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Annonaceae
Isolona cooperi Hutch. & Dalziel ex G.P.Cooper & Record
Nomenclature
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Tribe: MonodoreaeGenus: Isolona
SUMMARY
Tree or shrub to 6-10(-18) m high; d.b.h to 20 cm; bark coarsely rugulate, brown; young branches drying black, glabrous, smooth; old branches dark brown, glabrous, striate. Petioles 1-5 mm long, 2-3 mm in diameter, glabrous, verruculose, leaf lamina inserted on top, very weakly and narrowly grooved adaxially. Leaf lamina (15-)17-27(-29) cm long, 6-12(-15) cm wide, length:width ratio 2.2-3.9; oblong or narrowly oblong to obovate or narrowly obovate, subcoriaceous, glabrous on both sides, pale green below, dark green somewhat shiny above, base rounded to broadly cuneate, apex acuminate, acumen 1-2 cm long; midrib raised and glabrous adaxially, very prominent and glabrous abaxially; secondary veins 9-18 pairs, prominent below, printed above, straight then abruptly curved or uniformly curved upwards, loop forming towards margin. Rhipidia 1-2, on leafy branches and/or trunk. Flowering pedicels 14-25 mm long, ca. 0.5 mm in diameter, glabrous. Lower bracts 2-4, 0.5-1 mm long, glabrous. Upper bract absent. Sepals ca. 2 mm long, ca. 2 mm wide, length:width ratio ca. 1, very broadly ovate, base truncate, apex rounded, glabrous, coriaceous, pressed against tube, falling when in fruit; margins glabrous. Corolla green when immature to bright yellow and emitting a very strong sweet scent at anthesis; tube 6-11 mm, 3-5 mm in diameter, lobe:tube ratio 1.2-1.9, cupulate, glabrous; lobes 8-15 mm long, 4-6 mm wide, length:width ratio 1.6-3.2, narrowly oblong to oblong, apex acute, rounded at tip, glabrous, coriaceous, spreading horizontally, margins flat. Receptacle 4-5 mm in diameter. Stamens ca. 2 mm long; connective shield ca. 0.2 mm long, glabrous, those of innermost row extended over adjacent ovary wall. Ovary ca. 2.5 mm long, ca. 1.5 mm wide; stigma ca. 1.5 mm in diameter, glabrous. Fruiting pedicels 16-27 mm long, ca. 2 mm in diameter, glabrous. Fruits (3-)8-9 cm long, 1.5-3.0 cm in diameter, length:width ratio 2-4.5, ellipsoid to narrowly ellipsoid, apex apiculate, apicule ca. 1 cm long, smooth, glabrous, orange with white spots when mature; pericarp 1-2 mm thick, constricted over seeds in dried material but not in fresh material. Seeds 10-15 mm long, 5-10 mm in diameter, ellipsoid, packed in white pulp; testa rough, dark brown; raphe slightly thickened; hilum 4-5 mm long, 1.5-2 mm wide, elliptical.