Zygogynum bullatum (Diels) Vink

Vink, W., 2016, The Winteraceae of the Old World. VIII. Some Zygogynum species from New Guinea, Blumea 61 (1), pp. 41-50 : 43

3. Zygogynum bullatum (Diels) Vink — Fig. 2

Zygogynum bullatum (Diels) Vink (1985) 53. — Drimys bullata Diels (1916) 243. — Bubbia bullata (Diels) A.C.Sm. (1942) 426. — Type: Schultze Jena 342 (holo B).

Treelet 2 m high. Branchlets rather stout, brown. Leaves scattered along branchlets; petiole 6–13 mm long, slightly grooved above, rounded below, dark brown; blade elliptic to obovate, 6–14.5 by 2–5 cm, subcoriaceous, strongly bullate between secondary and tertiary nerves, purplish grey below, apex acute to obtuse and up to 6 mm broadly to narrowly rounded-acuminate, base narrowly acute; midrib strongly impressed above, prominent below; secondary nerves at 75–85° with midrib, towards margin joined by a distinct double row of arcs, secondaries and main tertiaries impressed above, prominent below. On lower leaf surface stomata white, dense, leaving only islands of non-white unspecialised cells, not over secondary and tertiary nerves; no or few oil cells visible. Inflorescences with 3–5 partial inflorescences, these 4–7 cm long, with rather thin axes, few-flowered, flowers inserted on axes 2nd order; pedicels 3–10 mm long, slender. Only fruits seen. Calyx 0.5–1 mm long. Carpels 3–4. Fruitlets a hard berry, obovoid to globose, up to 6 mm high; distinct stipe 0.7–1 mm long, stigma apical, 2–4 mm long, outer layer of rather thin fruitwall with small clusters of brachysclereids, pulpa not between seeds. Seeds few, curvedellipsoid, c. 3 by 1.7 by 1.5 mm; testa dull black, subsmooth.

Distribution — PNG, Sepik area, Mt Stolle.

Ecology — Montane mossy forest at 2000 m altitude. Fruiting September.

Specimens examined. PAPUA NEW GUINEA, Sepik (Kaiserin Augusta Flusz) area,without further locality, Schultze Jena 342 ( B); Mt Stolle,trail from summit to Mekil Research Station , Regalado & Katik 1281 ( L), 2000 m alt .

Note — Although the flowers of this species are not known, it is highly distinctive by its medium sized leaves that are strongly bullate between the secondary and main tertiary nerves and have the lower side purplish grey with outstanding dark nervature.

Figures

Fig. 2 Zygogynum bullatum (Diels) Vink (Schultze Jena 342, holotype).