Lasianthus perakensis var. perakensis

Zhu, H., Roos, M. C. & Ridsdale, C. E., 2012, A taxonomic revision of the Malesian species of Lasianthus (Rubiaceae), Blumea 57 (1), pp. 1-102 : 73

a. var. perakensis

Lasianthus perakensis King & Gamble (1904) 126; Ridl. (1923a) 160; K.M. Wong (1989) 372 (excl. syn. L. flavinervius Ridl. ); H. Zhu (2001b) 139. —

Type: Wray 4128 ( lecto SING, designated by Wong 1989) . Paratypes: King’s collector 682 (n.v.), 2438 (n.v.), 2838 (n.v.), 10210 (n.v.), Peninsular Malaysia, Perak .

Shrubs; branches terete, robust, c. 3 mm diam, or slightly compressed in the youngest part, minutely rusty-puberulous. Leaves: blades elliptic or obovate-elliptic, 15 – 25 by 5.5– 8 cm, subcoriaceous, glabrous above, puberulous on midrib and nerves beneath, apex cuspidate or caudate, base cuneate; midrib slightly depressed above, prominent beneath, nerves 7– 8 pairs, flat above, prominent beneath, nervules subparallel, conspicuous on both sides; petioles about 1 cm long, rusty-puberulous. Stipules triangular, acute, up to 5 mm long, rusty-puberulous. Cymes sessile, bracts absent. Flowers sessile, crowned; calyx campanulate, c. 2 mm long, much tapered to the base, mouth wide, truncate, with 5 indistinct blunt spreading segments, pubescent; corolla short, 3 mm long, lobes ovate-triangular, 1.5 mm long, pubescent; ovary 5-celled. Drupes hemispheric, c. 4 mm diam, subglabrous or sparsely puberulous, 10-ribbed, crowned by the calyx limb; pyrenes 10.

Distribution — S Thailand, Malaysia (Peninsular, Sabah) and Indonesia ( Sumatra, Kalimantan).

Note — Lasianthus perakensis has a wide to slightly trumpet-shaped calyx limb with 5 indistinct blunt spreading lobes, drupes hemispheric with 10 obtuse ridges and crowned by blunt calyx lobes, pyrenes 5.