Lasianthus tenuifolius H.Zhu, 2012

123. Lasianthus tenuifolius H.Zhu View in CoL , sp. nov. — Fig. 38 View Fig

Similis L. attenuato var. minore H.Zhu , sed foliis tenui-chartaceis, stipulis subulato-linearibus, bracteis inconspicuis, fructibus glabribus et pyrenis 7–8 differt. — Typus: W. Ave 100 (holo L), Peninsular Malaysia, Perak, 550 m alt., in hill dipterocarp forest, 31 Aug. 1982 .

Shrub, 1 m high; branchlets slender, terete, spreading villous. Leaves: blades narrow-oblong to linear-oblong, 6 –10 by 1.5– 2.5 cm, thinly chartaceous, sparsely spreading villous on both surfaces, densely on midrib and nerves, apex acute, margin ciliate, base rounded, oblique, midrib flat above, prominent beneath, nerves obscure above, slightly prominent beneath, 6–9 pairs, ascending at an angle of 45–50°, curved to the margin; petioles short, 1–2 mm long, villous. Stipules subulate-linear, 3 –5 mm long, villous. Inflorescences sessile; bracts inconspicuous. Flowers fascicular; calyx campanulate, 3–4 mm long, glabrous to sparsely villous on external surface, lobes 5, triangular-lanceolate, 2.5 mm long, glabrous to sparsely villous; corolla 6 –7 mm long, villous on external surface, lobes ovate-triangular. Drupes oblate-globose, 4–5 by 3–4 mm, glabrous, yellowish, 7–8 conspicuously sulcate; pyrenes 7–8, ovate-triangular in transverse section, smooth but with a furrow on the abaxial face, shallow furrow on the sides.

Distribution — Malaysia (Peninsular, Borneo) and Indonesia (Sumatra).

Habitat & Ecology — In hill rainforest between 50–600 m altitude. Flowering and fruiting between August and November.

Additional specimens examined. W Kalimantan, Kohyama et al. K 10591 View Materials (L). Sarawak, P.Chai et al. S.31536 (L); C. Hose 156 (L). Brunei, M.J.E. Coode 6402 (L). Sabah, B.C. Stone SAN 85255 (K, L). Borneo, Bukit Raya, Veldkamp 8048 (L); Korth. s.n. W Sumatra, H. Nagamasu 3277 (L). Peninsular Malaysia, Selangor, KEP­FRI 1958 (L); Perak, W. Ave 24 (L); Pasoh, KEP­FRI 25703 (L); Pasoh, E.G.1532 (L).

Note — This species is quite similar to L. attenuatus var. minor . It differs from the latter by having thinly chartaceous leaves; nerves obscure upper surface; stipules subulate-linear; bracts inconspicuous; drupes glabrous; pyrenes 7–8. Lasianthus attenuatus var. minor has chartaceous to subcoriaceous leaves with conspicuous nerves upper surface; stipules linear-lanceolate; bracts conspicuous, linear to linear-lanceolate; drupes hirsute; pyrenes 4–5. This species was confused with L. cyanocarpus (= L. inaequalis ). Miquel (1857) doubted that a drupe with 8 pyrenes was found in L. inaequalis and later stated that drupes with 8 pyrenes do not occur in L. inaequalis ( Miquel 1869) . In our opinion, the specimens with 8-pyrened drupes present the new species.