Lasianthus mucronulatus (Korth.) Miq.

81. Lasianthus mucronulatus (Korth.) Miq. View in CoL

Lasianthus mucronulatus (Korth.) Miq.(1857) 325;(1869) 249. — Mephitidia mucronulata Korth.(1851) 222.—- Type: Korthals s.n. (lecto L, designated here, barcode L0057756 ), Sumatra, Singalang; Korthals s.n. (para, n.v.), Borneo , Balaran , and Pamaton .

Lasianthus palembanicus Miq.(1861) 549. — Lasianthus stercorarius Blume var. palembanicus (Miq.) Miq. (1869) 248. — Type: Teysmann s.n. (holo U), Sumatra, Palembang, Ogan-ulu .

Lasianthus stercorarius Blume var. borneensis Miq. ex Valeton & Winkler (1910) View in CoL 569, syn. nov. — Type: Winkler 2216 (n.v.), Borneo.

Shrubs to treelets; branchlets terete, c. 2 mm diam, puberulous, dark-brown when dry. Leaves: blades oblong-lanceolate, 10 –12 by 2–4 cm, chartaceous, glabrous or sparsely pubescent hairs on midrib above, pubescent hairs on venation beneath, apex caudate-acuminate or acuminate, margin slightly undulate and reflexed, base broadly cuneate to subrounded, slightly asymmetric, midrib and nerves slightly prominent on both surfaces, nerves slender, 10–16 pairs, ascending at an angle of 45–60°, curved to the margin; nervules distinct on both surfaces, reticulate; petioles 2–4 mm long, puberulous. Stipules triangular, usually 2 mm long, puberulous. Cymes sessile; bracts absent. Flowers sessile; obconic-campanulate; calyx tube c. 0.8 mm long, glabrous or pubescent, calyx limb c. 0.6 mm long, with 4–5 minute and pubescent teeth; corolla pubescent outside, tube c. 2 mm long, lobes c. 1 mm long. Drupes globose, c. 3 mm diam, puberulous or subglabrous; pyrenes 5.

Distribution — Indonesia (Sumatra, Java, Kalimantan).

Notes — This species differs from L. stercorarius by having usually relatively large chartaceous leaves with broadly cuneate to subrounded bases and more than 10 paired nerves and small, 2 mm long, triangular stipules and smaller drupes without a truncate calyx limb.

Lasianthus mucronulatus var. lineata was established on Korthals’s Sumatra specimens. It has triangular stipules with swollen base, subcoriaceous leaves with much acute base which are the same as L. stercorarius . Var. lineata here is reduced to L. stercorarius .

Lasianthus stercorarius var. borneensis is the same as L. mucronulatus morphologically as pointed by Valeton & Winkler. It is here reduced to a synonym of L. mucronulatus .