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

3. Xanthophytum kwangtungense (Chun & F. C. How) H. S. Lo, Bull. Bot. Res., Harbin. 6(4): 32. 1986.

岩黄树 yan huang shu

Xanthophytopsis kwangtungensis Chun & F. C. How, Sunyatsenia 4: 14. 1939.

Shrubs, 0.5-1 m tall; branches flattened to subterete, densely sericeous to tomentose-pilose. Petiole 0.5-3 cm, densely sericeous to pilose; leaf blade drying papery, elliptic, elliptic-oblong, or ovate, 5-20 × 2.5-7 cm, adaxially glabrous or sparsely pilose at least along veins, abaxially densely sericeous or sericeous-villous, base cuneate to acute and usually long decurrent, apex acuminate; secondary veins 9-16 pairs; stipules drying membranous, persistent, ovate to triangular, 9-15 × 5-7 mm, sericeous or pilose to glabrescent, parallel-veined, acute to acuminate or bilobed for up to 1/2, margins often ciliolate. Inflorescences subcapitate to congested-cymose, many flowered, densely strigose to strigillose; peduncles 0.1-0.5 cm; flowering portion subglobose, ca. 1 cm in diam.; bracteoles linear-lanceolate, ca. 2 mm; pedicels 0-3 mm. Calyx densely strigillose to sericeous; ovary portion ellipsoid, 1.1-1.2 mm; limb lobed essentially to base, glabrous internally; lobes subspatulate to ovate or oblanceolate, 1.2-2.5 mm, obtuse to rounded, often ciliate. Corolla pale yellow, campanulate-funnelform, outside pilosulous at least on lobes; tube 2.2-2.3 mm; lobes ovate-triangular to spatulate, 1.2-1.3 mm, obtuse to acute. Infructescences often borne at lower leaf nodes or below leaves, with peduncles up to 1 cm, pedicels up to 2 mm. Fruit capsular, subglobose to ovoid, ca. 2 mm in diam., strigillose to sericeous. Fl. May, fr. Jul-Oct.

Wet places in forests. SE Guangxi, S Yunnan (Hekou) [Vietnam].

The calyx lobe measurements given here are based on Chinese specimens studied and on H. S. Lo (in FRPS 71(1): 24. 1999); Axelius (Blumea 34: 467-469. 1990) reported that these range up to 4.1 mm throughout the range of the species (i.e., in Vietnam). Several specimens of this species, in particular W. T. Tsang 23975 and 24532, were distributed as "Xanthophytum chinense Merrill," but that name has not been published.


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