杯冠木 bei guan mu

Cyathostemma vietnamense Bân; Uvaria yunnanensis (Hu) L. L. Zhou, Y. C. F. Su & R. K. Saunders (2009), not Li (1978).

Shrubs to 5 m tall, climbing, brownish pubescent throughout, often glabrescent. Petiole 5-8 mm; leaf blade obovate, 13-20 × 4.5-9 cm, membranous to papery, secondary veins 13-15 on each side of midvein, abaxially distinctly elevated, and adaxially slightly elevated and sparsely stellate pubescent or glabrous, base rounded to shallowly cordate, apex acute to obtuse. Inflorescences axillary, cymose, several flowered. Flowers small. Pedicel 1-1.5 cm, densely stellate pubescent; bracteoles 1 or 2, oblong to obovate, 4-13 mm. Calyx cupular; sepals reniform, densely stellate pubescent. Petals yellowish green; outer petals broadly ovate, ca. 7 × 7 mm; inner petals ca. 6 × 5 mm. Stamens ca. 3.5 mm; connectives broadly conic, puberulent. Carpels ca. 3.5 mm, densely pubescent; ovules 4-14 per carpel, in 2 series; stigmas conic, glabrous. Fruiting pedicel 0.7-4 cm; monocarps ellipsoid, 4-7 × 3-4 cm; epicarp tubercular and densely tomentose to glabrous. Fl. Jun-Jul, fr. Aug-Oct.

Scrub on slopes; ca. 1000 m. S Yunnan [Vietnam].

Cyathostemma yunnanense is known in China only from the type collection. Other Chinese records are based on misidentifications of material of Uvaria kurzii. Uvaria yunnanensis (Hu) L. L. Zhou, Y. C. F. Su & R. K. Saunders (Syst. Biodivers. 7: 255. 2009) appears to be a later homonym of U. yunnanensis Li (Pl. Fossils China: Tertiary 3: 19, pl. 24, t. 7, f. 4. 1978, not seen), based on fossil material. A new epithet would be required if Cyathostemma was included within Uvaria because of the blocking name U. vietnamensis Meade (2005).