sentences:  The thick brown bark is fibrous, with deep vertical furrows running down the trunk.The leaves are arranged oppositely on the stems, and pairs grow close together so that they resemble a whorled group of four leaves.On 0.7–1.3 cm long petioles, the thick leaves are ovate to ellipictal and measure 7–10 cm (2.5–4 in) long and 2.5–4.5 cm (1–1.6 in) across with recurved margins.