Lasianthus hirtimarginatus H.Zhu, 2012

57. Lasianthus hirtimarginatus H.Zhu View in CoL , sp. nov.

Similis L. angustifolio King & Gamble ,sed ramulis glabris, foliis dense hirsutis ad marginem, nervis 8–11 binatis et petiolis longioribus differt. — Typus: Hotta & Tamin 201 (holo L), W Sumatra, Padang , 1300 m alt., 23 Jan.1981 .

Shrub, 3 m high; branchlets slightly compressed, glabrous, c. 2 mm diam, lenticellate. Leaves: blades lanceolate, 12–17 by 1.5 –2.5 cm, chartaceous, glabrous above, puberulous or glabrescent beneath except pubescent midrib and nerves, apex long caudate, margin densely hirsute, base acute, slightly asymmetric, midrib slightly depressed above, prominent beneath,

Distribution of Lasianthus hirsutus (Roxb.) Merr. (¡) and Miq. (●).

nerves flat above, prominent beneath, 8–11 pairs, ascending at an angle of 70–80°, curved to the margin, nervules obscure above, slightly clear beneath, reticulate, puberulous beneath; petioles 1.2 –1.5 cm long, glabrous. Stipules triangular, c. 2 mm long, hirsute. Inflorescences sessile; bracts inconspicuous. Flowers sessile; calyx pubescent, with 4–5 minutely teeth; co- rolla pubescent. Drupes c. 5 mm diam, warty, irregular ridged, pubescent; pyrenes 4–5.

Distribution — Indonesia (Sumatra).

Habitat & Ecology — In lower montane forests between 1100–1500 m altitude in W Sumatra. Flowering and fruiting between January and August.

Additional specimen examined. W Sumatra,Padang, H. Nagamasu 3140

(L).

Note — This species is similar to L. angustifolius . It differs from the latter by having glabrous branchlets, densely hirsute leaf margin, nerves 8 –11 pairs and longer petioles (1.2–1.5 cm long); while L. angustifolius has pubescent branchlets, glabrous leaf margin, nerves 12–14 pairs and short petioles (4–5 mm long).