Lasianthus borneensis Merr.

12. Lasianthus borneensis Merr. View in CoL

Lasianthus borneensis Merr. (1929a) 292. — Type: Elmer 21212 (iso CAS, HUH, K, L, MO, SING,U), Elmer 21656 (para MO, SING),Borneo,Tawao.

Lasianthus sepalinus Ridl. (1934) 120, syn. nov. — Type: Ridley 9703 (holo K), Borneo , Bongaya , Labuk Bay; Clemens 9467 (para SING), Sandakan.

Shrubs, c. 1–2 m high; branchlets terete, c. 2 mm diam, densely appressed-pubescent, virid to brown. Leaves: blades oblong to oblong-lanceolate, 10 –22 by 3 –5.5 cm, coriaceous to subcoriaceous, glabrous and nitid above except midrib, densely shorthirsute or hispid beneath, apex shortly caudate-acuminate, base acute to subrounded, slightly asymmetric, midrib, nerves and nervules flat to slightly prominent above, conspicuously prominent beneath, nerves 8 –10 pairs, ascending at an angle of 60–70°, curved to the margin; nervules parallel; petioles 8 –10 mm long, densely pubescent. Stipules oblong-ovate to lanceolate, 2 – 3 mm long, densely pubescent. Cymes sessile; bracts absent. Flowers sessile, 5-merous; calyx campanulate,

Distribution of Lasianthus biflorus (Blume) M.Gangop. & ▲) and L. obscurus (Blume ex DC.) Miq. (¡).

hirsute, calyx tube c. 2 mm long, lobes 5, oblong, c. 3 mm long; corolla tube cylindrical, c. 6 mm long, pubescent outside, villose inside; corolla lobes 5, oblong, acute at apex, 3 mm long, pubescent outside, floccose inside; anthers oblong, c. 1.5 mm long. Drupes globose, c. 5 mm diam, with 5 obtuse ridges, hirsute, crowned by 5 large oblong calyx lobes; pyrenes 5.

Distribution — Malaysia (Borneo) and Brunei.

Note — This species is easily recognized by its hispid leaves, relatively large calyx and oblong calyx lobes with an obtuse apex. It is closely related to L. setulosus also from Borneo. Lasianthus setulosus differs in having densely spreading long hispid on branchlets and both surfaces of leaves, a relatively small calyx, 3 by 3 mm, with ovate-triangular calyx lobes with acute apex.