Syzygium samarangense (syn. Eugenia javanica) is a plant species in the Myrtaceae, native to Philippines, India, Indonesia, Malaysia and Samoa, and widely cultivated in the tropics. English common names include wax apple, love apple, java apple, Royal Apple, bellfruit, Jamaican Apple, water apple, mountain apple, cloud apple, wax jambu, rose apple, and bell fruit.
 Cultivation and uses
Syzygium samarangense is a tropical tree growing to 12 m tall, with evergreen leaves 10–25 cm long and 5–10 cm broad. The flowers are white, 2.5 cm diameter, with four petals and numerous stamens. The fruit is a bell-shaped edible berry, with colors ranging from white, pale green, green, red, purple, crimson, to deep purple or even black, 4–6 cm long in wild plants. The flowers and resulting fruit are not limited to the axils of the leaves and can appear on nearly any point on the surface of the trunk and branches. When mature, the tree is considered a heavy bearer and can yield a crop of up to 700 fruits.
Syzygium samarangense, with a cross section of the fuit
The ripened fruit varies in hue and can be light pink to a dark, almost purple, red. One of the most highly prized and sought after wax apples in Taiwan are "black pearls," which are purplish-red. If it is ripe enough, the fruit will puff outwards, with the middle of the underside of the "bell shape" dented in a touch. Healthy wax apples have a light sheen to them. Despite its name, a ripe wax apple only resembles an apple on the outside in color. It doesn't taste like an apple, and it has neither the fragrance nor the density of an apple. Its flavor is similar to a snow pear, and the liquid to flesh ratio of the wax apple is comparable to a watermelon. Unlike either apple or watermelon, the wax apple's flesh has a very loose weave. The very middle holds a seed that's situated in a sort of cotton-candy-like mesh. This mesh is edible but flavorless. The color of its juice depends on the cultivar of the fruit; it may be purple to entirely colorless.
A number of cultivars with larger fruit have been selected. In general, the paler or darker the color is, the sweeter it is. In South East Asia, the black ones are nicknamed "Black Pearl" or "Black Diamond," while the very pale greenish white ones are called "Pearl." They are among the highest priced ones in fruit markets.[clarification needed]
The fruit is often served uncut but with the core removed, in order to preserve the unique bell shape presentation.
In Indian ocean island cuisine, the fruit is frequently used in salads, as well in with light sauteed dishes.
It is known to contain oleanolic acid, an anti-HIV compound.
Local names for this fruit include chomphu (in Thai), Mận (in Vietname), otaheti apple (in Jamaica), jambu air ("water guava" in Indonesian and Malay) makopa, tambis (Philippines), chambekka in Malayalam, jamrul (in Bengali), and jumbu (in Sri Lanka). It is called the nonu vao in Samoan. In Papua New Guinea it is called the laulau.
In Saint Kitts and Nevis it is commonly known as "morroca," a corruption of Morocco, from where the plant was imported to St. Kitts in colonial days.
In Taiwan and China, they are known as lianwu (simplified Chinese: 莲雾; traditional Chinese: 蓮霧; pinyin: lián wù; Pe̍h-ōe-jī: lián-bū).
It is known as jamalac in French, and zamalac in the French-based creole languages of Mauritius, Réunion, Seychelles and other Indian ocean islands. On Curaçao, Netherlands Antilles, the fruit is called kashu Sürnam in Papiamentu, which means ‘cashew from Surinam’, while in Surinam the fruit is called curaçaose appel (‘apple from Curaçao’ in Dutch). In Guyana it is called cashew, and in the Dominican Republic a small sub-species of the wax apple is known as cajuilito, (small cashew). In Cuba and Puerto Rico it is known as pumarosa, and in other parts of the Caribbean it is known as corazón.