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Dendrobium johnsoniae

Dendrobium johnsoniae

Dendrobium johnsoniae F.Muell., S. Sci. Rec. 2 (1882) 95.

Type: Chalmers s.n. (New Guinea, E. Peninsula) (holo MEL; iso K).

Synonyms:

  • Dendrobium macfarlanei Rchb.f., Gard. Chron. (1882, II) 520 (non F.Muell.).
    - Type: Veitch cult. (Macfarlane) s.n. (holo W).
  • Dendrobium niveum Rolfe, Gard. Chron. (1891, I) 104 (nom. nov.).
  • Callista macfarlanei (Rchb.f.) Kuntze, Rev. Gen. Pl. (1891) 655.
  • Dendrobium monodon Kraenzl., in Engl., Pflanzenr. IV. 50. II. B. 21 (1910) 254.
    - Type: Weinland 314 (holo HBG).
  • Sayeria johnsoniae (F.Muell.) Rauschert, Feddes Repert. 94 (1983) 467.

An erect epiphytic herb. Pseudobulbs stout, subclavate, 4-6-noded below leaves, 20-30 by 0.8-1.1 cm, yellow, 4-5-leaved at apex. Leaves coriaceous, elliptic or oblong-elliptic, obtuse, 8-11 by 3.5-4.5 cm. Inflorescence terminal or from below leaf bases, erect or suberect, 17-27 cm long, few-many-flowered; bracts elliptic-lanceolate, acute, 4-7 mm long. Flowers large, attractive, white with purple lines on side lobes of lip and base of column; pedicel and ovary 1.7-2.2 cm long. Dorsal sepal lanceolate, acuminate, 2.6-2.8 by 0.7-0.8 cm; lateral sepals obliquely lanceolate, acuminate, 2.6-3.4 by 1-1.1 cm; mentum obliquely conical, 8-9 mm long, somewhat nose-like towards apex. Petals narrowly clawed, rhombic above, acuminate, 4.2-5 by 1.8-3 cm. Lip not recurved, 3-lobed, 3.5-4.6 by 2-3 cm; side-lobes erect, subquadrate, with erose margins; midlobe much longer than side-lobes, ovate-lanceolate, acuminate, narrow at base; callus fleshy, obscurely 2-ridged at base. Column short, 3 mm long, with two hook-like stelidia at apex; foot 7-9 mm long.
(after Cribb, 1983).

The distribution of this species in New Guinea and the Solomon Islands closely parallels that of Dendrobium spectabile.
(after Cribb, 1983).


Flowers white with purple to reddish lines on side lobes of lip and base of column.

Epiphyte in montane forests of Araucaria, Albizia, Casuarina etc. Altitude 500 to 1200 m.

New Guinea, Solomon islands.

Papua (Manokwari, Yapen Waropen, and Jayapura Regencies); Papua New Guinea (Sandaun, Madang, Morobe, Central, and Oro Provinces).

Map: Dendrobium johnsoniae F.Muell., distribution map, redrawn from P. Cribb, Kew Bull. 38 (1983) 234, map 2, with new records added.

Intermediate growing epiphyte.

April to November.

  • Schlechter, R. 1912. Repert. Spec. Nov. Regni Veg. Beih. 1: 492.
  • Schlechter, R. 1923. Repert. Spec. Nov. Regni Veg. Beih. 21: t. 166, fig. 622.
  • van Bodegom, J. 1973. Enige orchidee├źn van West Nieuw Guinea: 72.
  • Hunt, P.F. 1969. Curtis's Bot. Mag. 177: t. 560 (hybrid!).
  • Cribb, P.J. 1983. Kew Bull. 38: 260, fig. 7, pl. 12A, C-D, map 2.
  • Lewis, B. & P.J. Cribb. 1991. Orchids of the Solomon Islands and Bougainville: 175, pl. 9F.
  • O'Byrne, P. 1994. Lowland Orchids of Papua New Guinea: 276, fig., pl.

According to Cribb, Dendrobium johnsoniae is allied to Dendrobium rhodostictum and Dendrobium otaguroanum but is readily distinguished by its pure white flowers veined with purple-red on the lip side-lobes only, its rhombic petals and an elongate lip with a lanceolate midlobe.


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Dendrobium johnsoniae

overview

Dendrobium johnsoniae

Dendrobium johnsoniae F.Muell., habit, in situ, photo P. O'Byrne, based on O'Byrne D260

Dendrobium johnsoniae

Dendrobium johnsoniae F.Muell., habit, photo Roy. Bot. Gard. Edin., based on Edinburgh cult. X64-2562

Dendrobium johnsoniae

Dendrobium johnsoniae F.Muell., flowers, photo D. Titmuss, based on D. Smedley cult., ex Karkar Island, PNG

Dendrobium johnsoniae

Dendrobium johnsoniae F.Muell., photo John Cara, plant habit, cult John Cara, from PNG.

Dendrobium johnsoniae

Dendrobium johnsoniae F.Muell., photo John Cara, inflorescence, cult John Cara, from PNG.

Dendrobium johnsoniae

Dendrobium johnsoniae F.Muell., photo John Cara,flower, front view, cult John Cara, from PNG.

Dendrobium johnsoniae

Dendrobium johnsoniae F.Muell., photo John Cara,flower, oblique front view, cult John Cara, from PNG.

Dendrobium johnsoniae

Dendrobium johnsoniae F.Muell., photo John Cara,flower, oblique lateral view, cult John Cara, from PNG.

Dendrobium johnsoniae

Dendrobium johnsoniae F.Muell., photo John Cara,plant habit, cult John Cara, from PNG.

Dendrobium johnsoniae

Dendrobium johnsoniae F.Muell., photo John Cara,flower, front view, cult John Cara, from PNG, Finchhafen..

Dendrobium johnsoniae

Dendrobium johnsoniae F.Muell., photo John Cara,flower, lateral view, cult John Cara, from PNG, Finchhafen..

Dendrobium johnsoniae

Dendrobium johnsoniae F.Muell., photo John Cara,flower, front view, cult John Cara, from PNG, Kar Kar Island.

Dendrobium johnsoniae

Dendrobium johnsoniae F.Muell., photo John Cara,flower, front view, cult John Cara, from PNG, Sogeri Plateau.

Dendrobium johnsoniae

Dendrobium johnsoniae F.Muell., photo John Cara,flower, oblique front view, cult John Cara, from PNG, Sogeri Plateau..

Dendrobium johnsoniae

Dendrobium johnsoniae F.Muell., plant habit, photo Ed de Vogel, National Capital Botanic Garden Port Moresby cult. s.n., from Papua New Guinea, locality not known

Dendrobium johnsoniae

Dendrobium johnsoniae F.Muell., flower, front view, photo Ed de Vogel, National Capital Botanic Garden Port Moresby cult. s.n., from Papua New Guinea, locality not known

Dendrobium johnsoniae

Dendrobium johnsoniae F.Muell., flower, obliqie front view, photo Ed de Vogel, National Capital Botanic Garden Port Moresby cult. s.n., from Papua New Guinea, locality not known

Dendrobium johnsoniae

Dendrobium johnsoniae F.Muell., flower, oblique lateral view, photo Ed de Vogel, National Capital Botanic Garden Port Moresby cult. s.n., from Papua New Guinea, locality not known

Dendrobium johnsoniae

Dendrobium johnsoniae F.Muell., flower, lateral view, photo Ed de Vogel, National Capital Botanic Garden Port Moresby cult. s.n., from Papua New Guinea, locality not known

Dendrobium johnsoniae

Dendrobium johnsoniae F.Muell., column and lip, front view, photo Ed de Vogel, National Capital Botanic Garden Port Moresby cult. s.n., from Papua New Guinea, locality not known

Dendrobium johnsoniae

Dendrobium johnsoniae F.Muell., column and lip base, front view, photo Ed de Vogel, National Capital Botanic Garden Port Moresby cult. s.n., from Papua New Guinea, locality not known

Dendrobium johnsoniae

Dendrobium johnsoniae F.Muell., callus on lip base, view from above, photo Ed de Vogel, National Capital Botanic Garden Port Moresby cult. s.n., from Papua New Guinea, locality not known

Dendrobium johnsoniae

Dendrobium johnsoniae F.Muell., drawing by D. Pearce in Kew Bull. 38 (1983) 261, fig. 7

Dendrobium johnsoniae

Dendrobium johnsoniae F.Muell., drawing John Cara, plant habit, flower analysis, from PNG.

Dendrobium johnsoniae

Dendrobium johnsoniae F.Muell., drawing R. Schlechter in Repert. Spec. Nov. Regni Veg. Beih. 21 (1923) t. 166, fig. 622