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

1. Xanthophytum attopevense (Pierre ex Pitard) H. S. Lo, Bull. Bot. Res., Harbin. 6(4): 32. 1986.

琼岛岩黄树 qiong dao yan huang shu

Paedicalyx attopevensis Pierre ex Pitard in Lecomte, Fl. Indo-Chine 3: 88. 1922.

Shrubs or herbs, to 1 m tall; branches flattened to subterete, densely sericeous to pilose. Petiole 0.2-2 cm, densely sericeous; leaf blade drying membranous or thinly papery, narrowly elliptic or oblanceolate-oblong, 10-20 × 3.5-6 cm, adaxially moderately to sparsely villous to hirsute, abaxially rather densely hirtellous to hirsute on veins and densely sericeous on lamina, base acute and often decurrent, apex acuminate or shortly acuminate; secondary veins 17-30 pairs; stipules persistent, ovate or lanceolate, 12-17 × 4-8 mm, sericeous or pilose to glabrescent, longitudinally veined, caudate or acuminate. Inflorescences subcapitate, densely sericeous; peduncles 0.5-1.5 cm; heads subglobose, 0.5-1 cm in diam.; bracts triangular, 1.5-3 mm; bracteoles reduced; pedicels 0-1 mm. Calyx densely villous or strigose; ovary portion obconic, ca. 1.5 mm; lobes obovate, 1-2.5 mm, sometimes unequal, glabrescent. Corolla white, outside pilosulous at least on lobes; tube 2-2.2 mm; lobes oblong-lanceolate, ca. 1 mm. Fruit indehiscent, subglobose to didymous, ca. 2 × 2.5 mm, hirsute to sericeous. Fl. Jan-Mar, fr. May-Aug.

Dense forests. Hainan [Laos, Vietnam].

This species is circumscribed here following Axelius; many of the specimens that were included in this species by Chinese authors are here separated in Xanthophytum polyanthum.


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