Lasianthus baasianus H.Zhu, 2012

7. Lasianthus baasianus H.Zhu View in CoL , sp. nov. — Fig. 2 View Fig

Proximus L. longifolio Wight ,sed ramulis, foliis subtus et calycibus puberulis, stipulis minoribus,floribus minoribus atque limbis calycis ad maturitatem fructus 2 mm longis differt.A L. pseudolongifolio H.Zhu ramulis foliisque subtus puberulis et limbis calycis cupulatis truncatis differt. —

Typus: Nooteboom 4189 (holo L), Borneo,Bukit Raya , 112°45'E, 0°45'S, 1300 m alt., in primary dipterocarp forest, 5 Dec. 1982 GoogleMaps .

Treelet, 3 m high; branchlets robust, compressed or subangular, fistulous, c. 5 mm diam, pubescent to glabrescent. Leaves: blades elliptic-oblong, 18 –30 by 6 –11 cm, coriaceous, glabrous above, puberulous beneath, apex cuspidate, base acute to subrounded, midrib prominent above, conspicuously prominent beneath, puberulous beneath, nerves depressed to flat above, prominent beneath, 9 pairs, ascending at an angle of 50–70°, curved to the margin, puberulous beneath, nervules clear above, prominent beneath, subreticulate, puberulous beneath; petioles 1–3 cm long, puberulous. Stipules triangular, 3 by 3 mm, pubescent. Inflorescences sessile, or shortly tuberculate; bracts inconspicuous. Flowers fascicular, sessile; calyx 3–4 mm long, pubescent, limb cupular, truncate or 4 minutely teeth; corolla 6–7 mm long, upper part puberulous external surface, lobes 4, lanceolate, 3 mm long, puberulous external surface, flocculous internal surface. Drupes subglobose, 5 by 6 mm, with 5 conspicuous ridges, puberulous, crowned by persistent cupular calyx limbs; calyx limbs 2 mm long; pyrenes 5, smooth on the abaxial face, subelliptic in transverse section.

Distribution — Endemic to Borneo.

Habitat & Ecology — In lowland primary dipterocarp forest between 100 –500 m altitude. Flowering between April and December; fruiting in January.

Additional specimens examined. Sarawak, Paul Chai S. 34053 (L); Central Kalimantan, J.P. Mogea et al. 4019 (L); Borneo, Bukit Raya, Veldkamp 8003 (L), Nooteboom 4735 (L); Central Kalimantan, A.C. Church et al. 888 (L), 937 (K, L).

Note — This species is close to L. longifolius Wight. It differs from the latter by having pubescent branchlets, leaves beneath and calyx; smaller stipules (3 by 3 mm) and relatively small flowers (up to 8 mm long); drupe crowned by 2 mm long calyx limb. While L. longifolius has glabrous branchlets, leaves and calyx; stipules up to 1 cm long; flowers up to 3 cm long; drupes crowned by 5 mm long enlarged cupular calyx limb. It differs from L. pseudolongifolius by having pubescent branchlets, leaves beneath, and cupular, truncate calyx limbs.