喬木繡球學名Hydrangea arborescens f. sterilis (Torr. & A.Gray) Hydrangea St. John,八仙花(繡球花)科八仙花(繡球、繡球花、光繡球)屬落葉性灌木至小喬木植物,又稱木立繡球、光滑繡球,原產於美國,有園藝栽培種,如: 'Annabelle'(雪山八仙花、安娜貝拉)...等,株高可達三公尺,株型鬆散,莖常從基部放射狀伸出,枝條圓柱形,粗壯,紫灰色至淡灰色,單葉對生,葉闊橢圓形、橢圓形、倒卵形,端部銳尖、驟尖,基部鈍圓或闊楔形,葉緣鋸齒,葉長約六至二十五公分,寬約四至十二公分,紙質、薄紙質,葉面深綠、濃綠至綠色,皺感,羽狀脈,葉脈於葉面平坦而於葉背微凸,側脈四至八對,近葉緣處微彎拱,小脈網狀,兩面葉脈明顯,無托葉,葉柄長十至三十五公釐,粗壯,兩性花,週位花,聚繖花序,頂生,常作繖房狀、繖形狀、圓錐狀排列,呈鬆散球形,徑八至二十公分,花序由可孕花與不孕花(無性花)所組成,花近乎全為無性花,總花梗短,分枝粗壯,近等長,花梗長約二至四公釐,花密集,二型花,花序由可孕花(孕性花)與不孕花(無性花)所組成,外圍是不孕花,不孕花(無性花)明顯,不育,頂生,花萼四枚,花(萼片)淺紅至綠白、白色,直徑約五、六公分,花序中央是可孕花(孕性花),極少數,花小而不顯眼,或無可孕花,花萼鐘形,萼筒倒圓錐狀,長約一、二公釐,花萼四、五裂,與子房合生,萼齒卵狀三角形,長約一公釐,花冠鐘形,花白色,花瓣四、五枚,長圓形,長一至四公釐,鑷合狀排列,雄蕊約十枚,近等長,不突出或稍突出,花絲基部與花瓣合生,花藥長圓形,長約一公釐,雌蕊心皮二至五枚,合生,花柱約三枚,長約一、二公釐,柱頭稍擴大,半環狀,子房下位至三分之二子房上位,大半下位,子房二至四室,中軸胎座,蒴果,長陀螺狀,種子多數。
喬木繡球(Hydrangea arborescens)原屬於虎耳草(Saxifragaceae)科,依分類法劃入八仙花(Hydrangeaceae)科。
八仙花(Hydrangea)屬常見之品種有:
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Hydrangea albostellata
Hydrangea alternifolia
Hydrangea amamiohsimensis
Hydrangea ampla
Hydrangea angustipetala(狹瓣八仙花)
Hydrangea anomala(藤繡球、冠蓋繡球)
Hydrangea arborescens(喬木繡球、木立繡球、光滑繡球)
Hydrangea arguta
Hydrangea aspera(高山藤繡球、馬桑繡球)
Hydrangea asterolasia
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Hydrangea barbara
Hydrangea bifida
Hydrangea bretschneideri(東陵繡球)
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Hydrangea caerulea
Hydrangea candida(珠光繡球)
Hydrangea caudatifolia(尾葉繡球)
Hydrangea chinensis(華八仙、中國繡球)
Hydrangea chungii
Hydrangea cinerea
Hydrangea coacta(氈毛繡球)
Hydrangea coenobialis(酥醪繡球)
Hydrangea corylifolia
Hydrangea crassa
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Hydrangea daimingshanensis
Hydrangea davidii(西南繡球)
Hydrangea densifolia
Hydrangea diplostemona
Hydrangea discocarpa(盤果繡球)
Hydrangea dumicola(銀針繡球)
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Hydrangea fauriei
Hydrangea febrifuga
Hydrangea fistulosa
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Hydrangea glabripes(光柄繡球)
Hydrangea glaucescens
Hydrangea glaucophylla(粉背繡球)
Hydrangea goudotii
Hydrangea gracilis(細枝繡球)
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Hydrangea heteromalla(微絨繡球)
Hydrangea hirsuta
Hydrangea hirta
Hydrangea hydrangeoides
Hydrangea hypoglauca(白背繡球)
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Hydrangea integrifolia(大枝掛繡球、全緣繡球)
Hydrangea involucrata
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Hydrangea jelskii
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Hydrangea kawagoeana
Hydrangea kawakamii(蝶萼繡球)
Hydrangea kwangsiensis(粵西繡球)
Hydrangea kwangtungensis(廣東繡球)
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Hydrangea lingii(狹葉繡球)
Hydrangea linkweiensis(臨桂繡球)
Hydrangea liukiuensis
Hydrangea longialata(長翅繡球)
Hydrangea longifolia(長葉繡球)
Hydrangea longipes(蓴蘭繡球)
Hydrangea luteovenosa
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Hydrangea macrocarpa(大果繡球)
Hydrangea macrophylla(繡球花、繡球)
Hydrangea macrosepala(大瓣繡球)
Hydrangea mandarinorum(灰絨繡球)
Hydrangea mangshanensis(莽山繡球)
Hydrangea mathewsii
Hydrangea moellendorffii
Hydrangea mollis(白絨繡球)
Hydrangea mollissima
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Hydrangea nebulicola
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Hydrangea obovatifolia(倒卵繡球)
Hydrangea obtusifolia
Hydrangea ofeliae
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Hydrangea paniculata(水亞木)
Hydrangea peruviana
Hydrangea petiolaris
Hydrangea platyarguta
Hydrangea preslii
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Hydrangea quercifolia
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Hydrangea radiata
Hydrangea robusta
Hydrangea rosthornii(樂思繡球)
Hydrangea rotundifolia(圓葉繡球)
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Hydrangea sargentiana(紫彩繡球)
Hydrangea scandens(藤繡球)
Hydrangea schizomollis
Hydrangea seemannii
Hydrangea serrata(澤八繡球)
Hydrangea serratifolia
Hydrangea shaochingii(上思繡球)
Hydrangea sikokiana
Hydrangea stenophylla(柳葉繡球)
Hydrangea steyermarkii
Hydrangea strigosa(蠟蓮繡球)
Hydrangea stylosa
Hydrangea sungpanensis(松潘繡球)
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Hydrangea taiwaniana
Hydrangea tarapotensis
Hydrangea taronensis(獨龍繡球)
Hydrangea tomentella
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Hydrangea viburnoides
Hydrangea villosa(柔毛繡球)
Hydrangea vinicolor(紫葉繡球)
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Hydrangea xanthoneura(掛苦繡球)
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Hydrangea yaoshanensis
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Hydrangea zhewanensis(浙皖繡球)
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Hydrangea × amagiana
Hydrangea × mizushimarum
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