Prev Taxon: Genus Dendrobium section Herpetophytum
Current Genus: Genus Dendrobium section Latouria
Next Taxon: Genus Dendrobium section Microphytanthe
Dendrobium amphigenyum
Dendrobium amphigenyum Ridl., Trans. Linn. Soc. London, Bot. 9 (1916) 176.
Type: Kloss s.n. (Camp 6a, 3100 ft.) (holo BM).
Synonyms:
- Sayeria amphigenya (Ridl.) Rauschert, Feddes Repert. 94 (1983) 466 ('amphigenia').
- Dendrobium fantasticum L.O.Williams, Bot. Mus. Leafl. 12 (1946) 158.
- Type: Brass 12844 (holo AMES; iso L); para Clemens 12213.
An erect epiphytic or lithophytic herb. Pseudobulbs cylindrical or slightly dilated above, 5-8-noded below leaves, 7-40 by 0.4-0.8 cm, orange-yellow when dry, 2-3-leaved. Leaves coriaceous, suberect, lanceolate, acuminate, 5.5-12 by 1.2-2.5 cm. Inflorescences terminal, subterminal or from uppermost node below leaves, suberect, 6-8 cm long, few-flowered; bracts falcate, lanceolate, acute, 5-6 mm long. Flowers small, fleshy; pedicel and ovary 1.7-2.2 cm. Dorsal sepal elliptic, obtuse, 10-12 by 5-6 mm; lateral sepals very obliquely elliptic, obtuse, 9 by 9 mm; mentum subsaccate, 5-7 mm long. Petals falcate, oblanceolate, obtuse, 6 by 2 mm, with erose margins. Lip clawed, 3-lobed, strongly recurved at base, 0.7-0.8 by 0.7-1 cm; side-lobes erect, oblong-elliptic, rounded at apex, erose on margins; midlobe smaller than side-lobes, deeply emarginate with a mucro in the sinus, with each lobule acute or subacute; callus fleshy, 3-ridged with a lower rugulose apex. Column 2 mm long; foot incurved, 5-7 mm long.
(after Cribb, 1983).
Sepals and petals creamy to green, mottled with purple; lip purplish.
Epiphyte in mossy forest. Also found as a terrestrial on road banks. Altitude 1600-2300 m.
New Guinea.
Papua (Paniai and Jayapura Regencies); Papua New Guinea (Enga, Eastern Highlands, Madang, and Morobe Provinces).
Cool growing epiphyte.
February, May, June, August, December.
- Family Orchidaceae
- Subfamily Epidendroideae
- Tribe Dendrobieae
- Subtribe Dendrobiinae
- Genus Dendrobium
- Section Latouria
- Species Dendrobium amphigenyum
- Cribb, P.J. 1983. Kew Bull. 38: 296, fig. 18A-D, map 6.
- Spence, P.J. 1997. Lasianthera 1: 155, fig. 2.
Dendrobium amphigenyum Ridl. has been confused in the past with both Dendrobium dendrocolloides J.J.Sm. and Dendrobium woodsii P.J.Cribb. It differs from the former in having a 3-lobed lip in which the midlobe is as long as the side-lobes and is deeply emarginate. From the latter, it may be distinguished by its shorter midlobe in which the lobules are tapering and acute rather than dilated and obtuse above.
(after Cribb, 1983).
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Dendrobium amphigenyum
Dendrobium amphigenyum Ridl., inflorescence, photo Roy. Bot. Gard. Kew, based on Kew cult. (Reeve 355)
Dendrobium amphigenyum
Dendrobium amphigenyum Ridl., habit, photo Roy. Bot. Gard. Kew, based on Kew cult. (Reeve 355)
Dendrobium amphigenyum
Dendrobium amphigenyum Ridl., flower, photo P. O'Byrne, based on O'Byrne D285
Dendrobium amphigenyum
Dendrobium amphigenyum Ridl., plant habit, cult John Cara, from PNG, photo John Cara
Dendrobium amphigenyum
Dendrobium amphigenyum Ridl., photo John Cara, inflorescence, cult John Cara, from PNG.
Dendrobium amphigenyum
Dendrobium amphigenyum Ridl., photo John Cara, flower, oblique lateral view, cult John Cara, from PNG.
Dendrobium amphigenyum
Dendrobium amphigenyum Ridl., photo John Cara, flower, oblique lateral view, cult John Cara, from PNG.
Dendrobium amphigenyum
Dendrobium amphigenyum Ridl., drawing by M. Church in Kew Bull. 38 (1983) 298, fig. 18 A, B (based on Reeve 355)
Dendrobium amphigenyum
Dendrobium amphigenyum Ridl., drawing by M. Church in Kew Bull. 38 (1983) 298, fig. 18 C, D (based on Woods 2340)
Dendrobium amphigenyum
Dendrobium fantasticum L.O.Williams (= Dendrobium amphigenyum Ridl.), detail of isotype specimen: Brass 12844 (L)
Dendrobium amphigenyum
Dendrobium fantasticum L.O.Williams (= Dendrobium amphigenyum Ridl.), isotype specimen: Brass 12844 (L)