Abuta altomacahensis

Lianas, up to 25 m tall; older stems ca. 10 cm diameter at base, younger stems and branches cylindrical, cinereous to brownish, smooth, tomentose to glabrous with age, lenticellate, sometimes marked with thin streaks. Leaves with petiole 6 – 15 cm long, cinereous to brownish, adpressed tomentose, smooth or finely striated longitudinally, tips slightly dilated, apex usually curved; blades 8 – 24 × 5 – 16 cm, flat, thick, chartaceous to coriaceous, ovate, widely elliptic or suborbiculate, base obtuse, apex acute or acuminate, sometimes with the apex damaged giving it the false appearance of obtuse or emarginated, margin entire; adaxial surface greenish, or brownish to blackish when dried, glabrous, abaxial surface whitish, or cinereous when dried, densely adpressed tomentose; venation basal actinodromous, 5 - veined prominent abaxially, midvein giving rise to two pairs of larger secondary veins, the first pair of lateral veins starting at the base and ascending, nearly reaching the apex, giving rise to 2 – 3 more distinct veins that extend nearly to the margin, the second pair of lateral veins thinner, curved-ascending to the middle third of the blade, adjacent veins distinct, reticulate with lax areoles. Pistillate inflorescences racemose, supra-axillary, solitary; rachis 2 – 7 cm long, thinner, finely striated longitudinally or smooth, cinereous to brownish, adpressed tomentose, or robust, lenticellate, glabrous when fruiting. Bracts 0.5 – 1 × 0.3 – 0.6 mm, lanceolate or elliptic, densely brownish-tomentose; pedicels 2 – 4 mm long or up to 10 mm when fruiting, brownish, adpressed tomentose. Pistillate flowers brownish, densely tomentose; sepals 9, the outer 3, 0.7 – 1 × 0.6 – 0.7 mm, the medians 3, 1 – 1.3 × 0.9 – 1.5 mm, the inner 3, 1.5 – 2 × 1.5 – 2 mm, ovate or orbiculate, base obtuse, rounded or cordate, apex obtuse or rounded; staminodes 6, 1.2 – 1.6 mm long, threadlike, brownish, densely tomentose to velutinous, except apex black and glabrous; carpels 3, 1.4 – 1.5 × 0.8 – 1 mm, sessile, brownish, densely tomentose to velutinous, style 0.1 – 0.2 mm long, reflexed, stigma 2 - lobed, sometimes entire. Drupelets 5 – 5.5 × 2.5 cm; epicarp mature orange, or black when dried, glabrous; endocarp ca. 4.5 × 2 cm, woody, with a hippocrepiform groove starting at the style scar and running along the long axis of the endocarp, both having impressed veins on each lateral surface, condyle deeply ensconced in the seed, giving it a hippocrepiform appearance. Seed ca. 3.5 × 1.5 cm, with a membranous coat, hyaline, adhered to the wall of the storage tissue; endosperm abundant, viscous and ruminate, made up of vesiculate parts surrounding the entire embryo. Staminate inflorescences and flowers unknown.