Lasianthus nervosus King & Gamble

83. Lasianthus nervosus King & Gamble View in CoL

Lasianthus nervosus King & Gamble (1904) View in CoL 129;Ridl.(1923a) 163;K.M. Wong (1989) 367. — Type: Scortechini 342 (holo K; iso BM), Peninsular Malay- sia, Perak.

Shrubs to treelets, 1–2 m high; branchlets terete, 1.5 – 2 mm diam, densely tomentose. Leaves: blades oblong to oblong-lanceolate, 2.5 – 5 by 1– 2 cm, coriaceous, glabrous and nitid above, densely tomentose beneath, especially on venation, apex acute, mucronate, margin reflexed, base broadly cuneate to subrounded, midrib depressed above, strongly prominent beneath, nerves flat above, strongly prominent beneath, 6– 8 pairs, ascending at an angle of over 50°, curved to the margin, nervules distinct above, prominent beneath, parallel; petioles 3 – 5 mm long, densely tomentose. Stipules subulate, c. 1 mm long, densely tomentose. Cymes sessile; bracts absent. Flowers sessile; calyx campanulate, c. 2 mm long, densely tomentose, lobes 4, triangular, c. 0.6 mm long; corolla c. 4 mm long, tomentose outside, lobes 4. Drupes globose, sparsely hairy, c. 4 mm diam; pyrenes 4.

Distribution — Peninsular Malaysia, Indonesia (Sumatra, Kalimantan).

Notes — This species has densely tomentose hairs on branchlets and leaf midrib and nerves beneath; leaves oblong, 2.5– 5 by 1– 2 cm with acute and mucronate apex and abruptly acute base, midrib depressed and nerves flat above, midrib and nerves strongly prominent beneath; cymes sessile, absent; flowers 4-merous; calyx tomentose with 4 triangular teeth; drupes globose with 4 pyrenes.

This species differs from L. myrtifolius by having densely tomentose hairs on branchlets and leaf midrib and nerves beneath; leaves oblong, nerves flat above; dupes globose without conspicuous ridges. Lasianthus myrtifolius has branchlets thinly puberulous or subglabrous; leaves ovate-lanceolate, thinly puberulous or glabrous beneath, with caudate-acuminate apex; nerves conspicuously prominent above; dupes with conspicuous 4 ridges.