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Trachoma rhopalorrhachis

Trachoma rhopalorrhachis

Trachoma rhopalorrhachis (Rchb.f.) Garay, Bot. Mus. Leafl. 23, 4 (1972) 208

Synonyms:

  • Dendrocolla rhopalorrhachis Rchb.f., Bonplandia 5 (1857) 40
    - Type: Zollinger s.n. (Java, 'Bandong' = Bandung) (holo W)
  • Thrixspermum rhopalorrhachis (Rchb.f.) Rchb.f., Xenia Orchid. 2 (1868) 121
  • Sarcochilus rhopalorrhachis (Rchb.f.) Rchb.f. in Walp., Ann. Bot. Syst. 6 (1861) 500
  • Saccolabium rhopalorrhachis (Rchb.f.) J.J.Sm., Orchid. Java (1905) 644
  • Tuberolabium rhopalorrhachis (Rchb.f.) J.J.Wood, Nordic J. Bot. 10 (1990) 482
  • Sarcochilus brachyglottis Hook.f., Fl. Brit. Ind. 6 (1890) 34
    - Type: King s.n. (holo K?)
  • Thrixspermum brachyglottis (Hook.f.) Kuntze, Rev. Gen. Pl. (1891) 682
  • Dendrocolla brachyglottis (Hook.f.) Ridl., Fl. Malay Penins. 4 (1924) 189
  • Trachoma speciosum D.L.Jones, B.Gray, M.A.Clem. & J.J.Wood, Austral. Orchid Res. 1 (1989) 145
    - Type: ANBG cult. (Butler 408 = M.A. Clements 3643) s.n. (Australia, Queensland, Cook Distr., McIlwraith Ra., Leo Creek) (holo CBG)
  • Tuberolabium speciosum (D.L.Jones & al.) J.J.Wood, Nordic J. Bot. 10 (1990) 482
  • Parapteroceras speciosum (D.L.Jones & al.) Szlach., Ann. Bot. Fennici 40 (2003) 67

Basionym: Dendrocolla rhopalorrhachis

Small epiphyte; stems erect or suberect, 2-15 cm long, with 2-7 leaves in upper part, not or sparsely branching. Leaves 5-12 by 1.5-2.5 cm, oblong to lanceolate, thick, leathery, apex variable, obtuse to acute, entire to distinctly bilobulate. Inflorescence usually arising below the lowest leaves, usually horizontal to erect, up to 5-10 cm long, a densely many-flowered raceme with the flowers opening in successive clusters; peduncle 1-1.1 cm long, rachis gradually elongating as more flowers are produced, swollen, 0.4-05 cm diam. Flowers widely opening, up to 1.4 cm wide, short-lived. Median sepal 0.9 by 0.3 cm, oblong, acute. Lateral sepals similar but somewhat oblique. Petals 1 by 0.2 cm, linear-ligulate, with erose margins, apex acute. Lip spurred, weakly 3-lobed; lateral lobes about 0.2 cm below the lip apex, obliquely oblong, very thick, between the lateral lobes and the mid-lobe with a small very fleshy lobule; mid-lobe small, porrect, conical, fleshy; spur 0.1 cm long, in the concave center of the lip, pointing downwards, conical, laterally flattened, obtuse. Column 0.2 cm long, narrow, with very short acute stelidia. (After O’Byrne, 1994)

Note: We are unable to see significant differences between Trachoma speciosum D.L.Jones & al.and Trachoma rhopalorrhachis (Rchb.f.) Garay so we consider them conspecific.


Sepals and petals creamy white with a brownish purple transverse bar near the base, lip white with an orange-yellow patch just below the mid-lobe.

Epiphyte in various types of lowland forest, including savanna and limestone hill forest; 40 to 600 m.

Malesia (Peninsular Malaysia, Sumatra, Java, Borneo, ?Sulawesi, Moluccas, New Guinea, Philippines), Thailand, ?Laos, Vietnam, Australia.

Indonesia (Papua), Papua New Guinea. See map

distribution map.

February, April.

  • Smith, J.J., Orchid. Java, Fig.-Atl. (1914) fig. 479, as Saccolabium rhopalorrhachis (Rchb.f.) J.J.Sm.
  • Howcroft, N, Orchadian 3 (1969) 54, fig., as Tuberolabium speciosum (D.L.Jones & al.) J.J.Wood
  • O'Byrne, P., Lowland Orchid. Papua New Guinea (1994) 534, fig., as Trachoma speciosum D.L.Jones, B.Gray, M.A.Clem. & J.J.Wood
  • Family Orchidaceae
  • Subfamily Epidendroideae
  • Tribe Vandeae
  • Subtribe Aeridinae
  • Genus Tuberolabium
  • Species Tuberolabium rhopalorrhachis

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Trachoma rhopalorrhachis

overview picture

Trachoma rhopalorrhachis

Trachoma rhopalorrhachis (Rchb.f.) Garay, flowers, photo A. Schuiteman, based on Leiden cult. 20031895

Trachoma rhopalorrhachis

Trachoma rhopalorrhachis (Rchb.f.) Garay, flower, front view, photo E.F. de Vogel, based on Leiden cult. 20031890

Trachoma rhopalorrhachis

Trachoma rhopalorrhachis (Rchb.f.) Garay, inflorescence, photo E.F. de Vogel, based on Leiden cult. 20031890

Trachoma rhopalorrhachis

Trachoma rhopalorrhachis (Rchb.f.) Garay, flower, oblique lateral view, photo E.F. de Vogel, based on Leiden cult. 20031890

Trachoma rhopalorrhachis

Trachoma rhopalorrhachis (Rchb.f.) Garay, plant habit, photo E.F. de Vogel, based on Leiden cult. 20031890

Trachoma rhopalorrhachis

Trachoma rhopalorrhachis (Rchb.f.) Garay, habit, photo A. Schuiteman, based on Leiden cult. 20031895

Trachoma rhopalorrhachis

Trachoma rhopalorrhachis (Rchb.f.) Garay, flowers, photo A. Schuiteman, based on Leiden cult. 20031895

Trachoma rhopalorrhachis

Trachoma rhopalorrhachis (Rchb.f.) Garay, inflorescence, photo A. Schuiteman, based on Yumte 274

Trachoma rhopalorrhachis

Trachoma rhopalorrhachis (Rchb.f.) Garay, habit and floral analysis, drawing N.H.S. Howcroft 7, from Brown River

Trachoma rhopalorrhachis

Trachoma rhopalorrhachis (Rchb.f.) Garay (as Saccolabium rhopalorrhachis (Rchb.f.) J.J.Sm.), floral analysis, drawing J.J. Smith