21. Dissochaeta glandiformis J.F.Maxwell, Gard. Bull. Singapore 33: 313, fig. 1. 1980. Map 15

Type.

Indonesia. Jambi: Kerintji Region, Gunung Tudjuh, 1800 m elev., Jul 1956, W. Meijer 7282 (holotype: L [L0537274]!).

Description.

Climbing up to 10 m in height. Branchlets terete, 4-5 mm diameter, densely stellate-furfuraceous; nodes swollen, with annular ridge crest-like, angular or ligular interpetiolar ridges up to 5 mm wide; internodes 6-8 cm long. Leaves: petioles flattened, 10-16 mm long, densely stellate-furfuraceous; blades ovate to ovate-elliptic, 7-16 × 5-8.5 cm, membranous, base rounded, margin entire, apex acuminate, tip 0.5-2 cm long; nervation with 1 pair of lateral nerves and 1 pair of intramarginal nerves; adaxially glabrous, abaxially densely brown stellate-tomentose. Inflorescences terminal and in the upper leaf axils, up to 22 cm long, many-flowered; main axis angular, densely stellate-furfuraceous; primary axes up to 18-20 cm long with 4-5 nodes, secondary axes 2-5 cm long with 2 or 3 nodes, tertiary axes 1-2.5 cm long with 1 or 2 nodes, quartenary axis up to 0.5 cm long when developed with 1 node; bracts minute, inconspicous; bracteoles linear, 1-2 mm long, densely stellate-furfuraceous; pedicels densely stellate-furfuraceous, 4-5 mm long in central flowers, 2-3 mm long in lateral flowers. Hypanthium campanulate, slightly angular, 3-5 × 1-3 mm, with four distinct ridges, densely stellate-tomentose, somewhat pointing sideways from pedicels; calyx lobes triangular with rounded tips, 2-2.5 mm long, widened, stellate-furfuraceous; lobes in bud distinctly united in thin acorn-like shape with sutures and opening when mature; petal bud conical, 3-6 mm long; mature petals ovate or oblong, 6-9 × 3-5 mm, base clawed, apex obtuse, glabrous or inside at base with appressed hairs, pink. Stamens 4, equal, alternipetalous, filaments flat, 4-6 mm long, straight, apex bent, anthers linear-lanceolate, sickle-shaped or falcate, thecae 5-6 mm long, yellow, pedoconnective ca. 1 mm long, basal crests minute, triangular, ca. 1 mm long, narrow with acute apex, lateral appendages paired, filiform, 3-5 mm long, tan. Ovary half or ⅔ of hypanthium in length, apex pubescent; style erect, 8-13 mm long, curved at apex, glabrous, purple; stigma minute; extra-ovarial chambers 4, alternipetalous, extending to the base of the ovary. Fruits ovoid, 5-6 × 3-5 mm, glabrous to sparsely stellate-furfuraceous, rarely with distinct vertical ridges, green, often pointing sideways from the pedicels; calyx lobe remnants persistent or sometimes caducous. Seeds ca. 0.5 mm long.

Distribution.

Sumatra (West).

Ecology and habitat.

Montane forest at 900-2500 m elevation.

Note.

Dissochaeta glandiformis resembles to D. intermedia with brown stellate- tomentose hairs in leaf blades abaxiallyly and having only 4 alternipetalous stamens with two filiform lateral appendages. This species differs from the latter by having a conspicous interpetiolar ridge (annular and crest-like or ligular) at the nodes and longer calyx lobes (2-2.5 mm long). The calyx lobes are distinctly united and have an acorn-like appearance when in bud, splitting into four lobes at maturity (Maxwell 1980b). This species is restricted to the montane forest of the Mount Kerinci complex, Sumatra.

Specimens examined.

INDONESIA. Jambi: Mt. Tujuh, 1800 m, Jul 1956, W. Meijer 7282 (L); Ibid., 6 Aug 1956, M. Jacobs 4517 (BO). West Sumatra: Mt. Kerinci, 900 m, 8 Feb 1920, H.A.B. Bünnemeijer 8074 (BO, L); Ibid., 2500 m, 7 Apr 1920, H.A.B. Bünnemeijer 9230 (BO, K, L); Ibid., 2000 m, 13 Apr 1920, H.A.B. Bünnemeijer 9379 (BO, L, U); Ibid., 1800 m, 12 May 1920, H.A.B. Bünnemeijer 10477 (BO, L).