中国玉叶金花属一新记录种——长瓣玉叶金花

Mussaenda longipetala,A Newly Recorded Species of Mussaenda(Rubiaceae) from China

报道中国茜草科(Rubiaceae)玉叶金花属一新记录种——长瓣玉叶金花(Mussaenda longipetala H.L.Li)。该种在形态上与尾裂玉叶金花(M.caudatiloba D.Fang)和狭瓣玉叶金花(M.lancipetal X.F.Deng&D.X.Zhang)相似,但区别在于叶片长圆状卵形或椭圆状卵形,托叶早落,正常的萼裂片长6～8 mm,花冠管长约3 cm,裂片披针形,长约12 mm。目前仅知分布于越南北部的广宁省和中国的广西北部湾沿海地区。凭证标本存放于广西植物标本馆(IBK)。

Mussaenda longipetala H. L. Li is reported as a new record to China. It is similar to M. caudatiloba D. Fang and M. lancipetal X. F. Deng ＆ D. X. Zhang, but differs in its leaf blades oblong-ovate or elliptic-ovate, stipules caduceus, calyx lobes 6-8 mm long, corolla tube ca. 3 cm long, corolla lobes lanceolate, ca. 12 mm long. The species is only found in Quang Ninh Province of northem Vietnam and coastal areas of Beibu Gulf in Guangxi, China. The voucher specimens are kept in Herbarium of Guangxi Institute of Botany （IBK）.