Dissochaeta punctulata Hook.f. ex Triana, Trans. Linn. Soc. London 28: 83. 1872.

Kartonegoro, Abdulrokhman, Veldkamp, Jan Frits, Hovenkamp, Peter & Welzen, Peter van, 2018, A revision of Dissochaeta (Melastomataceae, Dissochaeteae), PhytoKeys 107, pp. 1-178 : 1

44. Dissochaeta punctulata Hook.f. ex Triana, Trans. Linn. Soc. London 28: 83. 1872. Map 23

Type.

Malaysia. Peninsular Malaysia, Malacca, W. Griffith KD 2291 (lectotype, designated here: K [K000859531]!; isolectotype: BM!).

Description.

Climbing up to 27 m in height; branchlets terete, 3-5 mm in diameter, sparsely furfuraceous with minute red-brown hairs; nodes swollen, with interpetiolar line; internodes 2-7 cm long. Leaves: petioles terete, 5-15 mm long, striate, glabrescent; blades ovate or ovate-elliptic, 4.2-11 × 2.5-5.5 cm, subcoriaceous, base rounded to cuneate, margin entire, apex acuminate, tip ca. 0.5 cm long; nervation with 1 pair of lateral nerves and 1 pair of intramarginal nerves; adaxially glabrous, abaxially sparsely stellate punctate. Inflorescences terminal and in the upper leaf axils, up to 15 cm long, many-flowered; main axis densely stellate-furfuraceous; primary axes 15-20 cm long with 4-6 nodes, secondary axes 3-10 cm long with 2-4 nodes, tertiary axes 1-2 cm long with 1 or 2 nodes; bracts linear, ca. 4 mm long, densely furfuraceous, caducous; bracteoles linear, 2-3 mm long, densely furfuraceous, caducous; pedicels densely furfuraceous, 2-3 mm long in central flowers, 1-2 mm long or subsessile in lateral flowers. Hypanthium campanulate, but urceolate to subglobose at first stage, enclosing the petal bud, 6-10 × 5-6 mm, densely red-brown tomentose; calyx lobes triangular with acute tips, 1-2 mm long, densely stellate-furfuraceous, densely pubescent inside; petal buds conical, 2-4 mm long; mature petals obovate, ca. 10 × 5-7 mm, reflexed, base clawed, apex rounded, glabrous with ciliate margin, white. Stamens 8, unequal to subequal, filaments curved sideways, white yellowish; alternipetalous stamens with (5 –)9– 10 mm long filaments, anthers curved, sickle-shaped, slender, thecae 9-12 mm long, flexed, maroon, pedoconnective 3-4 mm long, basal crest fimbriate, somewhat branched, 4-5 mm long, lateral appendages paired, filiform or fimbriate, 7-8 mm long; oppositipetalous stamens with 5-8 mm long filaments, anthers S-shaped, thick, thecae 7-8 mm long, yellow, basally erose or bifid or with a fimbriate crest, somewhat branched, 3-5 mm long, lateral appendages paired, irregularly filiform, 6-8 mm long. Ovary ¾ of hypanthium in length, apex villous; style slender, 5-8 mm long, curved at top, white; stigma minute, villous; extra-ovarial chambers absent or not developed. Fruits urceolate or subglobose, 8-10 × 4-7 mm, sparsely to densely furfuraceous; calyx lobe remnants persistent, reflexed. Seeds ca. 0.75 mm long.

Distribution.

Malay Peninsula and Sumatra (Riau Archipelago).

Ecology and habitat.

Disturbed lowland primary forest or secondary forest at 300-600 m elevation.

Vernacular name.

Peninsular Malaysia: akar muroyan busuh (Malacca).

Specimens examined.

MALAYSIA. Johor: Feb 1890, H.N. Ridley 2016 (BM); Puiron, Nov 1891, N. Cantley 62 (K); Gunung Pulai, 24 Apr 1922, M. Nur & Kiah SFN 7799 (BO, K); Ibid., 18 Dec 1922, G.A. Best SFN 7849 (BO); Ibid., 4 Sep 1971, Chan FRI 17660 (K, L); Ibid., 550 m, 29 Jan 1978, J.F. Maxwell 78-23 (L); Ibid., 500 m, 18 Jan 1981, J.F. Maxwell 81-15 (L); Bukit Paloh, 30-60 m, 9 Apr 1958, M. Shah & Kadim 431 (K, L); Endau, Kampong Hubong, 18 Jul 1959, Kadim & M. Noor 357 (BO, K); Mawai-Jemaluang Road, 5 May 1935, E.J.H. Corner SFN 29377 (BO, K); Labis, 27 Apr 1986, L.G. Saw FRI 34336 (K, L). Malacca: W. Griffith s.n. (BO, K, L, P); W. Griffith KD 2291 (BM, K); D.F.A. Hervey s.n. (BM); 16 May 1886, A.C. Maingay KD 789 (1220A) (K, L); Sungai Hudang, 1892, H.N. Ridley 548 (BM, K). Negri Sembilan: Tebong, 19 Jan 1917, H.N. Ridley s.n. (K); Jelebu, Pasoh Forest, 80-120 m, 10 May 1996, E.C. Gardette 1850 (K, L); Ibid., E.C. Gardette 1850B (K, L). Penang: G.W. Walker 30 (BM, K). Terengganu: Gunong Padang, Ulu Brang, 600 m, 23 Sep 1969, T.C. Whitmore FRI 12786 (K, L); Ibid., T.C. Whitmore FRI 12794 (K, L). SINGAPORE. N. Cantley s.n. (BM); Bukit Timah, 21 Sep 1890, H.N. Ridley 3858 (BM, L); Ibid., 24 Feb 1977, J.F. Maxwell 77-88 (L); Changi, 26 May 1891, H.N. Ridley s.n. (BM); Punggol, Mar 1878, R.W. Hullett 505 (K); Pierce Reservoir, 25 Jun 1955, J. Sinclair SFN 40649 (BO, K, L, P); Ibid., 13 May 1981, J.F. Maxwell 81-91 (L); Tanjong Gul, 5 Feb 1950, J. Sinclair s.n. (L, P); Bukit Mandai, 1893, Anon 4803 (BM); Seletar, 22 Jul 1892, H.N. Ridley 3918 (BM). INDONESIA. Riau Archipelago: Lingga Islands, Rejai Island, 20 m, 19 Aug 1919, H.A.B. Bünnemeijer 7633 (BO, K, PNH); Senggarang Island, J.E. Teijsmann s.n. (BO, L); Bintan Island, Tanjung Pinang, J.E. Teijsmann s.n. (BO); Ibid., Gunung Bintan, 300 m, 19 Jun 1919, H.A.B. Bünnemeijer 6162 (BO); Ibid., Mount Kijang, 25 m, 30 Jun 2013, D. Girmansyah 1847 (BO).

Figures

Map 23. Distribution of D. porphyrocarpa (●) and D. punctulata (■).