Buddha Hand Citron fruit finger looks citron 佛手柑树花果

Citrus medica var. sarcodactylis, or the fingered citron, is an unusually-shaped citron variety whose fruit is segmented into finger-like sections, resembling those seen on representations of the Buddha. It is called Buddha's hand in many languages including English, Chinese, Japanese, Korean, Vietnamese, and French.
The different cultivars and variations of this citron variety form a gradient from "open-hand" types with outward-splayed segments to "closed-hand" types, in which the fingers are kept together. There are also half-fingered fruits, in which the basal side is united and the apical side fingered. The origin of this kind of citron is commonly traced back to South or East Asia, probably northeastern India or China, where most domesticated citrus fruits originate.
Description
Citrus medica var. sarcodactylis is, like any other citron variety, a shrub or small tree with long, irregular branches covered in thorns. Its large, oblong leaves are pale green and grow about four to six inches. Its white flowers are tinted purplish from the outside and grow in fragrant clusters. The fruit's fingers contain only the white part of the fruit and sometimes a small amount of acidic pulp, but many of them are completely juiceless and some are seedless.
The plant is sensitive to frost, as well as intense heat and drought. It grows best in a temperate climate. Trees can be grown from cuttings taken from branches two to four years old. It is very commonly grafted onto sufficient rootstock.
Uses
Perfumery
Buddha's hand fruit is very fragrant and is used predominantly in China and Japan for perfuming rooms and personal items such as clothing.
Religious
The fruit may be given as a religious offering in Buddhist temples. According to tradition, Buddha prefers the "fingers" of the fruit to be in a position where they resemble a closed rather than open hand, as closed hands symbolize to Buddha the act of prayer. In China, the Buddha's hand fruit is a symbol of happiness, longevity, and good fortune. It is also a traditional temple offering and a New Year's gift.
The question of whether a Buddha's hand is acceptable for use as an etrog on Sukkot was addressed by Rabbi Abdallah Somekh and his disciple, Rabbi Yosef Hayyim, both of Baghdad. The former was inclined to permit it, whereas the latter maintained that one may not use a variety of etrog in the absence of a positive tradition of its having been used.
Ornamental
The fingered citron is cultivated as an ornamental tree in gardens and containers on patios and terraces. In the United States, its unripe fruits have been sold under the trademark goblin fingers as a decorative Halloween novelty.
Food and medicine
Unlike other citrus fruits, most varieties of the Buddha's hand fruit contain no pulp or juice. Though esteemed chiefly for its "exquisite form and aroma", the Buddha's hand fruit can also be eaten (often as a zest or flavouring) in desserts, savory dishes, and alcoholic beverages (such as vodka or rice liquor) or candied as a sweet. The sliced, dried peel of immature fruits is also prescribed as a tonic in traditional medicine.
佛手柑（學名：Citrus medica var. sarcodactylis；英語：Buddha's hand、 fingered citron），或稱佛手果、五指柑、福寿柑和密罗柑，是枸橼的变种，果实在成熟时各心皮分离，形成细长弯曲的果瓣，状如手指，故名佛手。通常應用為中药或園藝观果植物。果皮和叶中含有芳香油。
同属植物香柠檬（Citrus × bergamia）經常被误译为佛手柑，兩者其實是不同物種。
起源
佛手柑起於中國、印度等亞洲地區。
用途
中国传统医学认为，佛手柑味辛、苦、酸、温，入肝、经胃，具有理气化痰的功效。因此在潮汕地区，从明代开始，佛手柑就被制作成药用的凉果“老香黄”（也叫做老香橼、佛手香黄），是潮汕家庭必备之品，现在市面上也有出售。
佛手柑同時也是製作香水和精油的柑橘類植物之一。