窿缘桉Eucalyptus exserta
中文名（Chinese Name）：窿缘桉
学名（Scientific Name）：Eucalyptus exserta F. v. Muell.
英文名（English Common Name）：
别名（Chinese Common Name）：
异名（Synonym）：Eucalyptus insulana Bailey Leptospermum umbellatum Gaertn. Eucalyptus exserta var. parvula Blakely
科属（Family & Genus）：桃金娘科（Myrtaceae）桉属
形态特征（Description）：中等乔木，高15-18米；树皮宿存，稍坚硬，粗糙，有纵沟，灰褐色；嫩枝有钝棱，纤细，常下垂。幼态叶对生，叶片狭窄披针形，宽不及1厘米，有短柄；成熟叶片狭披针形，长8-15厘米，宽1-1.5厘米，稍弯曲，两面多微小黑腺点，侧脉以35度-40度开角急斜向上，边脉很靠近叶缘；叶柄长1.5厘米，纤细。伞形花序腋生，有花3-8朵，总梗圆形，长6-12厘米；花梗长3-4毫米；花蕾长卵形，长8-10毫米；萼管半球形，长2.5-3毫米，宽4毫米；帽状体长5-7毫米，长锥形，先端渐尖；雄蕊长6-7毫米，药室平行，纵裂。蒴果近球形，直径6-7毫米，果缘突出萼管2-2.5毫米，果瓣4，长1-1.5毫米。花期5-9月。
分布（Distribution）：原产地在澳大利亚东部沿海的玄武岩及沙岩地区到内地较干旱地区均有分布。
用途（Use）：
引自中国植物志英文版：FOC Vol. 13 Page 323, 326
Eucalyptus exserta F. Mueller, J. Proc. Linn. Soc., Bot. 3: 85. 1859.
窿缘桉 long yuan an | Myrtaceae | Eucalyptus
Trees, 15-18 m tall. Bark on trunk and larger branches grayish brown, rough, persistent but gray; bark smaller branches smooth. Branchlets obtusely ridged, slender, usually pendulous. Young leaves opposite, shortly petiolate; leaf blade narrowly lanceolate, less than 1 cm wide. Mature with a slender ca. 1.5 cm petiole; leaf blade narrowly lanceolate, 8-15 × 1-1.5 cm, slightly twisted, both surfaces with numerous minute black glands, secondary veins at an abrupt angle of 35°-40° from midvein, intramarginal veins very near margin. Inflorescences axillary, simple, umbels 3-8-flowered; peduncle 4-20 mm, terete. Flower buds long ovate, 8-10 mm. Hypanthium semiglobose, 2.5-3 × ca. 4 mm; stipe 0-4 mm; calyptra long conic, 5-7 mm, apex acuminate. Stamens 6-7 mm; anthers parallel, dehiscing longitudinally. Capsule subglobose, 6-7 mm in diam.; disk broad; valves 4, strongly exserted from hypanthium. Fl. May-Sep.
Cultivated in Fujian, Guangdong, Guangxi, Guizhou, Hainan, Hunan, Jiangxi, Sichuan, and Zhejiang [native to NE Australia].
（责任编辑：徐晔春）
学名（Scientific Name）：Eucalyptus exserta F. v. Muell.
英文名（English Common Name）：
别名（Chinese Common Name）：
异名（Synonym）：Eucalyptus insulana Bailey Leptospermum umbellatum Gaertn. Eucalyptus exserta var. parvula Blakely
科属（Family & Genus）：桃金娘科（Myrtaceae）桉属
形态特征（Description）：中等乔木，高15-18米；树皮宿存，稍坚硬，粗糙，有纵沟，灰褐色；嫩枝有钝棱，纤细，常下垂。幼态叶对生，叶片狭窄披针形，宽不及1厘米，有短柄；成熟叶片狭披针形，长8-15厘米，宽1-1.5厘米，稍弯曲，两面多微小黑腺点，侧脉以35度-40度开角急斜向上，边脉很靠近叶缘；叶柄长1.5厘米，纤细。伞形花序腋生，有花3-8朵，总梗圆形，长6-12厘米；花梗长3-4毫米；花蕾长卵形，长8-10毫米；萼管半球形，长2.5-3毫米，宽4毫米；帽状体长5-7毫米，长锥形，先端渐尖；雄蕊长6-7毫米，药室平行，纵裂。蒴果近球形，直径6-7毫米，果缘突出萼管2-2.5毫米，果瓣4，长1-1.5毫米。花期5-9月。
分布（Distribution）：原产地在澳大利亚东部沿海的玄武岩及沙岩地区到内地较干旱地区均有分布。
用途（Use）：
引自中国植物志英文版：FOC Vol. 13 Page 323, 326
Eucalyptus exserta F. Mueller, J. Proc. Linn. Soc., Bot. 3: 85. 1859.
窿缘桉 long yuan an | Myrtaceae | Eucalyptus
Trees, 15-18 m tall. Bark on trunk and larger branches grayish brown, rough, persistent but gray; bark smaller branches smooth. Branchlets obtusely ridged, slender, usually pendulous. Young leaves opposite, shortly petiolate; leaf blade narrowly lanceolate, less than 1 cm wide. Mature with a slender ca. 1.5 cm petiole; leaf blade narrowly lanceolate, 8-15 × 1-1.5 cm, slightly twisted, both surfaces with numerous minute black glands, secondary veins at an abrupt angle of 35°-40° from midvein, intramarginal veins very near margin. Inflorescences axillary, simple, umbels 3-8-flowered; peduncle 4-20 mm, terete. Flower buds long ovate, 8-10 mm. Hypanthium semiglobose, 2.5-3 × ca. 4 mm; stipe 0-4 mm; calyptra long conic, 5-7 mm, apex acuminate. Stamens 6-7 mm; anthers parallel, dehiscing longitudinally. Capsule subglobose, 6-7 mm in diam.; disk broad; valves 4, strongly exserted from hypanthium. Fl. May-Sep.
Cultivated in Fujian, Guangdong, Guangxi, Guizhou, Hainan, Hunan, Jiangxi, Sichuan, and Zhejiang [native to NE Australia].
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