柱果木榄 zhu guo mu lan

Rhizophora cylindrica Linnaeus, Sp. Pl. 1: 443. 1753; Bruguiera caryophylloides (N. L. Burman) Blume; Rhizophora caryophylloides N. L. Burman.

Trees 10-15 m tall, d.b.h. 15-25 cm. Bark gray, smooth, with few lenticels. Stipules 2.5-3.5 cm. Petiole 1-3.5 cm; leaf blade elliptic, 7-17 × 2-8 cm, thin, secondary veins abaxially remote and thin, reticulate veins mostly obscure, base cuneate, apex acute. Cymes pedunculate, 2- or 3-flowered. Pedicel 1-4 mm. Flowers greenish, less than 2 cm. Calyx tube 4-6 × ca. 2 mm, not ribbed, smooth; lobes 7 or 8, ± as long as tube. Petals white but soon turning brown, 3-4 mm, 2-lobed, outer margins usually basally fringed with white hairs. Stamens 1.5-2.5 mm. Disk in open flowers not entirely lining calyx tube. Style 3-4 mm. Fruiting calyx tube ca. 1 cm, slightly ribbed; lobes recurved. Hypocotyl cylindric, often curved, 8-15 × ca. 0.5 cm. Fl. autumn, fr. winter-spring (and sporadically year-round).

Mangrove forests; sea level. Hainan [India, Indonesia, Malaysia, Myanmar, Philippines, Sri Lanka, Thailand, Vietnam; N Australia, New Guinea, Pacific islands].