Dissochaeta micrantha (Veldkamp) Karton.,

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

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scientific name

Dissochaeta micrantha (Veldkamp) Karton.

comb. nov.

37. Dissochaeta micrantha (Veldkamp) Karton.  comb. nov. Map 21View Map 21

Diplectria glabra (Merr.) M.P.Nayar var. micrantha  (Veldkamp) J.F.Maxwell, Gard. Bull. Singapore 33: 313. 1980.


Diplectria micrantha  Veldkamp, Blumea 24: 422, fig. 5B. 1978.


Malaysia. Sabah: Ranau District, Mount Kinabalu, Sosopodon, 4720 ft. elev., 30 Jan 1962, I.H. Sario SAN 28959 (holotype: L [L0008871]!; isotypes: K [K000859550]!, SAN n.v.).


Branchlets terete, 3-4 mm in diameter, glabrous; nodes swollen, with prominent annular, 2-3 mm wide, crest-like interpetiolar ridge, margin with 3-5 mm long simple bristles; internodes 6-12 cm long. Leaves: petioles terete, 5-10 mm long, glabrous to nearly furfuraceous and dorsally with bristle hairs; blades ovate, 6.5-9 × 3.5-5 cm, subcoriaceous, base cordate, margin entire, apex acuminate, tip 0.5-1 cm long; nervation with 1 pair of lateral nerves and 1 pair of intramarginal nerves; adaxially glabrous, abaxially glabrous except scattered stellate hairs on the nerves. Inflorescences terminal, up to 25 cm long, many-flowered; main axis angular, glabrous; primary axes up to 23 cm long with 7-9 nodes, secondary axes 8-10 cm long with 5-7 nodes, tertiary axes up to 1.5 cm long with 1 or 2 nodes, quarternary axes when developed up to 0.5 cm long with 1 node; bracts linear or ligular, 3-4 mm long, glabrous, caducous; bracteoles subulate, 1-2 mm long, glabrous; pedicels stellate-furfuraceous, 2-3 mm long in central flowers, ca. 1 mm long in lateral flowers. Hypanthium urceolate, ca. 3 × 1-1.5 mm, glabrous; calyx lobes truncate, ca. 0.3 mm long, apex with 4 minute points; petal buds conical, 1-1.5 mm long; mature petals suborbicular, 2-2.5 × ca. 2 mm, reflexed, base clawed, apex acute, pink. Stamens 8, unequal, filaments straight; alternipetalous stamens staminodial, with ca. 1 mm long filaments, thecae rudimentary, ca. 0.5 mm long, slender, terete, basal crest triangular, thin, ca. 1 mm long, apex erose, base with a small auricle, lateral appendages absent; oppositipetalous stamens with 1-2 mm long filaments, anthers thick, oblong, thecae 2-2.5 mm long, white, basal crest keels bifid, ca. 0.2 mm long, lateral appendages bifid, ca. 0.3 mm long. Ovary ⅔ of hypanthium in length, apex glabrous; style 3-4 mm long, glabrous; stigma minute, capitate; extra-ovarial chambers 4, oppositipetalous, extending to ⅓ of the ovary. Fruits subglobose, 4-5 × ca. 4 mm, glabrous; calyx lobe remnants persistent. Seeds ca. 0.5 mm long.


Borneo (Sabah and North Kalimantan).

Ecology and habitat.

Montane forest on river banks or in open places at 1100-1400 m elevation.


The desciption of the flowers is based on a bud only since mature flowers are still unknown. This species is restricted to the montane forests of Mount Kinabalu, Sabah and Kayan Mentarang, North Kalimantan.

Specimens examined.

MALAYSIA. Sabah: Ranau, Mt. Kinabalu, Sosopodon, 1440 m, 30 Jan 1962, I.H. Sario SAN 28959 (K, L); Ibid., Tenompok, 1500 m, 29 Feb 1932, J. Clemens & M.S. Clemens 28588 (BM, K); Ibid., May 1932, J. Clemens & M.S. Clemens 30341 (K); Ibid., between Tenompok and Kundasan, 1400 m, 15 Jul 1957, J. Sinclair et al. 9235 (L); Ibid., Sungai Mamut, 1200-1400 m, 15 Feb 1969, S. Kokawa & M. Hotta 5798 (L). INDONESIA. North Kalimantan: Krayan, Kayan Mentarang, Long Bawan, 1100 m, 29 Jul 1981, M. Kato et al. B-10105 (BO, L).














Dissochaeta micrantha (Veldkamp) Karton.

Kartonegoro, Abdulrokhman, Veldkamp, Jan Frits, Hovenkamp, Peter & Welzen, Peter van 2018

Diplectria glabra (Merr.) M.P.Nayar var. micrantha

J. F. Maxwell 1980