Changes

<big>''[[Syzygium aqueum]]'' (Burm.f.) Alston</big>, <big>''[[Syzygium malaccense]]'' (L.) Merr. & Perry</big>, <big>''[[Syzygium samarangense]]'' (Blume) Merr. & Perry</big>

:Protologue: *''S. aqueum'' : Ann. Roy. Bot. Gard. Peradeniya 11: 204 (1929).

*''S. malaccense'' : J. Arnold Arbor. 19: 215 (1938).

*''S. samarangense'' : J. Arnold Arbor. 19: 115, 216 (1938).

* ''S. aqueum'' : *''Eugenia aquea'' Burm.f. (1768), *''Eugenia javanica'' Lamk (1789) pro parte, *''Eugenia mindanaensis'' C.B. Robinson (1909).

* ''S. malaccense'' : *''Eugenia malaccensis'' L. (1753), *''Jambosa malaccensis'' (L.) DC. (1828), *''Eugenia domestica'' Baillon (1876).

* ''S. samarangense'' : *''Eugenia javanica'' Lamk (1789) pro parte, *''Myrtus samarangensis'' Blume (1826), *''Eugenia mananquil'' Blanco (1845), *''Jambosa alba'' Blume (1850).

* * ''S. aqueum'' : *water apple, bell fruit (En). *Indonesia, Malaysia: jambu air, jambu air mawar

* ''S. malaccense'' : *Malay apple, pomerac (En). *Pomme malac, poirier de Malaque (Fr)

* ''S. samarangense'' : *wax jambu, Java apple (En)

Eighty per cent or more of the fruit is edible. The composition of all 3 species is similar per 100 g edible portion: water more than 90%, protein 0.3 g, fat none, carbohydrates 3.9 g, fibre 1 g, vitamin A 253 IU, vitamin B₁and B₂traces, vitamin C 0.1 mg, energy value 80 kJ/100 g (analysis for wax jambu in Thailand). In all 3 species some plant parts are astringent because of the presence of tannins.

* ''S. aqueum'' . *Tree, 3-10 m tall, with short and crooked trunk, 30-50 cm diameter, often branched near the base and with irregular canopy. *Leaves opposite, elliptic-cordate to obovate-oblong, 7-25 cm × 2.5-16 cm, not or slightly aromatic when bruised; petiole 0.5-1.5 mm long. *Inflorescences terminal and axillary, 3-7-flowered; flowers .*Flowers 2.5-3.5 cm in diameter; calyx tube 5-7 mm long; petals 4, spathulate, up to 7 mm long, yellow-white; stamens 0.75-2 cm long, numerous; style up to 17 mm long. *Fruit a berry, turbinate, 1.5-2 cm × 2.5-3.5 cm, crowned by the fleshy calyx segments, white to red, glossy; flesh very juicy, watery, hardly aromatic. *Seeds 1-2(-6), rounded, small.

* ''S. malaccense'' . *Tree, 5-20 m tall, with straight trunk, 20-45 cm diameter, often branched near the base and with broadly ovoid canopy. *Leaves opposite, elliptic-oblong, 15-38 cm × 7-20 cm, thick-coriaceous, petiole 0.5-1.5 cm long, thick, red when young. *Inflorescences exclusively on defoliate twig-parts, short and dense, 1-12-flowered; flowers .*Flowers 5-7 cm in diameter, red; calyx tube ventricose towards apex, 1.5-2 cm long, with broad lobes 4-8 mm long; petals 4, oblong-ovate or orbicular-ovate, up to 2 cm long, dark red; stamens numerous, up to 3.5 cm long, with red filaments; style 3-4.5 cm long, red. *Fruit a berry, ellipsoid, 5-8 cm in diameter, crowned by the incurved non-fleshy calyx segments, dark red or purplish-yellow or yellow-white; flesh 0.5-2.5 cm thick, juicy, white, fragrant. *Seed 1 per fruit, globose, 2.5-3.5 cm in diameter, brown.

* ''S. samarangense'' . *Tree, 5-15 m tall, with short and crooked trunk, 25-50 cm diameter, often branched near the base and with wide, irregular canopy. *Leaves opposite, elliptic to elliptic-oblong, 10-25 cm × 5-12 cm, coriaceous with thin margin, pellucid dotted, rather strongly aromatic when bruised; petiole thick, 3-5 mm long. *Inflorescences terminal and in axils of fallen leaves, 3-30-flowered; flowers .*Flowers 3-4 cm in diameter, calyx tube ca. 1.5 cm long, ventricose at apex, lobes 3-5 mm long; petals 4, orbicular to spathulate, 10-15 mm long, yellow-white; stamens numerous, up to 3 cm long; style up to 3 cm long. *Fruit a berry, broadly pyriform, crowned by the fleshy calyx with incurved lobes, 3.5-5.5 cm × 4.5-5.5 cm, light red to white; flesh white spongy, juicy, aromatic, sweet-sour in taste. *Seeds 0-2, mostly suppressed, globose, up to 8 mm in diameter.

Propagation from seed is common. Seeds are sometimes abortive, and some wax jambus tend to be seedless. Clonal propagation through air layers, cuttings or budding is not difficult. Air layering is commonly employed in South-East Asia. The modified Forkert method is recommended for budding. Seedlings of the same or other ''Syzygium'' species are used as rootstocks. In Java "jambu klampok" or "kopo" ( ''S. pycnanthum'' Merr. & Perry, syn. ''Eugenia densiflora'' (Blume) Duthie) is recommended as rootstock because it is hardy and not attacked by termites.