Dehaasia tomentosa

Fijridiyanto, I. A., Smets, E. & Arifiani, D., 2020, Taxonomic revision of Dehaasia (Lauraceae) in Sumatra, Blumea 65 (2), pp. 167-175 : 174

8. Dehaasia tomentosa (Blume) Kosterm. – Map 2

Dehaasia tomentosa (Blume) Kosterm. (1973) 473; Kochummen (1989) 141. — Cyanodaphne tomentosa Blume (1851) 334. — Lectotype (first selection by Kostermans 1973, final selection made here): Muller s.n. (lecto L.0036341; isolecto BO not found, L.0036340),Borneo (see note 1).

Trees, 8–14 m tall, stem 10–18 cm diam; bark grey, smooth; sapwood yellow or light brown, rather soft, with a smell like cedar-wood; twigs sympodial, terete, whitish, glabrous to sparsely hairy, densely hairy at the tip, with prominent lenticels and leaf scars; terminal leaf buds densely hairy. Leaves spirally arranged at the end of twigs; lamina coriaceous, elliptic or obovate to broadly obovate (narrowly obovate), 4–22.5 by 2–13 cm, glabrous above, with sparse minute appressed light brown hairs below, apex rounded or acuminate (shortly acuminate), base cuneate, midrib impressed with sparse light brown hairs above, raised below, secondary veins 8–10(–12) pairs, curving and joining near margin, more or less impressed above, raised below,tertiary veins scalariform-reticulate,inconspicuous above, conspicuous below. Petioles 3–15 mm long, 1–3 mm diam, sparsely to densely minute light brown hairy, channelled but rounded at the base. Inflorescences subterminal and axillary, paniculate-cymose, up to 12 cm long, tomentose; bracteoles caducous. Flowers pale green or white, fragrant; tepals subequal, tomentose, margin ciliate; outer tepals erect, ovate to broadly ovate, 1.1–1.3 by 0.8–1.4 mm, apex broadly acute; inner tepals broadly ovate, 1.2–1.5 by 1.2–1.7 mm, apex broadly acute; receptacle shallow; pedicel stout, c. 1.2 mm long. Stamens 0.6–0.8 mm long; anthers rounded to truncate (or slightly emarginate) at apex; filaments slightly longer than anthers, densely curly brown hairy; filaments of the third whorl with two sessile glands each. Staminodes broadly ovoid, thick, 0.6–0.7 by 0.4–0.5 mm, half of outer side curly brown hairy, inner side glabrous. Pistil 1.2–1.4 mm long; ovary globose, 0.6–0.8 by 0.7–0.9 mm, glabrous; style terete, glabrous, 0.4–0.7 by c. 0.1 mm; stigma bilobed. Infructescences 9–13.5 cm long, sparsely tomentose. Fruit oblong, 1.8–2.3 by 0.9–1 cm; stalk distinctly swollen, 1.3–2.3 cm long, fleshy and warty, red when fresh.

Distribution — Malay Peninsula, Sumatra (West coast Lampung, Bangka Island and Belitung Island), Borneo.

Habitat & Ecology — Common, on sandy soil, at 20–1000 m altitude. Flowering: September to January.

Vernacular names — Medang kumbang, medang putih, medang sang, medang talur.

Notes — 1. In the protologue, no type specimen of this species was mentioned by Blume (1851). Later, when Kostermans (1973) treated this species as a new combination, he wrote: “Typus: Mueller s.n, Borneo, ster, ( BO, L)”, but he did not select the specimens, nor did he indicate which specimen was the lectotype or isolectotype.

2. This species is similar to Dehaasia cuneata . The latter has minute outer tepals and deeper receptacle tubes. One specimen of D. tomentosa from relatively high altitude (1000 m) at West Coast of Sumatra has narrowly obovate leaves.