Hexalobus bussei Diels

Evergreen tree of 20-30 m tall; trunk slender, dbh unknown; bark smooth, fibrous, peeling of in narrow flakes, grey-brown to grey-black; twigs pale brown to dark brown, hairy when young. Leaves: petiole short and thick, 1-7 mm long, 2.5-4 mm wide, sparsely covered with erect or appressed, 0.1-0.2 mm long, brownish hairs; leaf blade obovate to narrowly obovate, 15.5-36 cm long, 5.5-10.5 cm wide, apex acuminate, base cordate, coriaceous; upper surface sometimes slightly bullate, glossy, often greyish, glabrous, lower surface brown when dry, glabrous or sparsely covered with appressed, brown, c. 0.2 mm long hairs; midrib covered with small, erect, white hairs above, below covered with appressed, light brown hairs; secondary veins distinct on each side, 12-17 pairs, at angles of 55-85º with the midrib; tertiary venation closely reticulate, distinct on the lower surface. Flowers usually solitary or sometimes clustered in groups of two on short shoots, fragrant; flower stalk 10-12 mm long; the part of the flower stalk below the articulation 4-5 mm long, 2-3 mm in diam., in fruit 4-5 mm in diam.; bracts several, dark brown when dry, two upper bracts free or seemingly fused at their base and then forming a short tube of 1-2 mm long, soon falling except when fused, c. 6-13 mm long, third bract c. 5 mm long, 3.5 mm wide, other bracts smaller; part of the flower stalk above the articulation 6-7 mm long, 4-5 mm in diam., in fruit 6-8 mm in diam., densely covered with appressed, rusty-brown, c. 0.2-0.3 mm long hairs; buds broadly ovoid to almost globose, c. 15-17 mm in diam.; sepals 16-20 mm long, 11-14 mm wide, outside covered with cream to brown, 0.1-0.5 mm long hairs; corolla pale yellow, base dark purple, lobes lanceolate, 3-5 mm in length, rounded at apex, 23-40 mm long, 8-10 mm wide, outside covered with appressed, whitish, c. 0.1-0.2 mm long hairs, apical hairs shorter than basal ones, inner side covered with appressed, c. 0.1 mm long hairs, base seemingly glabrous but in fact covered with < 0.1 mm long hairs; stamens numerous, oblong, 6.5-8 mm long, 1.5 mm wide, connective appendage elongated, broadened, oblique; carpels 3-7, 4.5-5 mm long, 1-1.3 mm wide, densely hairy; stigmas attached to the top of the ovary often bending in a horizontal position, 3-4.6 mm long, 1-4 mm wide. Monocarps 2-4, subsessile, ellipsoid, 5.3-7.8 cm long, at least 4 cm in diam., strongly but irregularly ribbed in a reticulate pattern to rugose, orange, sparsely covered with rusty-brown, short hairs; seeds 7-16, biseriate, flattened ellipsoid to ovoid, 23-28 mm long, 17-19 mm wide, 8-10 mm thick, shiny, orange-brown, raphe slightly raised, concolourous with the seed or slightly darker brown