Lasianthus barbiger Ridl.

9. Lasianthus barbiger Ridl. View in CoL

Lasianthus barbiger Ridl. (1917b) 52. — Type: Robinson & Kloss s.n. (holo BM; iso K), Sumatra, Korinchi .

Shrubs, up to 3 m high; branchlets usually compressed, 2– 3 mm diam, hirsute. Leaves: blades ovate-elliptic, 9 –13 by 3.5 –5 cm, subcoriaceous, sparsely hirsute on midrib and nerves both sides, apex shortly caudate or cuspidate, base cuneate, midrib and nerves slightly depressed above, prominent beneath, nerves 10–11 pairs, ascending at an angle of c. 70°, curved to the margin, nerves prominent and sparsely hirsute beneath, subreticulate; petioles c. 1 cm long, hirsute. Stipules 0.5 –1 cm long, lanceolate-oblong to ovate-oblong, membranaceous, with a broad base and an obtuse apex, sparsely hirsute. Cymes sessile; bracts inconspicuous. Flowers sessile, 4-merous; ca- lyx tubular, with a campanulate limb, calyx tube c. 2 mm long, glabrous, calyx limb with 4 lanceolate c. 1.5 mm long lobes, barbate at margin; corollas unknown. Drupes ovoid, 5 by 8 mm, narrow at base, with 4 obtuse ridges, crowned by persistent calyx lobes, glabrous; pyrenes 4, verrucose on the abaxial face.

Distribution — Endemic to Sumatra.

Note — This species has large membranaceous stipules similar to those of the closely related species L. pseudo­stipularis and L. stipularis . It differs from L. pseudo­stipularis by having hirsute branchlets, ovate-elliptic leaves with hirsute nerves beneath, calyx lobes lanceolate, barbate at margin. It differs from L. stipularis by having hirsute branchlets, ovate-elliptic leaves with hirsute nerves beneath, inconspicuous bracts, calyx lobes lanceolate, barbate at margin.