Dehaasia bandaharense Fijrid., 2020

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

1. Dehaasia bandaharense Fijrid. , sp. nov. — Fig. 1 ; Map 1

Dehaasia bandaharense differs from D. corynantha Kosterm. in smaller lamina (shorter than 12 cm vs up to 25 cm long) with a cuneate (vs acute) base. The inflorescence is longer (up to 10 cm vs up to 7 cm long). The staminodes are with two separate apical-lateral glands (vs awl-shaped with no glands). — Type: W. J. J. O. de Wilde & B. E. E de Wilde-Duyfjes 15557 (holo L.1797857;iso MO [Van der Werff,pers.comm.]),[ Indonesia], Sumatra, Aceh, Gunung Leuser Nature Reserve, Gunung Bandahara, 20 Mar. 1975. Paratype: W. J. J. O. de Wilde & B. E. E de Wilde-Duyfjes 15572 ( L), Indonesia, Sumatra, Aceh, Gunung Leuser Nature Reserve , Gunung Bandahara .

Trees, 20–30 m tall, stem up to 40 cm diam, wood yellowish; twigs slender to thick, 2–7 mm diam, cracked and easily peeling off when dried; terminal buds glabrous, cataphylls ciliate. Leaves spirally arranged near the end of twigs; lamina coriaceous, elliptic to subobovate, 6–11 by 3–4.7 cm, apex short acuminate, base cuneate, glabrous on both sides, midrib flat above, raised below, secondary veins 8–10 pairs, raised to flat above, raised and joining near the margin below, tertiary veins reticulate, conspicuous above, prominent below. Petioles 8–16 mm long, 0.5–1 mm diam, glabrous, channelled above towards the base. Inflorescences subterminal and axillary, paniculate-cymose, up to 10 cm long; rachis filiform, with sparse to dense minute appressed light brown hairs. Flower buds grey-green tepals unequal; outer tepals ovate, c. 1.6 by 1.2 mm, with minute light brown appressed hairs, margin ciliate; inner tepals broadly ovate, c. 2 by 1.8 mm, apices broadly acute, with minute light brown appressed hairs, margin ciliate; receptacle shallow, pedicel c. 3.7 mm long. Stamens 1.3–1.7 mm long, anthers rounded to truncate or slightly emarginate at apex; filaments longer than anthers, pubescent, filaments of the third whorl with two sessile glands each. Staminodes with two separate apical-lateral glands, filament c. 0.7 mm long, pubescent. Pistil c. 2 mm long;ovary ovoid,c.1.2 by 0.7 mm,glabrous;style terete,c. 0.8 mm long, glabrous; stigma triangular. Fruit not seen.

Distribution — Aceh.

Habitat & Ecology — Mountain rainforest, at 800–1000 m altitude. Flowering in March.

Note — This species is similar to the Bornean species D. corynantha Kosterm. ; which has bigger leaves (up to 25 cm long) with impressed secondary veins above and an ellipsoid ovary as long as the style.

Figures

Fig. 1 Dehaasia bandaharense Fijrid. a. Flowering leafy twig; b, c. flower buds; d, e. outer and inner tepals; f. first whorl stamen; g. second whorl stamen; h. third whorl stamen with a pair of glands; i. staminode; j. ovary (all: W.J.J.O. de Wilde & B.E.E. de Wilde-Duyfjes 15557, L). — Drawing by Esmée Winkel.