Zygogynum cyclopensis Vink, 2016

Vink, W., 2016, The Winteraceae of the Old World. VIII. Some Zygogynum species from New Guinea, Blumea 61 (1), pp. 41-50 : 45

6. Zygogynum cyclopensis Vink , sp. nov. — Fig. 1 , 3

Zygogynum cyclopensis Vink. — Type: Van Royen & Sleumer 6396 (holo L; iso A, LAE ).

Small tree 10–13 m high, dbh 15–45 cm. Branchlets rather slender to rather stout, (dark) brown. Leaves scattered along branchlets or only at the end of branchlets; petiole 10–15 mm long, flat to grooved above, rounded below, dark brown to blackish; blade obovate to oblanceolate, (9.5–)15–25 by (3.5–) 5–7 cm, (thick) chartaceous, in sicco below light brown to light grey with a purplish shade; apex acute to retuse or up to 1 cm broadly acuminate, base often with recurved margins and narrowly acute to attenuate; midrib impressed above, prominent below; secondary nerves at 50–70° with midrib, arcingly joined at some distance from margin, distinct above, prominulous below. On lower leaf surface stomata white, solitary or in short strings or small clusters, also over secondary nerves; oil cells scattered or indistinct. Inflorescences with 3–11 partial inflorescences, these 5 –15 cm long, with rather thin to rather stout axes, 7–43-flowered, flowers inserted on axes (1st or) 2nd to 4th order, empty bracts below inflorescence 0–10; pedicels 1–7 mm long, slender, in fruit rather stout. Calyx 2-lobed, reflexed, 0.7–1.3 mm long, thin, smooth. Petals 4, free, elliptic to obovate, cream to yellow, 3–4 by 1.8–2.7 mm, apex broadly rounded. Stamens 10–13, 0.9–1.5 mm long, filaments often inflated; thecae apically separated; connective not prolonged; pollen in tetrads. Carpels 1–4, free, 1.3–1.7 by 0.7–1.3 by 0.7–1.2 mm; stigma usually 2/3 as long as carpel apex and shortly descending adaxially; ovules 16–27. Fruitlets a hard berry, (obovoid-)globose, green or greenish yellow, 9–12 mm long; base rounded, with 1– 2 mm long distinct stipe; fruitwall with clusters of brachysclereids; pulpa weakly developed. Seeds c. 9–12, obovoid, straight to slightly curved, 3.8–4.5 by 2.0–2.3 by 1.6–2.0 mm; testa rather firm, smooth, nitidous, grey to black.

Distribution — Papua, Cyclops Mts, and PNG,Angorum Subprovince.

Ecology — Rainforest along creek or lowland swamp forest at 300–510 m altitude.

Specimens examined. INDONESIA, Papua, Kab. Jayawijaya, Cyclops Mts, Westerhuis BW 5429 (A, BO,CANB,L, LAE,PNH ), 510 m alt.; Van Royen & Sleumer 6328 (A, L, LAE ), 6396 (A, L, LAE ), 450 m alt. – PAPUA NEW GUINEA, East Sepik Prov.,Angoram Subprov., Wogupmeri R., Latoma village, Leach NGF 34348 (A, L), 305 m alt.

Figures

Fig. 1 Carpels, all with ventral side to the left, and at the same magnification. – a. Zygogynum archboldianum; b. Z. bosavicum; c. Z. clemensiae; d. Z. cruminatum; e. Z. cyclopensis; f. Z. ledermannii; g, g'. Z. longifolium; j. Z. megacarpum; h. Z. montanum; i. Z. oligocarpum; k, k'. Z. polyneurum; l. Z. schramii; m. Z. sororium; n. Z. staufferianum; o. Z. umbellatum (a. Brass 12712; b. LAE 58822; c. Clemens 4596; d. LAE 69143; e. Royen & Sleumer 6396; f. Takeuchi 6212; g. Vink BW 8413; g'. Robbins 2004; j. Burley & Ismail 4618; h. LAE 61131; i. Schlechter 16470; k, k'. Jacobs 9489; l. Vink BW 8458; m. Ledermann 11898; n. Balgooy 968; o. Boden Kloss s.n.).

Fig. 3 a.Zygogynum cyclopensis Vink.Seed, lateral. — b, c. Z.longifolium (A.C.Sm.) Vink.Seed from lateral and abaxial sides resp.(a:Van Royen & Sleumer 6396; b, c: Takeuchi 11084).