Lasianthus pedicellatus H.Zhu, 2012

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 : 71

publication ID	https://doi.org/10.3767/000651912X652012
persistent identifier	https://treatment.plazi.org/id/1664BC60-3C0B-0D41-FCA2-4893FC6B7344
treatment provided by	Felipe
scientific name	Lasianthus pedicellatus H.Zhu
status	sp. nov.

Treatment

92. Lasianthus pedicellatus H.Zhu View in CoL , sp. nov. — Fig. 30 View Fig

Proximus L. oblongo King & Gamble , sed stipulis minoribus, calycibus tri- angulatis dentatis, drupis levigatis obtuse 4–5-porcatis, pyrenis 4–5 differt. — Typus: De Vogel 5344 (holo L), Sulawesi, Palu, Mt Poroka Timbu, 1950 m alt., in primary montane forest, 14 May 1979 .

Treelet, 2 m high; branchlets terete, c. 1.5 mm diam, dark in the youngest part, glabrous or thinly puberulous. Leaves: blades lanceolate, 6 – 9 by 1.5– 2.5 cm, glabrous except sparsely puberulous midrib and nerves beneath, apex acuminate to caudate, aristate, arista c. 1 mm long, margin recurved, base acute, midrib slightly depressed above, prominent beneath, nerves flat above, prominent beneath, 5 pairs, ascending at an angle of c. 60°; nervules prominent on both surfaces, parallel; petioles c. 5 mm long, sparsely puberulous or glabrescent. Stipules very small, triangular, less than 1 mm long. Inflorescences extremely congested to nearly sessile; bracts absent. Flowers fascicular, pediceled; pedicels slender, c. 2 mm long; calyx obconical, c. 1 mm long, with 5 triangular teeth, puberulous; corolla c. 4 mm long, puberulous outside. Drupes subglobose, c. 3 mm diam, smooth, subglabrous, with 4–5 obtuse ridges; pyrenes 4–5, smooth on the abaxial face, orbicular at the transverse section.

Distribution — Malaysia (Sabah) and Indonesia (Sulawesi).

Habitat & Ecology — In montane forest between 1500–2000 m altitude. Flowering and fruiting between March and May.

Additional specimens examined. Sulawesi, Mt Roroka Timbu, E.F. de Vogel 5136 (K,L); Borneo, Sabah, J.H. Beaman 8928 (K, L); Sabah,Kinabalu, J & M.S. Clemens 29838 (L).

Note — This species is closely related to L. oblongus , but differs from the latter by having very small stipules, calyx with triangular teeth, drupes smooth, with 4–5 obtuse ridges and crowned by small triangular calyx teeth, pyrenes 4–5. Lasianthus oblongus has relatively big stipules 3–4 mm long, calyx shallow cupular with truncate limb, drupes verrucose, with 7–8 obtuse ridges and crowned by a short cupular calyx limb, pyrenes 7–8.