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来自维基百科,自由的百科全书
方茎金丝桃的生活型态为灌木,茎具四棱或四狭翼,为此种主要的辨识特征。
叶无柄, 1.9-7 cm长,0.5-1.6 cm宽,纸质,窄椭圆形至狭披针形或长椭圆形,叶尖锐尖形至稍锐尖形或圆形而突尖,叶基楔形,叶背颜色较淡,近叶缘的叶脉明显,网状脉则极不明显,具淡色的腺点。
花序由1-3朵花组成,顶生,有时会有多达6对腋生花的枝条或单一朵花的短枝,花朵直径2.5 cm,花芽呈卵形,先端锐尖;萼片长5-8 mm,宽1-3 mm,倒披针形或椭圆形至长椭圆直线形,先端稍锐尖至锐尖或短渐尾尖形,全缘,在果实则呈直立状;花瓣10-12 mm长,6-7 mm宽,倒卵形,黄色,早落;5丛雄蕊丛生,每一丛有15枚雄蕊,会脱落;花药黄色,具琥珀色腺体;子房2-4 mm长,狭卵形,有5个子房室,5枚花柱完全合生。
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