Dimorphocalyx ixoroides (C.B.Rob.) Airy Shaw

3. Dimorphocalyx ixoroides (C.B.Rob.) Airy Shaw View in CoL — Map 3

Dimorphocalyx ixoroides (C.B.Rob.) Airy Shaw (1967) View in CoL 412;(1983) 20. — Ostodes ixoroides C.B.Rob. (1911) View in CoL 332; Pax & K.Hoffm. (1914) 403; Merr. (1923) 454. — Type: FB (Klemme) 13426 (holo PNH†; iso US), Philippines, Luzon, Province of Ilocos Norte, Bangui .

Small trees, to 6 m high, dbh to 18 cm; flowering branches 1–3 mm thick, round to somewhat angled, brownish, striate. Indumentum mainly absent. Outer bark brownish or greyish, striate, c. 0.5 mm thick; inner bark light brownish; sapwood c. 0.5 mm thick; heartwood c. 1 cm thick. Stipules triangular, 1.7–3 by 1–1.2 mm, glabrous to slightly hairy outside, late caducous. Leaves: petiole 2–8 mm long, 1.2–3.2 mm diam, round, completely pulvinate, glabrous; blade narrowly ovate, widest near the base, 8.5–26 by 2–8.7 cm, 3–6 times as long as wide, base emarginate to cordate, margin serrulate, flat, with glands abaxially in the teeth, apex gradually, indistinctly cuspidate, venation slightly raised on both sides, secondary veins 15– 20 pairs, with intercalary nerves present, tertiary and higher order nerves reticulate. Staminate inflorescences thyrsoid, to 15 cm long, slightly paniculate with few, short side-branches, round, glabrous, green; staminate flowers in cymose groups along side branches, pistillate inflorescences racemose, up to 11.5 cm long with a single flower per node; bracts varying between broad and ovate, c. 0.8 by 1 mm, to narrow and elliptic, c. 0.9 by 0.4 mm, hairy outside, especially the margin. Staminate flowers seen in bud, 3.2–7 mm diam; bud of 3.2 mm diam described: pedicel c. 2 mm long above abscission zone, round, glabrous; calyx c. 3.2 mm high, glabrous to slightly hairy, especially the margin, lobes ovate, c. 2 by 1.8 mm, margin membranous, apices round, without subapical glands outside; petals free, broadly obovate, c. 2.7 by 1.8 mm ( Robinson 1911: c. 6 mm long), glabrous, apex round; disc glands triangular, 0.3–0.6 by c. 0.5 mm, glabrous; stamens c. 10, filaments strap-like, apically narrowed, outer ones 4, free, c. 1 mm long, inner 6 partly united in a c. 1 mm high androphore, free part c. 0.8 mm long, anthers to 1 mm long. Pistillate flowers c. 4 mm diam, pedicel c. 3 mm long above abscission zone, round, glabrous; sepals connate at base, lobes elliptic, c. 4.5 by 3 mm, glabrous, without subapical glands outside; petals ovate, c. 5 by 2 mm, glabrous; disc a flat ring, glabrous; ovary c. 2.5 by 2 mm, glabrous, stigmas c. 0.25 mm long. Fruits 1.6–1.8 by 1.3–1.5 cm, smooth, glabrous; sepals enlarged to 1 by 0.5 cm; pedicel c. 9

Map 3 Distribution of Dimorphocalyx ixoroides (C.B.Rob.) Airy Shaw ( «) and D. muricatus (Hook.f.) Airy Shaw ( l).

mm long; wall woody, c. 0.5 mm thick; columella c. 8 mm long. Seeds c. 8 by 6 mm.

Distribution — Philippines (endemic on Luzon).

Habitat & Ecology — On slopes in forest.Altitude: c. 435 m. Flowering: January, February, May, June, October, November; fruiting: January to March, May, June, December.