Dehaasia pilosa Fijrid., 2020

Fijridiyanto, I. A., Smets, E. & Arifiani, D., 2020, Taxonomic revision of Dehaasia (Lauraceae) in Sumatra, Blumea 65 (2), pp. 167-175 : 171-173

5. Dehaasia pilosa Fijrid. , sp. nov. — Fig. 2 ; Map 2

Dehaasia pilosa differs from D. brachybotrys (Merr.) Kosterm. in smaller lamina (shorter than 23 cm vs up to 40 cm long) with the base cuneate to obtuse (vs acute);the secondary veins on lower leaf surface not all distinctly joining near the margin (vs distinctly joining near margin); the inflorescence generally longer (up to 10 cm vs up to 6 cm long); the ovary hairy (vs glabrous). — Type: Boschproefstation E.1063 (holo L.1797809), [ Indonesia,] Sumatra, Bengkulu, Redjang .

Trees, twigs slender, 2–4 mm diam, greyish, slightly grooved, with inconspicuous lenticels; terminal buds glabrous to glabrescent, cataphylls ciliate. Leaves spirally arranged at end of twigs; lamina chartaceous, elliptic to obovate, 6–22 by 3.5–7 cm, glabrous on both sides, apex subacute to acuminate, base cuneate to obtuse, midrib impressed to flat above, raised below, secondary veins 10–13 pairs, impressed to flat above, raised and not all distinctly joining near margin below, tertiary veins reticulate, inconspicuous above, conspicuous below. Petioles 7–30 mm long, 0.7–1.5 mm diam, glabrous, channelled towards the base. Inflorescences subterminal, paniculate-cymose, up to 10 cm long; rachis filiform, glabrous. Flowers: tepals unequal, outer tepals broadly ovate to rounded, 1.1–1.3 by 1.5–1.8 mm, glabrous to glabrescent, margin ciliate; inner tepals broadly ovate, 1.7–2 by 1.7–1.8 mm, apices broadly acute to obtuse, glabrescent, margin ciliate; receptacle shallow, pedicel c. 3.2 mm long. Stamens 1.3–1.7 mm long; anthers rounded to truncate at apex, slightly wider than filaments; filaments longer than anthers, with short appressed hairs, filaments of the third whorl with two subsessile glands each. Staminodes awl-shaped, c. 0.5 mm long, with short appressed hairs. Pistil c. 2 mm long; ovary ovoid, c. 0.9 by 0.7 mm, hairy; style terete, c. 1.1 mm long, sparsely hairy at base; stigma triangular. Fruit not seen.

Distribution — Bengkulu. This species is only known from the type specimen.

Habitat & Ecology — Growing at c. 1100 m altitude. Flowering: June.

Vernacular name — Medang tanduk.

Note — This species is morphologically almost similar to D. brachybotrys ; the latter has bigger leaves, glabrous ovaries, shorter and hairy inflorescences.

Figures

Fig. 2 Dehaasia pilosa Fijrid. a. Flowering leafy twig; b. flower buds; c, d. inner and outer tepals; e. first whorl stamen; f. second whorl stamen; g. third whorl stamen with a pair of glands; h. staminode; i. ovary (all: Boschproefstation E1063, L). — Drawing by Esmée Winkel.