Dissochaeta barbata (Triana ex C.B.Clarke) Karton., 2018

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

8. Dissochaeta barbata (Triana ex C.B.Clarke) Karton. comb. nov. Map 5

Anplectrum stellulatum Geddes, Bull. Misc. Inform. Kew: 236. 1928. Type: Thailand. Phitsanulok: Nakhon Thai, 200 m elev., 17 Apr 1922, A.F.G. Kerr 5870 (lectotype, designated here: K [K000859555]!; isolectotypes: BK [BK-257160, image seen]!, BM!).

Anplectrum cyanocarpa auct. non. Triana: Kurz, Forest Fl. Burma 1: 508. 1877. p.p. excl. type.

Anplectrum glaucum auct. non. Triana: C.B.Clarke in Hook. f., Fl. Brit. India 2: 545. 1879. p.p., excl. type.

Backeria barbata (Triana ex C.B.Clarke) Raizada, Indian Forester 94: 435. 1968.

Diplectria barbata (Triana ex C.B.Clarke) Franken & M.C.Roos in Veldkamp et al., Blumea 24: 415, fig. 3A. 1979.

Dissochaeta divaricata auct. non. G.Don: Clausing in Renner et al., Fl. Thailand 7(3): 423. 2001. p.p., excl. type.

Basionym.

Anplectrum barbatum Triana ex C.B.Clarke in Hook. f., Fl. Brit. India 2: 546. 1879.

Type.

Myanmar. Martaban: Chappedong, N. Wallich 4082 (holotype: K [K000859568]!).

Description.

Climbing up to 10 m in height. Branchlets terete, 3-5 mm in diameter, glabrous or with scattered minute stellate hairs; nodes swollen, with interpetiolar ridge; internodes 4-6.5 cm long. Leaves: petioles terete, 10-15 mm long, glabrous to stellate-puberulous, covered with bristle hairs at dorsal side; blades elliptic-oblong to oblong, 6.5-13 × 2.5-5 cm, chartaceous, 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 with sparsely stellate hairs at nerves, with a pair of basal glandular patches. Inflorescences terminal, up to 30 cm long, many-flowered; main axis terete, glabrous or stellate-puberulous; primary axes up to 28 cm long with 8 or 9 nodes, secondary axes up to 10 cm long with 4 or 5 nodes, tertiary axes up to 2 cm long with 1 or 2 nodes, quarternary axes up to 1 cm long with 1 node; bracts linear, 2-4 mm long, stellate puberulous; bracteoles linear, 3-4 mm long, stellate puberulous; pedicels stellate-puberulous, 4-6 mm long in central flowers, 2-4 mm long in lateral flowers. Hypanthium campanulate-angular to suburceolate, 5-6 × 2-3 mm, slightly 4-ridged, glabrous or stellately puberulous; calyx lobes truncate, without 4 distinct tips, ca. 1 mm long; petal bud conical, 4-5 mm long; mature petals ovate-elliptic, ca. 7 × 4-4.5 mm, not reflexed, base clawed, apex acute, pink to purplish. stamens 8, unequal, filaments straight; alternipetalous stamens staminodial, with 3-4 mm long filaments, thecae rudimentary, slender, terete, ca. 4 mm long, pedoconnective undeveloped, basal crest triangular, ca. 2 mm long, acute or erose at tip, thin, lateral appendages in a pair, linear to filiform, ca. 2 mm long; oppositipetalous stamens with 5-6 mm long filaments, anthers thick, curved, S-shaped, thecae 8-9 mm long, yellow, apex rostrate, basal crest triangular, ca. 1 mm long, basal appendages bifid, 1-2 mm long. Ovary ⅔ of hypanthium in length, apex glabrous; style glabrous, 13-15 mm long, curved at the end, slender, pink; stigma minute; extra-ovarial chambers 4, oppositipetalous, extending almost to the base of the ovary. Fruits urceolate, 7-8 × 4-5 mm, glabrous; calyx lobe remnants persistent. Seeds numerous, ca. 0.75 mm long, cuneate.

Distribution.

Myanmar, Indo-China, South China (Hainan; fide Chen & Renner 2007) and Thailand.

Ecology and habitat.

Mixed deciduous and disturbed evergreen forest to mountainous forest at 90-1500 m elevation.

Vernacular name.

kyar ma naing (Myanmar), 藤牡丹, teng mu dan (China)..

Note.

Dissochaeta barbata resembles D. divaricata in the hypanthium and fertile stamens, with the alternipetalous stamens staminodal and the oppositipetalous ones fertile. Dissochaeta barbata differs in having a subglabrous indumentum in most parts and in possessing a pair of glandular patches on the base of leaf blades underneath. This is the only known species that is completely distributed outside the Malesian region.

Selected specimens examined.

MYANMAR. Ban Han: Bon s.n. (P). Martaban: Chappedong, N. Wallich 4082 (K). Tanintharyi: Yaphyu, Alel Taung, Kyaukshut Village, 297 m, 24 Mar 2015, K. Armstrong et al. 627 (NY). Tenasserim: 31 May 1869, J.W. Helfer 2290 (K), Kallin Kwan Chaung, 60 m, 10 Feb 1926, C.E. Parkinson 1691 (K); Mergui, W. Griffith KD 2289 (K). CAMBODIA. Chuo Chan, L. Pierre s.n. (BM, K, L). VIETNAM. Bien Hoa: Chiao Pang, Mar 1877, L. Pierre s.n. (P). Bum Mo: 18 May 1921, B. Hayata 337 (P). Haut Donnai: Blao, 1000 m, 21 Feb 1933, E. Poilane 22026 (L, P). Khanh Hoa: Dien Khanh, Hon Ba, 900 m, 24 Jun 2004, D.D. Soejarto & T.N. Ninh 13310 (L, P). Kontum: Dakto, Ngok Guga, 1000 m, 27 Nov 1946, E. Poilane 35651 (L, P). Lang Go Rum: Cu Bi, 600 m, 28 Jul 1925, E. Poilane 12234 (P). Nghe An: Con Cuong, Ye Khe, 16 Oct 2008, Du et al. 3009 (K). Quang Duc: Dak Song, 800 m, 19 Mar 1953, E. Schmid s.n. (P). Quang Nam: Moi Se Go, 1500 m, 25 Feb 1941, E. Poilane 31700 (P). Quang Tri: Lang Vieng Ap, 400 m, 13 Jun 1924, E. Poilane 10854 (L, P). THAILAND. Chonburi: Kao Re Chan, 600 m, 21 Apr 1931, H.S.H. Lakshnakara 739 (K). Kanchanburi: Thong Paphum, 19 Apr 1967, B. Nimanong 89 (L). Petchaburi: Khao Cong, 8 Jan 1929, A.F.G. Kerr 16573 (BM, K, L); Kaeng Krachan, Panoen Thung, 100 m, 27 Jan 2005, K. Williams et al. 1148 (L). Phang Nga: Kapong, 100 m, 17 Feb 1929, A.F.G. Kerr 17113 (BM, K); Kao Paw Ta Luang Keo, 29 Apr 1974, K. Larsen & S.S. Larsen 33470 (K, L, P). Phitsanulok: Nakhon Thai, 200 m, 17 Apr 1922, A.F.G. Kerr 5870 (BK, BM, K). Ranong: Khlong Kam Puan, 100 m, 1 May 1973, R. Geesink & T. Santisuk 5098 (L); Muang, 400 m, 25 Apr 2005, R. Pooma et al. 5259 (L).

Figures

Map 5. Distribution of D. atrobrunnea (●), D. bakhuizenii (■) and D. barbata (▲).