Dissochaeta acmura Stapf & M.L.Green, Bull. Misc. Inform. Kew: 42. 1913.

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

1. Dissochaeta acmura Stapf & M.L.Green, Bull. Misc. Inform. Kew: 42. 1913. Map 2

Type.

Philippines. Luzon: Province of Albay, H. Cuming 2838 (lectotype, designated here: K [K000859613]!).

Description.

Climbing up to 8 m in height. Branchlets terete, 2.5-4 mm in diameter, covered with stellate hairs, dense on young branches and nodes, glabrescent; nodes swollen, with interpetiolar ridge; internodes 5-10 cm long. Leaves: petioles flattened, 10-23 mm long, densely stellate-furfuraceous; blades ovate to elliptic, 8.3-17.2 × 3.7-6.8 cm, membranous, rarely subcoriaceous, base rounded or subcordate, margin entire, apex acute or acuminate, tip 0.5-2 cm long; nervation prominent above, with 1 pair of lateral nerves, 1 pair of intramarginal nerves; adaxially glabrous, abaxially brown stellate-tomentose, dense on midrib. Inflorescences axillary, 5.5-10 cm long, 3-10 flowers; main axis terete, densely stellate-furfuraceous and with simple glandular hairs; primary axes 11-13 cm long, with 3 or 4 nodes; secondary axes 1-1.4 cm long, with 1 or 2 nodes; tertiary axes 0.8-1 cm long, with 1 node or undeveloped; bracts linear, ca. 5 mm long, densely stellate-furfuraceous, caducous; bracteoles linear, 1-2 mm long, densely stellate-furfuraceous, caducous; pedicel densely stellate-furfuraceous, 5-7 mm long in central flowers, 2-3 mm long in lateral flowers. Hypanthium tubular or slightly funnel-shaped, 7-11 × 3-5.5 mm, densely stellate-tomentose, sparsely covered with scattered simple glandular bristle hairs; calyx lobes truncate with 4 minute tips, 1-3 mm long; petal buds conical, 8-13 × 3-9 mm; mature petals obovate to suborbicular, 18-20 × 13-15 mm, reflexed or not, base clawed, apex obtuse, glabrous, white or white with pinkish hue, hairy at edge. Stamens 8, unequal, glabrous, filaments curved sideways; alternipetalous stamens with white-creamy filaments, 10-12 mm long, apex yellow, anthers slightly curved, sickle-shaped, slender, thecae 10-12 mm long, pink, pedoconnective 3-4 mm long, basal crest bifid up to 2 mm long, lateral appendages paired, filiform, white, 3-3.5 mm long; oppositipetalous stamens with white filaments, ca. 10 mm long, anthers S-shaped, thecae 10-12 mm long, pink, basal crest minute or ligular, ca. 0.5 mm long, margin erose, lateral appendages paired, filiform, 5-6 mm long, bright white. Ovary ¾ of hypanthium in length, apex glabrous, 8-ridged; style 17-22 mm long, glabrous, curved sideways, opposite to the filaments, slightly curved at the end when mature, whitish; stigma minute; extra-ovarial chambers 8, the 4 alternipetalous ones extending to near the base of the ovary, the 4 oppositipetalous ones extending to about the middle of the ovary. Fruits urceolate, ellipsoid, 8-15 × 5-10 mm, stellate-furfuraceous, brownish green when unripe; calyx remnants persistent, erect, widened. Seeds ca. 0.5 mm long.

Distribution.

Philippines.

Ecology and habitat.

Open shade, along ridges, on wet or less sandy ground in forest or secondary forest at 220-300 m elevation.

Note.

Dissochaeta acmura resembles D. axillaris in having axillary inflorescences, but differs in its membranous leaf blades and triangular mature calyx lobes, while D. axillaris has coriaceous leaf blades and truncate calyx lobes.

Specimens examined.

PHILIPPINES. Biliran: Mt. Suiro, 30 Apr 1954, M.D. Sulit PNH 21567 (K, L, PNH). Catanduanes: M. Ramos BS 30366 (BM, P); San Miguel, 21 Nov 1991, Barbon, Garcia & Alvarez PPI 2425 (L). Cebu: Cebu Central, 800 m, May 1998, D. Bicknell 1490 (L). Leyte: 1 May 1914, C.A. Wenzel 414 (BM); 14 May 1914, C.A. Wenzel 662 (BM); Baybay, Villa Solidaridad, 150 m, H.O. Gutierrez PNH 119985 (PNH). Luzon: Aurora, Diteki, 550 m, 9 May 1996, R.U. Fuentes & L. Fernando PPI 37255 (L); Ibid., 450 m, 19 May 1996, R.U. Fuentes & L. Fernando PPI 37459 (L); Ibid., Casiguran, Bianoan, 19 Mar 1993, Barbon, Garcia & Fernando PPI 9293 (L); Cagayan, Claveria, 467 m, 3 Aug 1995, Garcia et al. PPI 18314 (L); Ibid., Santa Praxedes, 520 m, 11 Aug 1995, Garcia, Fuentes & Romero PPI 18494 (L); Camarines Norte, Basud, Mount Nilisan, 9 Sep 1991, Reynoso, Romero & Fuentes PPI 1317 (L); Camarines Sur, Iriga, Mt. Asog, 14 Jun 1992, Barbon, Romero & Fuentes PPI 8440 (L); Laguna, Jun-Aug 1915, R.C. MacGregor BS 22859 (BM, P); Zambales, San Antonio, Aug 1910, M. Ramos BS 437 (U); Ibid., Sep–Oct 1912, M. Ramos BS 16612 (BM, L); San Mariano, SO. Agal, 200 m, 2 Jul 1994, Barbon, Romero R.U. Fuentes PPI 13023 (L); Sorsogon, Irosin, Mt. Bulusan, 300 m, Dec 1915, A.D.E. Elmer 15257 (BM, BO, K, L, P, PNH, U), Ibid., 300 m, Aug 1916, A.D.E. Elmer 16844 (BM, BO, K, L, P, PNH, U); Ibid., Lake Polog, Aug 1915, M. Ramos BS 23644 (BM, BO, K, P, PNH); Albay Province, H. Cuming 2838 (K); Quezon Province, Lalawinan, Tipuan, 2 Sep 1991, Barbon, Alvarez & Garcia PPI 2212 (K, L); Ibid., Burdeos, Kinabuawan, 24 Aug 1991, Barbon, Alvarez & Garcia PPI 2037 (K, L); Ibid., Tayabas, H. Cuming 815 (BM, K); Ibid., H. Cuming 2840 (K); Ibid., Lucban, May 1907, A.D.E. Elmer 8236 (BM, BO, K, L, P, PNH, U); Ibid., Mt. Tulaog, May 1917, M. Ramos & G.E. Edano BS 29114 (BO). Mindanao: Agusan Del Norte, Butuan, San Mateo, Tungao, 250 m, 31 May 1961, D. Mendoza PNH 41847 (BO, K, L, PNH); Ibid., 8 Jun 1961, D. Mendoza PNH 42217 (L, PNH); Ibid., 85 m, 25 Aug 1966, S. Jurane PNH 98404 (PNH); Agusan del Sur, Dinagat, Binahanan, 80 m, 9 Oct 1991, Gaerlan, Sagcal & Fernando PPI 4855 (L); Lanao del Sur, Lake Lanao, Camp Keithley, 1907, M.S. Clemens 1155 (BO); Surigao, 3 Jul 1927, C.A. Wenzel 3043 (BO, K); Surigao del Sur, Aras-Asan, 250 m, 17 May 1975, University of San Carlos 819 (L); Cotabato, Mabuhay Mining Camp, 25 May 1950, Aňonuevo PNH 13453 (BM, PNH). Samar: Oquendo, Mt. Mahagna, 220 m, 17 Apr 1951, M.D. Sulit PNH 14463 (K, L, PNH); Ibid., 30 Apr 1951, M.D. Sulit PNH 14514 (BM, K, L, PNH); Paranas, 17 Oct 1992, Reynoso, Sagcal & Garcia PPI 7448 (L); Ibid., 400 m, 1 May 1996, Reynoso & Majaducon PPI 21956 (L).

Figures

Map 2. Distribution of D. acmura (●), D. alstonii (■) and D. angiensis (▲).