Dehaasia caesia

Fijridiyanto, I. A., Smets, E. & Arifiani, D., 2020, Taxonomic revision of Dehaasia (Lauraceae) in Sumatra, Blumea 65 (2), pp. 167-175 : 169-171

2. Dehaasia caesia Blume — Map 1

Dehaasia caesia Blume (1851) 333; Backer & Bakh. f. (1963) 131; Kosterm. (1964) 467; (1973) 429. — Lectotype (designated by Kostermans 1973): Hasskarl 345 (lecto L.0036308), [ Indonesia,] Java.

Trees, up to 25 m tall, stem up to 20 cm diam; twigs sympodial, terete, 4 –7 mm diam, glabrous, lenticels inconspicuous, terminal bud with sparse minute appressed brown hairs. Leaves spirally arranged, clustered at the end of branches; lamina coriaceous, obovate to elliptic, 4.5–15 by 2–6 cm, apex acuminate, base cuneate (rarely obtuse), lamina glabrous on both sides, greyish below, midrib impressed to flat above, raised below, secondary veins 8–11 pairs, flat to raised above, raised below, curving and joining near leaf margin, tertiary veins reticulate, conspicuous above, inconspicuous below. Petioles 10–20 mm long, 1–2 mm diam, glabrous, channelled above. Inflorescences subterminal and axillary, paniculate-cymose, 4–12 cm long; rachis filiform, with sparse to dense minute appressed brown hairs. Flowers: tepals equal or nearly so, with minute brown appressed hairs; outer tepals ovate, 0.7–1.1 by 0.7–1.1 mm, apex broadly acute, margin ciliate; inner tepals ovate, 1–1.1 by 0.9–1.1 mm, apex broadly acute, margin ciliate; receptacle deeply tubular; pedicel 1.5–2.5 mm long. Stamens 0.6–0.8 mm long, anthers truncate at apex; filaments as long as or slightly longer than anthers, pubescent, filaments of the third whorl with two sessile glands each. Staminodes awl-shaped, 0.4–0.5 mm long, pubescent. Pistil 1–1.4 mm long; ovary globose, 0.5–0.7 mm diam, glabrous; style terete, 0.5–0.7 mm long, glabrous; stigma capitate. Infructescences 4–8.5 cm long, glabrescent. Fruit ellipsoid, 2–2.1 by 1.1–1.4 cm; stalk swollen, 0.6–1 cm long, fleshy and warty.

Distribution — Palembang, Bangka Island, Bengkulu and Lampung.

Habitat & Ecology — Growing at 5–900 m altitude. Flowering: February.

Vernacular Names — Medang batu,medang tanduk,medang tungkai.

Map 1 Distribution of Dehaasia bandaharense Fijrid. (●), D. caesia Blume (■), D. cuneata (Blume) Blume (▲) and D. incrassata (Jack) Kosterm. (*) in Sumatra.

Note — Dehaasia caesia differs from the other Dehaasia species of Sumatra by its subequal tepals and a capitate stigma.