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Dendrobium otaguroanum

Dendrobium otaguroanum

Dendrobium otaguroanum A.D.Hawkes, Lloydia 20 (1957) 122 (nom. nov.).

Type: Schlechter 19096 (syn B, lost; iso AMES, BO, G, L, NSW, S); 19673 (syn B), lost.

Synonyms:

  • Sayeria otaguroana (A.D.Hawkes) Rauschert, Feddes Repert. 94 (1983) 467.
  • Dendrobium chloroleucum Schltr., Repert. Spec. Nov. Regni Veg. Beih. 1 (1912) 490 (non Ridl.); 21 (1923) t. 165, fig. 620.
    - Type: Schlechter 19096 (syn B, lost; iso AMES, BO, G, L, NSW, S); 19673 (syn B), lost.

A small epiphytic herb. Pseudobulbs clustered, erect, 10-25 by 0.3-0.7 cm, 3-4-noded below leaves, yellow, 2-3-leaved at apex. Leaves coriaceous, narrowly lanceolate to ovate, acute, 5-7 by 1.2-2.1 cm. Inflorescence erect, 2.5-6.7 cm long, 2-6(or more)-flowered; bracts elliptic, apiculate, 4 mm long. Flowers subnutant; pedicel and ovary 1.7-2.5 cm long; ovary somewhat rugulose. Dorsal sepal ovate-lanceolate, acuminate, 1.6-1.8 by 0.5 cm; lateral sepals obliquely lanceolate, acuminate, 1.6-2 by 0.8-1 cm broad; mentum obliquely conical, 7-8 mm long. Petals obovate, obtuse or apiculate, 1.6-1.5 by 0.8-1 cm. Lip entire, obovate, apiculate, narrowly clawed at base, 1.6-2.2 by 1.5-1.6 cm; callus fleshy, 3-ridged, over half length of lip. Column 2.5 mm long; foot 7-8 mm long.
(after Cribb, 1983).


Flowers white with yellowish green venation on the lip.

Epiphyte in montane forests of Nothofagus, Podocarpus, Castanopsis, etc. Altitude 1500 to 2200 m.

New Guinea.

Papua (widespread); Papua New Guinea .

Map: Dendrobium otaguroanum A.D.Hawkes, distribution map, redrawn from P. Cribb, Kew Bull. 38 (1983) 242, map 3.

Cool growing epiphyte.

January, March, October.

  • Family Orchidaceae
  • Subfamily Epidendroideae
  • Tribe Dendrobieae
  • Subtribe Dendrobiinae
  • Genus Dendrobium
  • Section Latouria
  • Species Dendrobium otaguroanum
  • Cribb, P.J. 1983. Kew Bull. 38: 266, fig. 8G, H, 9, pl. 13E, map 3.
  • Howcroft, N.H.S. 1977. Orchadian 5: 146, fig.

Dendrobium otaguroanum A.D.Hawkes is most similar to Dendrobium rhodostictum F.Muell. but differs in having smaller flowers with an entire obovate lip lacking any rose-purple spotting on its margin. In flower size it is much closer to the Pacific Islands species Dendrobium ruginosum Ames from the Santa Cruz Isl. and Dendrobium mooreanum Lindl. from 'Aniteuna' Isl., but these are both readily distinguished by their angular pseudobulbs and narrower lips, somewhat oblong to rhombic in outline.

Dendrobium otaguroanum A.D.Hawkes is apparently restricted in its distribution to mainland New Guinea but before 1983 a collection was sent to Kew by G. H. Slade from Panguna in Bougainville which closely resembled this species in its flower structure. Large populations of Dendrobium rhodostictum F.Muell. and Dendrobium ruginosum grow on steep man-made slopes by the road at Panguna and field studies did confirmed Cribb's (1983) suspicion that the Slade collection is not Dendrobium otaguroanum but rather a primary hybrid of Dendrobium rhodostictum and Dendrobium ruginosum.
(after Cribb, 1983)


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Dendrobium otaguroanum

Dendrobium otaguroanum A.D.Hawkes, flower, photo D. Titmuss, based on D. Banks cult.

Dendrobium otaguroanum

Dendrobium otaguroanum A.D.Hawkes, photo John Cara, plant habit, cult. John Cara, from PNG.

Dendrobium otaguroanum

Dendrobium otaguroanum A.D.Hawkes, photo John Cara, flowers, front view, cult. John Cara, from PNG.

Dendrobium otaguroanum

Dendrobium otaguroanum A.D.Hawkes, photo John Cara, flower, oblique front view, cult. John Cara, from PNG.

Dendrobium otaguroanum

Dendrobium otaguroanum A.D.Hawkes, photo John Cara, flower, oblique lateral view, cult. John Cara, from PNG.

Dendrobium otaguroanum

Dendrobium otaguroanum A.D.Hawkes, photo John Cara, inflorescence, cult. John Cara, from PNG.

Dendrobium otaguroanum

Dendrobium otaguroanum A.D.Hawkes, photo John Cara, flower, oblique front view, cult. John Cara, from PNG.

Dendrobium otaguroanum

Dendrobium otaguroanum A.D.Hawkes, photo John Cara, flowers, oblique lateral view, cult. John Cara, from PNG.

Dendrobium otaguroanum

Dendrobium otaguroanum A.D.Hawkes, habit, photo N.E.G. Cruttwell, based on Cruttwell (1/79, PNG, Aiyura)

Dendrobium otaguroanum

Dendrobium otaguroanum A.D.Hawkes, inflorescence, photo D. Titmuss, based on D. Banks cult.

Dendrobium otaguroanum

Dendrobium otaguroanum A.D.Hawkes, plant habit, photo Ed de Vogel, Leiden cult. 20120725 (N. & F. Juhonewe), from Papua New Guinea, Morobe Prov.

Dendrobium otaguroanum

Dendrobium otaguroanum A.D.Hawkes, inflorescence, photo Ed de Vogel, Leiden cult. 20120725 (N. & F. Juhonewe), from Papua New Guinea, Morobe Prov.

Dendrobium otaguroanum

Dendrobium otaguroanum A.D.Hawkes, flower, oblique front view, photo Ed de Vogel, Leiden cult. 20120725 (N. & F. Juhonewe), from Papua New Guinea, Morobe Prov.

Dendrobium otaguroanum

Dendrobium otaguroanum A.D.Hawkes, drawing by S.P. Hillier in Kew Bull. 38 (1983) 263, fig. 8 G, H

Dendrobium otaguroanum

Dendrobium otaguroanum A.D.Hawkes, drawing by N.H.S. Howcroft in Kew Bull. 38 (1983) 265, fig. 9

Dendrobium otaguroanum

Dendrobium otaguroanum A.D.Hawkes, drawing John Cara, plant habit and flower analyses.

Dendrobium otaguroanum

Dendrobium otaguroanum A.D.Hawkes, drawing John Cara, flower analyses.

Dendrobium otaguroanum

Dendrobium otaguroanum A.D.Hawkes (as Dendrobium chloroleucum Schltr.), drawing R. Schlechter in Repert. Spec. Nov. Regni Veg. Beih. 21 (1923) t. 165, fig. 620

Dendrobium otaguroanum

Dendrobium chloroleucum Schltr. (= Dendrobium otaguroanum A.D.Hawkes), isotype specimen: Schlechter 19096 (L)

Dendrobium otaguroanum

Dendrobium chloroleucum Schltr. (= Dendrobium otaguroanum A.D.Hawkes), detail of isotype specimen: Schlechter 19096 (L)