What Is Zhike (Bitter Orange)? A Detailed Explanation of the Five Major Differences Between Zhike and Zhishi

Zhike, also called sour orange or bitter orange, is a small tree whose fruit is spherical or oblate, colored orange-yellow to vermilion, and can be processed into other products or dried for medicinal use. So, what exactly is Zhike? It differs from Zhishi by just one character; what is the difference between the two?

I. What Is Zhike?

1. Zhike is a small tree of the Rutaceae family, Citrus genus, with dense branches and leaves, deep green foliage, and long, numerous thorns. It blooms from April to May and fruits from September to December. The flowers vary in size, the flower buds are elliptical or nearly spherical, and the fruit is spherical or oblate.

2. Zhike is a citrus fruit, generally referring to sour orange, with thick peel, orange-yellow to vermilion in color, difficult to peel, with a solid or semi-solid core and 10-13 segments. The flesh tastes sour, sometimes bitter or with a peculiar odor, and the seeds are numerous and large.

3. Zhike is a southern tree species, native to various places south of the southern slope of the Qinling Mountains in China, distributed across the Yangtze River basin and provinces south of it in China. It prefers warm and humid conditions, abundant rainfall, and sufficient sunlight, and is widely used as a rootstock for grafting sweet oranges and mandarins.

4. Zhike is a fruit with a wide range of uses. Its juice content reaches as high as 43%, and its amino acid content ranks first among citrus fruits. It can be processed into beverages, canned goods, candied fruit, jam, and more. The peel can be used to extract aromatic oil, pectin, and jelly.

5. Zhike is a traditional Chinese medicine, the dried immature fruit of sour orange and its cultivated varieties. It has the effects of regulating qi and soothing the middle, moving stagnation and relieving distension, and can treat conditions such as qi stagnation in the chest and hypochondrium, distension and pain, indigestion, phlegm-fluid retention, gastroptosis, rectal prolapse, and uterine prolapse.

II. What Is the Difference Between Zhike and Zhishi?

Difference 1, age differs: Both are the dried fruit of sour orange and its cultivated varieties, a tree of the Rutaceae family, Citrus genus, but Zhike is the dried immature fruit, harvested in July when the peel is still green; while Zhishi is the dried young fruit, collected from fallen fruit in May to June.

Difference 2, morphology differs: Zhike is hemispherical, 3-5 cm in diameter, with the outer peel brown to dark brown, and the mesocarp on the cut surface yellowish-white, with the juice sacs shrunken and brown to dark brown; Zhishi is hemispherical or spherical, 0.5-2.5 cm in diameter, with the outer peel blackish-green or dark brownish-green, and the mesocarp on the cut surface yellowish-white or yellowish-brown, with the pulp segments brown.

Difference 3, effects differ: Both have a clear qi fragrance and a bitter, pungent, sour taste, and are mildly cold in nature, but the effect of Zhike is to regulate qi and soothe the middle, move stagnation and relieve distension, while the effect of Zhishi is to break qi and eliminate accumulation, resolve phlegm and disperse masses. The effects are somewhat similar, but Zhishi is strong while Zhike is mild.

Difference 4, pharmacology differs: Their effects are similar, but the pharmacological actions still differ somewhat. Zhike has relatively weak qi-moving power and serves as a stomachic, tonic, carminative, and flavoring agent, while Zhishi has relatively strong qi-moving power and is clinically called a qi-breaking medicine.

Difference 5, usage differs: Zhike is gentle and mild in nature, while Zhishi is bitter and fast-acting. For qi in the chest, use Zhike; for qi below the chest, use Zhishi. For qi stagnation, use Zhike; for firm qi, use Zhishi. Generally, for thin and weak people or ordinary qi stagnation, use Zhike; for strong and sturdy people or severe qi stagnation, use Zhishi.

Summary: Zhike generally refers to sour orange, a tree of the Rutaceae family, Citrus genus. Its fruit is spherical or oblate, can be processed into other products, can be dried for medicinal use, and can also be used to extract aromatic oil, pectin, and jelly. It differs from Zhishi by just one character, yet they are different things. The five differences above can help distinguish them, and we hope they are useful to everyone.