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

25. Lasianthus obscurus (Blume ex Candolle) Miquel, Fl. Ned. Ind. 2: 317. 1857.

林生粗叶木 lin sheng cu ye mu

Mephitidia obscura Blume ex Candolle, Prodr. 4: 453. 1830; Lasianthus kurzii J. D. Hooker var. fulvus C. Y. Wu & H. Zhu; L. kurzii var. sylvicola H. S. Lo.

Shrubs, to 3 m tall; branchlets spreading tomentose or densely pilosulous. Petiole 5-10 mm, spreading tomentose or pilosulous to villous; leaf blade membranous, elliptic-oblong to oblong, 12-20 × 3-5 cm, glabrous adaxially, spreading tomentose or villous abaxially, base cuneate to acute, apex acuminate; lateral veins 7-10 pairs; nervules parallel, distinct on both surfaces; stipules generally persistent, triangular or oblong-lanceolate, 4-8 mm, tomentose or pilosulous to strigillose. Inflorescences glomerulate or subcapitate, sessile; bracts persistent, outer bracts ovate, inner bracts lanceolate, all 1-5 mm, tomentose or pilosulous to villous. Flowers sessile or subsessile. Calyx densely tomentose or strigose; hypanthium portion campanulate, 1-1.5 mm; limb deeply lobed; lobes 4-6, triangular, ca. 2 mm. Corolla 5-6 mm, puberulent outside on upper part, pubescent inside at throat. Fruit subglobose, 4-6 mm in diam., tomentose; pyrenes 5 or 6.

Forests, shaded and wet places; 300-1200 m. Hainan, Yunnan [India (S Andaman Islands), Indonesia (Java, Sumatra), Myanmar, Thailand, Vietnam].

H. Zhu (Syst. & Geogr. Pl. 72: 80. 2002) noted that this species is very similar to Lasianthus chrysoneurus.


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