Description: Habit medium sized tree to 25 m tall, 60 cm diam.; young branches in sapling spiny.  Leaves unifoliolate, elliptic or slightly ovate, 8–15 x 3.5–7.5 cm; apex acute to shortly acuminate and emarginate; margin subcrenulate; secondary veins 7–11 pairs; petioles 1–2 cm long, narrowly winged or wingless.  Inflorescences solitary, Flowers 5-merous; pedicels 1–3.5 mm long; petals white, fragrant; stamens 18–20; ovary (6–)9–10 carpellate, ovules 1–3(–5) per locule; style columnar; stigma flat.  Fruits subglobose to slightly pyriform, 5–7 cm in diameter, green, turning deep yellow when ripe, smooth or bumpy; pericarp ca 6 mm thick; pulp-vesicles pale greenish to yellowish, juicy. Seeds numerous, to ca 2 cm long.

Thai name: Som chit tai (ส้มจี๊ดใต้).

Photos: Rachun Pooma (Khao Chalongchai, Thanto, Yala).