古龙山秋海棠(学名:Begonia gulongshanensis),一种于中国广西壮族自治区靖西县古龙山地区发现的草本植物,隶属于秋海棠科秋海棠属侧膜胎座组(sect. Coelocentrum),[1]属于中国国家二级重点保护野生植物。
形态特征
古龙山秋海棠根状茎粗0.3-0.5厘米。托叶三角形,0.2-0.4×0.6-0.8厘米,先端锐尖,正面近无毛,背面具糙硬毛。叶全部基生,互生;叶柄长5-9厘米,具糙硬腺毛;叶片带绿色,不对称,卵状或卵状披针形,12-18×5-9厘米,基部心形,耳状,偏斜或稍偏斜,先端尾状,边缘有细锯齿;正面带绿色,节状刚毛,中间有白色半圆形,主脉沿线有暗红色斑块;淡绿色,节状短柔毛沿着细脉,疏生长柔毛和密被糙伏毛在主脉上;掌状脉约7条主脉,次脉叉状分枝,支脉稍网状,叶脉正面突出。二歧聚伞花序,腋生,花序梗长5-9厘米,具腺毛的长柔毛;苞片早落,长圆状披针形,约5×1毫米,先端渐尖,正面无毛,背面具长刚毛。雄花:花梗长1.1-1.8厘米,具腺毛的长柔毛;花被片4,粉红色到粉红色;外被片2,宽卵形,0.7-1.2×0.7-0.9厘米,先端圆形,边缘全缘,正面无毛,背面具腺毛的长柔毛;内花被片2,狭长圆形或倒卵形,0.6-1.0×0.2-0.25厘米,先端锐尖;雄蕊群辐射对称;雄蕊众多,花丝连接到一半,长约1毫米;花药黄色,倒卵形,长约0.5毫米,先端微缺。雌花:花梗长约1.1厘米,具腺毛的长柔毛;花被片3,粉红色或粉红色;外被片2,宽卵形,约0.9×1.0厘米,先端圆形,边缘全缘,正面无毛,背面具腺毛的长柔毛;内花被片1,长圆形,5-6×2-3毫米,基部楔形,先端锐尖,边缘全缘;花柱3,基部融合;柱头螺旋状,乳头状;子房绿色,椭圆形,长0.8-0.9厘米,具腺毛的长柔毛;胎座顶生,每心皮2节。蒴果下垂,3翅不等;主翅长约3.5毫米,侧翅长约2.1毫米。花期2-5月,果期5-6月。[1][2]
参考文献
- Chen, Wen-Hong; Radbouchoom, Sirilak; Nguyen, Hieu Quang; Nguyen, Hiep Tien; Nguyen, Khang Sinh; Shui, Yu-Min. Seven new species of Begonia (Begoniaceae) in Northern Vietnam and Southern China. PhytoKeys. 2018-01-29, 94: 65–85 [2023-01-08]. doi:10.3897/phytokeys.94.23248.
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