Dissochaeta sagittata Blume, Flora 14: 500. 1831.

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

48. Dissochaeta sagittata Blume, Flora 14: 500. 1831. Map 25

Dissochaeta intermedia Blume var. sagittata (Blume) J.F.Maxwell, Gard. Bull. Singapore 33: 315. 1980.

Type.

Indonesia. Java, Bantam, C.L. Blume 11 (lectotype, designated here: L [L0537226]!; isolectotype: L [L0537228]!).

Description.

Climbing up to 7 m in height. Branchlets terete, 3-4 mm in diameter, densely stellate-furfuraceous; nodes swollen, with interpetiolar ridge, covered by stellate-furfuraceous hairs; internodes 6-7 cm long. Leaves: petioles flattened, 10-15 mm long, densely stellate-furfuraceous; blades oblong, 8.5-13 × 3-4.5 cm, membranous, base rounded, margin entire, apex acuminate, tip ca. 1 cm long; nervation with 1 pair of lateral nerves and 1 pair of intramarginal nerves; adaxially glabrous, abaxially densely brown stellate-furfuraceous. Inflorescences terminal and in the upper leaf axils, up to 30 cm long, many-flowered; main axis quadrangular, densely stellate-furfuraceous; primary axes up to 26 cm long with 5 or 6 nodes, secondary axes 3-6 cm long with 2 or 3 nodes, tertiary axes up to 0.8-2 cm long with 1 or 2 nodes; bracts oblong to lanceolate, 9-10 × 2-3 mm, stellate-furfuraceous; bracteoles lanceolate, 4-6 mm long, stellate-furfuraceous, distinctly nerved; pedicels densely stellate-furfuraceous, 4-7 mm long in central flowers, 2-5 mm long in lateral flowers. Hypanthium campanulate, 4-7 × 3-5 mm, densely stellate-furfuraceous; calyx lobes truncate with 4 more or less triangular tips, ca. 1 mm long, stellate-furfuraceous; petal buds conical, 2-8 mm long; mature petals oblong, 9-11 × ca. 4 mm, base clawed, apex obtuse, glabrous, red to pinkish-red. Stamens 8, unequal, filaments straight; alternipetalous stamens with ca. 6 mm long filaments, anthers lanceolate, thecae 6-7 mm long, straight, pedoconnective 1-1.5 mm long, basal crest triangular, hastate to sagittate, ca. 1.5 mm long, lateral appendages paired, filiform, 3-4 mm long, sometimes unequal in length; oppositipetalous stamens with 4-6 mm long filaments, anthers ovate, thecae 3-5 mm, straight or falcate, basal crest spuriform or ligulate, 0.5-1 mm long, lateral appendages absent. Ovary ⅔ of hypanthium in length, apex pubescent; style 13-15 mm long, curved at apex, glabrous; stigma minute, capitate; extra-ovarial chambers 8, extending to below the middle of the ovary. Fruits urceolate, 8-10 × 5-6 mm, sparsely hairy to glabrescent; calyx lobes persistent, erect. Seeds ca. 0.5 mm long.

Distribution.

Java (West).

Ecology and habitat.

Secondary forest at 700-1400 m elevation.

Specimens examined.

INDONESIA. Banten: C.L. Blume 11 (L). West Java: Bogor, Mt. Karang Gantungan, C.A. Backer 6272 (BO); Ibid., Cisangku, C.A. Backer 10549 (BO); Cianjur, Sukanegara, E.R. Hellendoorn 8 (BO); Mt. Gede, H. Raap 695A (L); Bandung, Nanggerang, C.A. Backer 9097 (BO).

Figures

Map 25. Distribution of D. rostrata (●), D. rubiginosa (▲) and D. sagittata (■).