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FOC | Family List | FOC Vol. 19 | Rubiaceae | Caelospermum

1. Caelospermum truncatum (Wallich) Baillon ex K. Schu­mann in Engler & Prantl, Nat. Pflanzenfam. 4(4): 136. 1891.

穴果木 xue guo mu

Webera truncata Wallich in Roxburgh, Fl. Ind. 2: 538. 1824; Caelospermum kanehirae Merrill; C. morindiforme Pierre ex Pitard; C. scandens Blume.

Lianas or weak shrubs, to 15 m high; branches weakly flattened to subterete or quadrangular, glabrous or glabrescent. Leaves opposite; petiole 10-25 mm, glabrous to puberulent; blade drying leathery or thickly papery and brownish yellow to pale black, elliptic, elliptic-oblong, lanceolate-oblong, ovate, or obovate, 7-15 × 3-10 cm, adaxially glabrous, abaxially paler and glabrous to puberulent, base cuneate to rounded, apex acute, obtuse, or rounded; secondary veins 4-7 pairs, with pilosulous domatia; stipules broadly triangular, 1-4.5 mm, truncate or 2-denticulate. Inflorescence a cymose panicle of 3-9 corymbs or umbels, 6-17 cm, mealy puberulent; peduncles 2.5-4 cm; umbels 3-20-flowered; bracts reduced. Flowers free, subsessile to pedicellate, pedicels to 6(-11) mm. Calyx mealy puberulent to glabrescent; ovary portion subglobose to cupuliform, 1-1.5 mm; limb 1-2 mm, truncate or 4- or 5-denticulate. Corolla salverform, outside glabrous to sparsely papillose; tube (4-)5-6(-9) mm, pubescent in upper part and throat; lobes linear to oblong-linear, (4.5-)5-6(-12) mm. Drupes subglobose, 8-12(-27) mm in diam. Fl. Apr-May, fr. Jul-Sep.

Thickets or sparse forests on hills or mountains; sea level to 1900 m. Guangxi, Hainan [Cambodia, Indonesia (Borneo, Java, Sumatra), Malaysia, Thailand, Vietnam].

Measurements in parentheses here come from Johansson’s (Blumea 3: 265-297. 1988) description of this species throughout its range. He noted that the most widely used name for this species is Caelospermum scandens, here included as an aid to relating the Chinese species to the SE Asian flora.


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