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FOC | Family List | FOC Vol. 11 | Euphorbiaceae | Cleistanthus

1. Cleistanthus tomentosus Hance, J. Bot. 15: 337. 1877.

锈毛闭花木 xiu mao bi hua mu

Cleistanthus eburneus Gagnepain; C. eburneus var. sordidus Gagnepain.

Treelets, rusty tomentose or pubescent except adaxial leaf surface, petals, disk, stamens, and styles glabrous. Petiole up to 5(-6) mm; leaf blade elliptic, oblong-elliptic, or lanceolate, 5-14 × (1.5-)2-5 cm, papery to thickly papery, abaxially gray-green, adaxially dark green and glossy when dried, base obtuse to rounded, rarely acute, apex acuminate or caudate-acuminate; lateral veins 8-11 pairs, obliquely ascendant, anastomosing near margin. Dense glomerules axillary or inserted on smaller-leaved or leafless branches; peduncles very short (ca. 1 mm) or almost absent; bracts small, ca. 1 × 1 mm, triangular. Male flowers subsessile or pedicels 0-3 mm; sepals 5, oblong-ovate to ovate-lanceolate, ca. 2 mm; petals 5, obovate, ca. 1 mm; disk annular, entire, ca. 1 mm high; stamens 5; filaments ca. 0.6 mm; anthers ovate, ca. 0.5 mm; rudimentary ovary ovoid-trigonous, ca. 0.5 mm. Female flowers: pedicels short but extending to ca. 5 mm in fruit; sepals 5, oblong-ovate to ovate-lanceolate, ca. 8 mm; petals and disk as in male; ovary ovoid; styles 3, apex bifid. Fruiting pedicel to 8 mm; capsule ovoid-trigonous, ca. 9 mm in diam., 3-valved when mature; carpopodium up to 8 mm. Seeds obovoid-trigonous, ca. 6 mm. Fl. Mar-Jun, fr. Jun-Sep.

Dry evergreen forests, tropical rain forests; 100-400 m. Guangdong, Hainan [Cambodia, Thailand, Vietnam].


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