly oblong to oblong, not ribbed, glabrous, red at maturity; stipes 5–9 mm long, 2–9 mm in diameter; rostre 1–2 mm long, slightly displaced to the side. Seeds 6–10 per monocarp, 1.5–2 cm long, 0.8–1.2 cm wide, transversely ellipsoid, 6–8 mm in depth, testa dark brown; raphe flat; hilum 2–3 mm long, 1–1.3 mm wide, narrowly elliptic to narrowly ovate.

Southern Democratic Republic of Congo, Katanga region (Lubumbashi), northern Zambia and one collection from the Rukwa region in Tanzania. (Figure 8).

Uvariastrum hexaloboides is a species of plant in the Annonaceae family. It is native to Tanzania, Zambia and Zaire. Robert Elias Fries, the botanist who first formally described the species using the basionym Uvaria hexaloboides, named it after a different species Hexalobus monopetalus which he thought its flowers and vegetative parts resembled.