Dehaasia sumatrana Kosterm.

Fijridiyanto, I. A., Smets, E. & Arifiani, D., 2020, Taxonomic revision of Dehaasia (Lauraceae) in Sumatra, Blumea 65 (2), pp. 167-175 : 173

6. Dehaasia sumatrana Kosterm. — Map 2

Dehaasia sumatrana Kosterm. (1973) 470. — Type: Boschproefstation E.1077 (holo BO.1273069; iso L.1797944), [ Indonesia,] Sumatra, Bengkoelen, Redjang, Tjoeroep .

Trees, 6–22 m tall, stem 12–34 cm diam; bark thin, peeling, with lenticels, inner bark brown; sapwood yellow; twigs sympodial, thick, glabrous, rough, with protruding lenticels and leaf scars; terminal leaf buds glabrescent; cataphylls broadly ovate, apices cuspidate to caudate, inner side glabrous, margin ciliate. Leaves spirally arranged at the end of twigs; lamina stiffly chartaceous, obovate to elliptic, 10–30 by 3.7–10 cm, apex obtuse to acuminate, base cuneate, glabrous on both surfaces, rather glossy above, rough and glaucous below, midrib impressed to flat above, raised below, secondary veins 8–11(–14) pairs, curving and joining near the margin, impressed to flat above, raised below, tertiary veins reticulate, inconspicuous above, prominent below. Petioles 25–40 mm long, 2–3 mm diam, glabrous, adaxial side flat, thicker and rough in the proximal half of the base because of protruding lenticels. Inflorescences subterminal, paniculate with the ultimate flowers of each branch pseudo-umbellate, 8–22 cm long; rachis slender, glabrous, purplish pink. Flowers: tepals subequal, glabrous except for the ciliate margin; outer tepals broadly ovate, 1.2–1.5 by c. 1.1 mm, apex acute to broadly acute; inner tepals broadly ovate, c. 1.5 by 1.5 mm, apices broadly acute; receptacle tubes deep; pedicel filiform, 0.4–2 cm long, greenish white. Stamens 0.8–1.2 mm long, anthers rounded to truncate or slightly emarginate at the apex with minute unicellular hairs; filaments as long as anthers or slightly shorter, pubescent, filaments of the third whorl with two sessile glands each. Staminodes ovoid to broadly ovoid, 0.4–0.6 by 0.2–0.5 mm, inner face glabrous, outer face villose along the central part. Pistil c. 1.4 mm long; ovary globose, c. 0.6 by 0.8 mm, glabrous; style terete, glabrous, c. 0.8 by 0.1 mm; stigma triangular. Infructescences c. 14 cm long. Fruit subglobose, 3–4 cm wide, glossy (purple-)black; stalk swollen, c. 3 cm long, fleshy, warty, bright red when fresh.

Distribution — Payakumbuh, Aceh, Bengkulu. This species is endemic to Sumatra.

Ecology — Primary, secondary and disturbed forest, at 10– 1100 m altitude. Flowering: January to June; fruiting: August.

Vernacular names — Medang jambu, medang kuning, medang sangka.

Note — This species is easily recognized among the other Dehaasia species of Sumatra by its long filiform pedicels, petioles rough and thick in the basal half, and the prominently reticulate lower leaf surface.