Lasianthus dinghouanus H.Zhu, 2012

39. Lasianthus dinghouanus H.Zhu View in CoL , sp. nov. — Fig. 12 View Fig

Proximus L. laxifloroideo H.Zhu , sed foliis lineari-lanceolatis 1–2 cm latis apice longicaudatis, floribus minoribus, lobis calycis triangularis 0.8 mm longis differt.A L. foetidissimo A.Chev.ex Pit. foliis apice longicaudatis,nervis 3–4-binatis, floribus 4-meris, drupis glabris et pyrenis 4 differt. —

Typus: Dyg Awa et al. S. 46999 (holo L; iso K, L), Borneo, G. Kanji, Lindu , 530 m alt., in non-dipterocarp forest on sandy soil, 18 Apr. 1984 .

Treelet, 4 m high, 2 cm diam; branchlets slender, terete, c. 2 mm diam, subglabrous to appressed-pubescent, brown. Leaves: blades linear-lanceolate, 10–14 by 1–2 cm, chartaceous to subcoriaceous, glabrous except more or less appressed-pubescent midrib and nerves beneath, apex long caudate, margin recurved, base acute to acuminate, midrib flat above, prominent beneath, nerves flat above, prominent beneath, 3–4 pairs, nervules slightly obscure above, conspicuous beneath, parallel, glabrous; petioles 8 –10 mm long, slender, more or less appressed-pubescent. Stipules subulate-triangular to triangular, 1–1.5 mm long, pubescent. Inflorescences peduncled; peduncles 5 –20 mm long, slender, trifurcate at apex, more or less pubescent; bracts very small, subulate, c. 1 mm long, pubescent. Flowers shortly pediceled; calyx campanulate, pubescent, tube c. 1 mm long, lobes 4, triangular, c. 0.8 mm long; corolla c. 5 mm long, tube glabrous outside, lobes 4, ovate, c. 1 mm long, pubescent external surface. Drupes with 1–2 mm long pedicels, globose, c. 4 mm diam, glabrous but very verrucose, 4-ridged; pyrenes 4, verrucose on the abaxial face.

Distribution — Endemic to Borneo.

Habitat & Ecology — Lower montane forest between 500 – 1300 m altitude. Flowering and fruiting between April and October.

Additional specimens examined. Sarawak,Lundu, Ftr. Ilias Paie S. 13619 (K, L); same locality, J.D. Mamit S.35169 (K, L); same locality, P.S.Ashton S.18876 (K, L); Sarawak, Gunong Silantek, Ilias Paie S. 42455 (K, L); Sarawak, G.Buri, P.Chai et al. S.36803 (L).

Note — This species is closely related to L. laxifloroideus . It differs from the latter by having glabrous or sparsely appressed-pubescent on branches and leaf midrib beneath, leaves linear-lanceolate, less than 2 cm broad; leaf apex long caudate; flowers relatively small, calyx lobes triangular, c. 0.8 mm long. It is also similar to L. foetidissimus , but differs from the latter by having leaves with a long caudate apex, nerves 3–4 pairs, flowers 4-merous, drupes glabrous with 4 pyrenes. Lasianthus foetidissimus has leaves with an acuminate and mucronate apex; nerves 6 pairs; flowers 5-merous; drupes pubescent with 5 pyrenes.