Isolona campanulata Engl. & Diels

Tree or shrub to 10(-15) m tall; d.b.h. to 10(-15) cm, frequently narrowly fluted to base of crown; bark dark brown; young branches dark green, drying black, glabrous; old branches light brown drying brown to black, glabrous, striate. Petioles 3-4(-6) mm long, 1-1.5 mm in diameter, glabrous, grooved adaxially, leaf lamina inserted on side. Leaf lamina 10-15(-18) cm long, 3-7 cm wide, length:width ratio 2.2-3.9, narrowly elliptic to elliptic or narrowly obovate to obovate, subcoriaceous to papyraceous, glabrous on both sides, dark green above, light green below, sometimes with black glands, base decurrent to narrowly cuneate, apex acuminate, acumen ca. 1 cm long; midrib raised and glabrous adaxially, prominent and glabrous abaxially; secondary veins 7-12 pairs, glabrous on both sides. Inflorescences sometimes with 1(-2) additional rhipidia, on leafy branches. Flowering pedicels (5-)12-30(-35) mm long, ca. 0.5 mm in diameter; lower bracts 1-4, 2-3 mm long, 1-2 mm wide, upper bract sub-basal to halfway up pedicel, sometimes leaf-like, 2-19 mm long, 1-4 mm wide, sessile to petiolate, petiole 1-2 mm long, base cuneate, apex rounded, papyraceous, glabrous. Sepals 4-9 mm long, 3-5 mm wide, length:width ratio 1-3, broadly ovate to elliptic, papyraceous, glabrous, persistent on young fruits, base truncate, apex acute; margins glabrous. Corolla green when immature turning bright yellow at anthesis; tube 9-20 mm long, 4-5 mm in diameter, lobe:tube ratio 1-2; lobes 6-20 mm long, 2-7 mm wide, length:width ratio 2-5, triangular to narrowly triangular, apex acute, glabrous, papyraceous. Receptacle ca. 4 mm in diameter. Stamens ca. 1.2 mm long; connective shields ca. 0.1 mm long, glabrous, those of innermost stamens extended over adjacent ovary wall. Ovary ca. 2 mm long, ca. 2 mm in diameter; stigma ca. 1 mm in diameter, capitate, glabrous. Fruiting pedicels 2-5 cm long, 2-3 mm in diameter, glabrous. Fruits 4-7.5 cm long, 2-3.5 cm in diameter, length:width ratio 1.5-3, narrowly ovoid to ovoid, not apiculate, smooth with lumpy aspect on fresh and dried material, green turning deep yellow when mature; pericarp ca. 1 mm thick. Seeds 8-15 mm long, 5-10 mm in diameter, ellipsoid to transversely ellipsoid, packed in white pulp; testa rugose, dark brown, raphe thickened; hilum 5-6 mm long, 1-1.5 mm wide, narrowly elliptical.