味辛，温，无毒。主上气咳逆，结气，喉痹，吐吸，心痛，胁风胁痛，温筋通脉，止
烦出汗，利关节，补中益气。久服通神，轻身不老。生南海山谷。
陶隐居云∶南海郡即是广州。今俗用牡桂，状似桂而扁广，殊薄，皮色黄，脂肉甚少，
气如木兰，味亦类桂，不知当是别树，为复犹是桂生，有老宿者尔，亦所未究。唐本注云∶
《尔雅》云∶ （音寝），木桂。古方亦用木桂，或云牡桂，即今木桂，及单名桂者是也。
此桂花、子与菌桂同，唯叶倍长，大、小枝皮俱名牡桂。然大枝皮肉理粗虚如木，肉少味薄，
不及小枝皮肉多，半卷。中必皱起，味辛美。一名肉桂，一名桂枝，一名桂心。出融州、桂
州、交州，甚良。臣禹锡等谨按蜀本图经云∶叶狭长于菌桂叶一、二倍。其嫩枝皮半卷，多
紫肉中皱起，肌理虚软，谓之桂枝，又名肉桂。削去上皮，名曰桂心。药中以此为善，其浓
皮者名曰木桂。二月、八月采皮，晒干之。尔雅疏云∶ ，一名木桂。郭云∶今南人呼桂浓
皮者为木桂。桂树叶似枇杷而大，白华，华而不着子。丛生岩岭。枝叶冬夏常青，间无杂木。
本
图经文具桂条下。
经验后方治大人、小儿吃杂果子多。腹胀气急方∶取肉桂碾末，饭丸如绿豆大。小儿熟
水下五丸；大人十丸。未痊再服。
味辛，性温，无毒。主治上气咳逆（肺气上逆引起的咳嗽气喘），结气（气机郁结），喉痹（咽喉肿痛闭塞），吐吸（呼吸急促困难），心痛，胁风胁痛（胁肋部受风邪疼痛），温筋通脉（温暖筋脉、疏通经络），止烦出汗（消除烦躁、停止异常出汗），利关节，补中益气（补益脾胃之气）。长期服用可通神益智，身体轻盈，延缓衰老。产于南海山谷。
陶隐居说：南海郡就是现在的广州。现在民间使用的牡桂，形状像桂树但叶片和树皮较扁宽，特别薄，皮色发黄，油脂肉质很少，气味像木兰，味道也类似桂树，不知道是另一种树，还是桂树的老宿枝，这也未能深究。《唐本草》注解说：《尔雅》中说：“（音寝），木桂。”古方中也使用木桂，有人说牡桂就是现在的木桂，以及单称为“桂”的就是这种。这种桂的花、果实与菌桂相同，只有叶子长一倍，大枝和小枝的皮都叫牡桂。但是大枝的皮肉质纹理粗糙疏松如木头，肉少味道淡，不如小枝皮肉多，呈半卷状。中间必然皱起，味道辛辣甜美。又名肉桂，又名桂枝，又名桂心。出产于融州、桂州、交州，品质很好。臣禹锡等人谨按《蜀本图经》说：叶子比菌桂叶狭长一、二倍。其嫩枝皮半卷，多有紫色肉质且中间皱起，肌理虚软，叫做桂枝，又名肉桂。削去外层表皮，叫做桂心。药中以此种为善，其厚皮者叫做木桂。二月、八月采集树皮，晒干。《尔雅疏》说：“，一名木桂。”郭璞说：现在南方人称呼桂树厚皮者为木桂。桂树叶像枇杷叶但更大，开白花，开花但不结果。丛生在岩石山岭间。枝叶冬夏常青，中间没有杂木混杂。《本草图经》中关于桂的详细记载在桂条下。
经验后方治疗大人、小孩吃杂果过多导致的腹胀气急方：取肉桂碾成粉末，用米饭做丸，如绿豆大小。小孩用熟水送服五丸；大人十丸。病未痊愈再服用。
Pungent in flavor, warm in nature, non-toxic. It primarily treats upward rebellious qi with cough and wheezing (Shangqi ke ni), stagnant qi (Jieqi), throat obstruction (Houbi), dyspnea (Tuxi), heart pain, wind-pain in the hypochondrium (Xiefeng xietong), warms the sinews and unblocks the meridians (Wenjin tongmai), stops irritability and sweating (Zhi fan chuhan), benefits the joints, and tonifies the middle jiao and supplements qi (Bu zhong yiqi). Long-term use can enhance spiritual clarity, lighten the body, and retard aging. It grows in the valleys of Nanhai.
Tao Hongjing stated: The Nanhai Commandery is present-day Guangzhou. Currently, the Muguizi (Cortex Cinnamomi) used in common practice resembles cinnamon but is flatter and broader, particularly thin, with yellowish bark and very little aromatic flesh. Its odor is like Magnolia officinalis (Mulan), and its taste is similar to cinnamon. It is unknown whether this is a different tree or merely an old branch of the cinnamon tree; this has not been thoroughly investigated. The annotation of the *Tang Bencao* states: The *Erya* says: "Qin (pronounced qǐn), Mugui." Ancient prescriptions also used Mugui. Some say Muguizi is the current Mugui, as well as that simply named Guizhi (Cinnamon Twig). The flowers and fruits of this cinnamon are the same as those of Jun Gui (Junxi Cortex), except its leaves are twice as long. The bark of both large and small branches is called Muguizi. However, the bark of large branches has a coarse, spongy texture like wood, with little flesh and weak flavor, inferior to the small branch bark which is more fleshy and semi-curved. The center is necessarily wrinkled, with a pungent and sweet taste. It is also known as Rougui (Cinnamon Bark), Guizhi (Cinnamon Twig), and Guixin (Cinnamon Heart). It originates from Rongzhou, Guizhou, and Jiaozhou, and is of excellent quality. Minister Yuxi et al., according to the *Shu Ben Tu Jing*, state: The leaves are one to two times narrower and longer than those of Jun Gui. The bark of tender branches is semi-curved, often with purplish flesh and central wrinkles, with a soft texture, called Guizhi (Cinnamon Twig), also known as Rougui (Cinnamon Bark). After scraping off the outer epidermis, it is called Guixin (Cinnamon Heart). This variety is considered superior in medicine. The thick-barked variety is called Mugui. The bark is harvested in the second and eighth lunar months and dried in the sun. The commentary on the *Erya* states: "Qin," also known as Mugui. Guo Pu said: People in the south currently call the thick-barked cinnamon Mugui. Cinnamon leaves resemble loquat leaves but are larger, bear white flowers, and fruit rarely. They grow in clusters on rocky ridges. The branches and leaves remain evergreen throughout winter and summer, without intermixed trees. The detailed description in the *Bencao Tujing* is under the entry for Guizhi (Cinnamon Twig).
An empirical post-treatment formula for adults and children suffering from abdominal distension and rapid breathing due to excessive consumption of mixed fruits: Take Rougui (Cinnamon Bark), grind into powder, and form pills using rice paste, sized like mung beans. Children take five pills with cooked water; adults take ten pills. If the condition does not resolve, administer again.