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Java plum

syzygium

Habit Trees or shrubs 6–20+ m; twigs weakly compressed; bark white, smooth. Trees or shrubs, mostly glabrous.
Leaves

blade drying concolorous olive or tan, ovate, elliptic, or oblong, 8–17 × 3.5–7 cm, leathery, base cuneate, obtuse, or rounded, apex acuminate or obtuse, tip bluntly acute, surfaces glandular, glossy adaxially, glands small, often punctiform, numerous, sometimes more so abaxially.

opposite;

blade venation brochidodromous.

Inflorescences

15–100-flowered, axillary, panicles of dichasia, 1–3 times compound;

axis 15–60 mm, lateral branches 5–20 mm, axis and branches compressed, glandular;

bracts and bracteoles caducous.

(1 or)2–100-flowered, terminal or axillary, dichasia, panicles, or racemes.

Flowers

sessile at tips of lateral branches;

bud pyriform, 4–5 mm;

hypanthium obconic to narrowly campanulate, 3–5 mm;

calyx lobes caducous, leaving round crateriform scar at ovary summit, equal, 0.5 × 0.5 mm;

petals coherent, forming a calyptra, falling as a unit at anthesis;

stamens 50–100, 3–5 mm;

style 6–7 mm.

[3 or]4(or 5)-merous, sessile or pedicellate;

bud turbinate, clavate, or obovoid;

hypanthium forming a tube, prolonged well beyond summit of ovary, base often attenuate;

calyx lobes usually distinct and well developed, in opposing subequal to equal pairs, rarely calyptrate and circumscissile at anthesis;

petals white, distinct or coherent and calyptrate and falling as a unit at anthesis;

stamens 50–300[–500], borne in a ring surmounting hypanthium;

ovary 2(–4)-locular;

style often persistent in developing fruit;

ovules 2–90.

Fruits

berries, red, purple, purple-black, yellow, or reddish, globose, ellipsoid, or subglobose, usually excavated apically;

calyx lobes persistent or caducous.

Berries

purple black, ellipsoid, 15–20 mm;

calyx tube reduced to persistent, apical ring, 1–2 mm diam. 2n = 22.

Seeds

usually 1[or 2, rarely 3–5], reniform to subglobose;

seed coat membranous;

embryo subglobose to reniform;

cotyledons distinct, plano-convex, thick.

x

= 11.

Syzygium cumini

Syzygium

Phenology Flowering spring, summer.
Habitat Disturbed areas, often near fresh water.
Elevation 0–40 m. (0–100 ft.)
Distribution
from FNA
FL; se Asia (including India) [Introduced in North America; introduced also elsewhere in tropics]
[BONAP county map]
from USDA
s Asia; se Asia; Africa; Pacific Islands (New Guinea); Australia [Introduced in North America]
[BONAP county map]
Discussion

Syzygium cumini is known in the flora area from the central and southern peninsula.

Pimenta dioica has become established near Miami, Florida, and is perhaps most similar to Syzygium cumini. Of the berry fruited species, only these two have many-flowered panicles. Pimenta dioica is most easily distinguished from S. cumini by having pubescent (versus glabrous) flowering hypanthia, leaves with 10–15 prominent lateral veins (versus numerous weak lateral veins), embryos with a hypocotyl much longer than the cotyledons, and leaves with a strong spicy aroma when crushed.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Species ca. 1000 (3 in the flora).

Many species of Syzygium are widely cultivated throughout the tropics as fruit or ornamental trees or as hedges. They are not tolerant of cold. Two species are naturalized in southern Florida and another in southern California.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Key
1. Inflorescences 15–100-flowered, panicles; floral buds 4–5 mm; calyx lobes 0.5 × 0.5 mm, caducous; petals coherent.
S. cumini
1. Inflorescences (1 or) 2–8-flowered, dichasia or racemes; floral buds 6–30 mm; calyx lobes 2–8 × 2–10 mm, persistent; petals distinct.
→ 2
2. Leaf blades obovate or elliptic, 3–9 × 1.2–3.2 cm; petals 3–5 mm diam.; berries 1.4–2.3 cm; California.
S. australe
2. Leaf blades narrowly elliptic or lanceolate, 12–24 × 3–5 cm; petals 10–15 mm diam.; berries 3–4 cm; Florida.
S. jambos
Source FNA vol. 10. FNA vol. 10. Authors: Fred R. Barrie, Leslie R. Landrum.
Parent taxa Myrtaceae > Syzygium Myrtaceae
Sibling taxa
S. australe, S. jambos
Subordinate taxa
S. australe, S. cumini, S. jambos
Synonyms Myrtus cumini, Calyptranthes oneillii, Eugenia cumini, E. jambolana Caryophyllus, Jambosa
Name authority (Linnaeus) Skeels: U.S.D.A. Bur. Pl. Industr. Bull. 248: 25. (1912) P. Browne ex Gaertner: Fruct. Sem. Pl. 1: 166, plate 33, fig. 1. (1788) — name conserved
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