Lasianthus ridsdalei H.Zhu, 2012

105. Lasianthus ridsdalei H.Zhu View in CoL , sp. nov. — Fig. 33

Similis L. lucido Blume , sed foliis lanceolatis,nervis 7–9-binatis,costis nervis et marginis subtus hirsutis, stipulis hirsutis, bracteis 2 subulatis patenter hirsutis, floribus 4-meris minoribus patenter hirsutis, pyrenis 4 differt. A L. microphyllo Elmer foliis lanceolatis, nervis 7– 9-binatis, costis nervis et marginis subtus hirsutis,stipulis hirsutis,bracteis 2 subulatis patenter hirsutis, floribus 4-meris minoribus patenter hirsutis, lobis calycis lanceolatis, pyrenis 4 differt. — Typus: C.E. Ridsdale 1046 (holo L), Philippines, Palawan,Infanta Mine area, 200 m alt., in lowland forest, 25 Oct. 1985.

Shrub, 1 m high; branchlets slender, terete, c. 1 mm diam, sparsely hirsute. Leaves: blades small, oblong-lanceolate to lanceolate, 3.5 –5.5 by 1.2–1.5 cm, coriaceous, glabrous above, sparsely pubescent or glabrescent except hirsute midrib, nerves and margin beneath, apex acute to acuminate, margin hirsute, base acute, midrib depressed above, prominent and hirsute beneath, nerves 7–9 pairs, flat above, prominent beneath, ascending at an angle of c. 70°, curved to the margin, sparsely hirsute beneath, nervules obscure above, conspicuous beneath, reticulate, puberulous or glabrescent beneath; petioles 3 –5 mm long, hirsute. Stipules subulate-triangular, c. 1 mm long, apex caudate, hirsute. Inflorescences sessile; bracts 2, subulate, 2 –3 mm long, spreading hirsute. Flowers solitary, sessile; calyx 2 mm long, sparsely spreading hirsute, tube c. 0.8 mm long, lobes 4, lanceolate, 1.2 mm long; corolla c. 5 mm long, spreading hirsute external surface on upper part, lobes 4, hirsute external surface, floccose internal surface. Drupes globose, glabrous or sparsely hirsute, c. 3 mm diam, obtusely 4-ridged, smooth external surface; pyrenes 4, smooth on the abaxial face, ovate-orbicular in transverse section.

Distribution — Endemic to Palawan ( Philippines).

Habitat & Ecology — In lowland forests on ultrabasic soil below 200 m altitude. Flowering in May; fruiting in October.

Additional specimen examined. Palawan, C.E. Ridsdale SMHI1837 (K,L).

Note — This species differs from L. lucidus by having leaves lanceolate, nerves 7–9 pairs, hirsute hairs on midrib, nerves, and margin beneath; stipules hirsute; bracts 2, subulate, spreading hirsute; flowers 4-merous, relatively small, spreading hirsute; drupes with 4 pyrenes. It differs from L. microphyllus by having leaves lanceolate, nerves 7–9 pairs, hirsute hairs on midrib, nerves, and margin beneath; stipules hirsute; bracts 2, subulate, spreading hirsute; flowers 4-merous, spreading hirsute; calyx lobes lanceolate; drupes with 4 pyrenes.