Dissochaeta glabra Merr. var. glabra

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

20.1. Dissochaeta glabra Merr. var. glabra Fig. 14 , Map 13

Description.

Hypanthium ca. 4 × 2 mm, glabrous or sparsely covered with stellate hairs, dark green; petal bud conical, 1-1.5 mm long; mature petals suborbicular, 3-4 × 3-3.5 mm, reflexed, white purplish or purple, base clawed, apex acute. Stamens 8, unequal, filaments straight; alternipetalous stamens staminodial, with ca. 3 mm long filaments, thecae ca. 0.5 mm long, basal crest triangular, ca. 0.75 mm long, thin, base emarginate or hastate, apex acute, lateral appendages prolonged from the locule vestige, paired, filiform, 3-4 mm long; oppositipetalous stamens with 4-5 mm long filaments, thecae 5-6 mm long, yellow or creamy, basal crest triangular, ca. 0.3 mm long, erose to bifid, lateral appendages ligular with bifid apex, ca. 0.5 mm long. Ovary half to ¾ of hypanthium in length, apex glabrous; style glabrous, 8-10 mm long, curved at the end, slender; stigma minute, capitate; extra-ovarial chambers extending to half of the ovary. Fruits subglobose to urceolate, 4-5 × ca. 4 mm, glabrous.

Distribution.

Borneo.

Ecology and habitat.

Lowland mixed dipterocarp forest to lower montane forest, in open places at 20-1200 m elevation.

Specimens examined.

MALAYSIA. Sabah: Kalabakan, Pinajas River, 20 m, 8 Oct 1916, A. Villamil 242 (K, PNH, US); Ibid., Ulu Sungai Kalabakan, 19 May 1984, Fidilis & Martin SAN 103669 (K, L); Ibid., Gunong Rara, 21 Apr 1972, G. Shea SAN 75633 (K, L); Lahad Datu, Danum Valley, 12 Jun 1986, E.J.F. Campbell et al. SAN 112059 (L); Ibid., 7 May 1989, C.E. Ridsdale 1961 (K, L); Ibid., 238 m, 6 Jul 2006, S. Suzana et al. SAN 147687 (K, L); Ibid., Silabukan, 183 m, 21 Apr 1967, J. Sinanggul SAN 58046 (K, L); Ibid., Ulu Segama, 170 m, 25 Feb 1986, P.J. Edwards 2111 (K); Ibid., 200 m, 28 Feb 1985, G. Argent et al. 108277 (K, L); Lamag, Inarat, Gunong Lotong, 1000 m, 16 Aug 1976, Saikeh SAN 83210 (K); Nabawan, Gunung Lotong, Meliah Basin, 19 Apr 1988, L. Madani SAN 124418 (K); Ranau, Sungai Nabutan, 23 Mar 1982, Joseph SAN 94559 (K, L); Sandakan, Segaliud Lokan, 106 m, 30 May 1963, Banang SAN 36928 (K, L); Ibid., Gadong Camp, 58 m, 4 Apr 1963, James SAN 35395 (K, L); Ibid., Gomantong, 17 Apr 1970, Rusonkhan SAN 66574 (K); Ibid., Kabili-Sepilok, 4 Jun 1937, Enggoh 7246 (K); Ibid., Sepilok, 7 Apr 1954, D.D. Wood A 2987 (K, L); Tenom, Mandalom, 27 Aug 1987, Asik Mantor SAN 120365 (K, L); Tawau, A.D.E. Elmer 20794 (BM, L, P, PNH, U), St. Lucia, Pinayas, 60 m, 8 May 1940, P. Orolfo 8 (K, L). Sarawak: Bintulu, Tubau, Ulu Jejalong, Bukit Sekiwa, 300 m, 2 Sep 1986, Abang Mochtar S.53947 (AAU, L). INDONESIA. East Kalimantan: West Kutai, Hikam Batu Beng, 80 m, 28 Jul 1925, F.H. Endert 2275 (BO, L); Sangkulirang, Babi Jolong, 40 m, 3 Jun 1937, Aet 599 (BO). North Kalimantan: Malinau, 20 m, 2 Jul 1981, R. Geesink 8926 (L). South Kalimantan: Muara Uya, Jaro Dam, 80 m, 17 Nov 1971, E.F. de Vogel 881 (K, L).

Figures

Map 13. Distribution of D. floccosa (●) and D. glabra var. glabra (■).

Figure 14. Dissochaeta glabra var. glabra a habit b branchlet c hypanthium d flower e fruits. Photographs by D. Penneys; vouchers: Penneys 2446 (WNC), Penneys 2474 (WNC) & Penneys 2487 (WNC).