肉桂屬（學名：Cinnamomum），是樟目樟科的一屬植物，為常綠喬木或灌木[1]，約有300種存在。
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肉桂屬在早始新世起源於勞亞古陸，在新生代時擴張到北半球高緯度地區, 在晚始新世後由於氣候變冷向南退縮, 並因白令陸橋的消失而形成跨太平洋的間斷分布[2]。
屬名Cinnamomum源於希臘語kinnamomon，即肉桂樹。狹義樟屬（Camphora）拆分出之前，本屬更多地被稱為樟屬。
肉桂屬的部分物種如下：
- Cinnamomum aromaticum 異名： Cinnamomum cassia
- 毛桂 Cinnamomum appelianum
- 華南桂 Cinnamomum austro-sinense
- 滇南桂 Cinnamomum austro-yunnanense
- 鈍葉桂 Cinnamomum bejolghota
- 陰香 Cinnamomum burmanii
- 狹葉陰香 Cinnamomum burmannii f. heyneanum
- 肉桂 Cinnamomum cassia
- 聚花桂 Cinnamomum contractum
- 大葉桂 Cinnamomum iners
- 天竺桂 Cinnamomum japonicum
- 爪哇肉桂 Cinnamomum javanicum
- 野黃桂 Cinnamomum jensenianum
- 蘭嶼肉桂 Cinnamomum kotoense
- 紅辣槁樹 Cinnamomum kwangtungense
- 軟皮桂 Cinnamomum liangii
- 銀葉桂 Cinnamomum mairei
- 土肉桂 Cinnamomum osmophloeum
- 少花桂 Cinnamomum pauciflorum (山桂皮)
- 屏邊桂 Cinnamomum pingbienense
- 刀把木 Cinnamomum pittosporoides
- 網脈桂 Cinnamomum reticulatum
- 卵葉桂 Cinnamomum rigidissimum
- 細葉香桂 Cinnamomum subavenium
- 柴桂 Cinnamomum tamala
- 假桂皮樹 Cinnamomum tonkinense
- 辣汁樹 Cinnamomum tsangii
- 平托桂 Cinnamomum tsoi
- 粗脈桂 Cinnamomum validinerve
- 錫蘭肉桂 Cinnamomum verum
- 川桂 Cinnamomum wilsonii
- 藪肉桂 Cinnamomum yabunikkei
- Cinnamomum zeylanicum ，異名：Cinnamomum verum
現拆分至狹義樟屬的物種：
- 猴樟 Camphora bodinieri ≡ Cinnamomum bodinieri
- 短序樟 Camphora brachythyrsa ≡ Cinnamomum brachythyrsum
- 堅葉樟 Camphora chartophylla ≡ Cinnamomum chartophyllum
- 尾葉樟 Camphora foveolata ≡ Cinnamomum foveolatum
- 雲南樟 Camphora glandulifera ≡ Cinnamomum glanduliferum
- 八角樟 Camphora illicioides ≡ Cinnamomum ilicioides
- 油樟 Camphora longepaniculata ≡ Cinnamomum longepaniculatum
- 沉水樟 Camphora micrantha ≡ Cinnamomum micranthum
- 米槁 Camphora migao ≡ Cinnamomum migao
- 毛葉樟 Camphora mollifolia ≡ Cinnamomum mollifolium
- 樟 Camphora officinarum ≡ Cinnamomum camphora
- 黃樟 Camphora parthenoxylon ≡ Cinnamomum parthenoxylon
- 菲律賓樟樹 Camphora philippinensis ≡ Cinnamomum philippinense
- 闊葉樟 Camphora platyphylla ≡ Cinnamomum platyphyllum
- Camphora purpurea ≡ Cinnamomum purpureum
- 絨毛樟 Camphora rufotomentosa ≡ Cinnamomum rufotomentosum
- 銀木 Camphora septentrionalis ≡ Cinnamomum septentrionale
- 細毛樟 Camphora tenuipilis ≡ Cinnamomum tenuipile
- Cinnamomum kanehirae 牛樟
- Cinnamomum longipetiolatum 長柄樟
- Cinnamomum saxatile 岩樟
Zhou, Run; Ci, Xiuqin; Xiao, Jianhua; Cao, Guanlong; Li, Jie. Effects and conservation assessment of climate change on the dominant group—The genusCinnamomum of subtropical evergreen broad-leaved forests. Biodiversity Science. 2021, 29 (6): 697–711. doi:10.17520/biods.2020482. Huang, Jian-Feng; Li, Lang; van der Werff, Henk; Li, Hsi-Wen; Rohwer, Jens G.; Crayn, Darren M.; Meng, Hong-Hu; van der Merwe, Marlien; Conran, John G.; Li, Jie. Origins and evolution of cinnamon and camphor: A phylogenetic and historical biogeographical analysis of the Cinnamomum group (Lauraceae). Molecular Phylogenetics and Evolution. 2016-03, 96: 33–44. doi:10.1016/j.ympev.2015.12.007.
