Syzygium kosteri Craven & Damas, 2021

20. Syzygium kosteri Craven & Damas View in CoL , sp. nov. — Fig. 2 View Fig : 1.6; Map 6

From Syzygium hartleyi Craven & Damas it differs in having the calyx reduced to a rim c. 0.5 mm long and lobes not evident (5 lobes evident and calyx 0.3‒0.5 mm long in S. hartleyi ); c. 110 stamens (60‒65 in S. hartleyi ); ovules numerous per locule and arranged irregularly (ovules 2‒5 per locule in S. hartleyi and arranged irregularly when 5 or regularly in one row when 4). — Type: BW (Koster) 1075 (holo CANB!; iso L, MAN, both n.v.), Indonesia, Papua Province, Numfoor Island, Namber, alt. c. 10 m, 2 Oct. 1954.

Etymology. The specific epithet honours Christiaan Koster (1922‒2000), who moved from Java to Netherlands New Guinea in 1950. From 1951, he was employed by the Netherlands New Guinea forest service, largely as a plant collector.

Tree. Vegetative branchlet terete, c. 2 mm diam; bark dull, smooth, not glandular-verrucose, peeling. Leaf lamina elliptic, ovate, or sometimes obovate, 6.6‒10.5 by 2.5‒5.4 cm, 1.9‒2.6 times as long as wide; base cuneate; apex long acuminate; acumen flat; margin flat; thinly coriaceous; primary and secondary venation generally similar with all or nearly all secondaries joining the intramarginal vein; primary veins 30‒35 on each side of the midrib, in median part of lamina at a divergence angle of 60‒70° and 2‒4 mm apart; intramarginal vein present, weakly arched, c. 0.5 mm from margin; secondary intramarginal vein absent. Petiole 5‒8 mm long. Reproductive seasonal growth unit with a reproductive zone only. Inflorescence leafless, perhaps cauline, paniculate, up to 22 by 15 cm, major axis c. 2.5 mm thick at the midpoint, bark furfuraceous; bracts caducous; bracteoles subtending lateral flowers of a triad but with the terminal flower ebracteolate, caducous. Flower buds with the apex rounded to obtuse. Flowers yellowish. Hypanthium glossy, not visibly gland-dotted, ribbed and minutely (but distinctly) wrinkled; stipitate; stipitate-cup-shaped or goblet-shaped, 3‒3.5 by 2.5 mm, stipe c. 0.5‒0.75 mm long. Calyx is a rim of tissue c. 0.5 mm long. Petals calyptrate (coherent and falling as a cap or at least partly connate (outer petal free, the others connate)). Staminal disc flat ( Fig. 2 View Fig : 1.6). Stamens c. 110, 2.5‒5 mm long. Style c. 2.3 mm long. Placentation axile-median; placenta a flattened cushion. Ovules numerous, ascending, arranged irregularly. Fruit not seen.

Distribution — Indonesia (Aru Islands, Papua Province).

Habitat & Ecology — Old secondary forest, coral limestone. Altitude 0‒10 m.