Dendrobium fractiflexum

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Dendrobium fractiflexum
Systematics
Family : Orchids (orchidaceae)
Subfamily : Epidendroideae
Tribe : Dendrobieae
Sub tribus : Dendrobiinae
Genre : Dendrobium
Type : Dendrobium fractiflexum
Scientific name
Dendrobium fractiflexum
Finet

The orchid Dendrobium fractiflexum is endemic to New Caledonia , which occurs only in the south of the island of Grande Terre . They are relatively large plants that grow in damp forests.

description

Dendrobium fractiflexum forms 0.5 to 2 m, according to other information up to 4 m high shoots , which are sometimes branched. The diameter of the stem axis is 3.5 to 5 mm, the length of the internodes 1.1 to 2 cm. The roots are 2 to 6 mm thick, their surface is warty and rough. The leaves measure (7) 9 to 16 cm long by (0.7) 1 to 2 cm wide.

The racemose , lateral inflorescence consists of three to twelve (up to 15) flowers . Flowering plants were found all year round. The inflorescence axis grows in a zigzag and overhangs downwards. The outer petals are 2.8 cm long, the flowers are 3 to 5 cm in size. The flower color is white, slightly green or slightly pink, with small red, pink or brown spots. The lip is green with white edges, three keels run lengthways. The column extends far beyond the point of attachment at the ovary ("column foot"), the lateral sepals form a bulge with the column foot ("mentum").

distribution

In the extreme south of New Caledonia Dendrobium fractiflexum is widespread, further north there are only a few finds. The plants usually grow at altitudes of 100 to 400 m, more rarely up to 600 m or 800 m. It grows in partially shaded or shady places in damp forests.

Systematics and botanical history

Dendrobium fractiflexum was described by Finet in 1903 . Within the genus Dendrobium , it was placed in the Macrocladium section, along with a few other species . However, this section is more closely related to other genera such as Flickingeria and Grastidium than to the type species of the genus Dendrobium . The name Grastidium fractiflexum was published by Rauschert in 1984 . Jones and Clements preferred even smaller genera and created the new genus Cannaeorchis with the type species Cannaeorchis fractiflexa for this family group. Other authors use broader generic concepts.

Individual evidence

  1. ↑ a b c d e f g Nicolas Hallé: Orchidacées . In: A. Aubréville, Jean.-F. Leroy (Ed.): Flore de la Nouvelle-Calédonie . tape 8 , 1977, ISBN 2-85654-152-6 , pp. 45-48 .
  2. ↑ a b c d e Société Néo-Calédonienne d'Orchidophilie (ed.): Orchidées indigènes de Nouvelle-Calédonie . 1995, ISBN 2-9509530-0-X , pp. 70-71 .
  3. ↑ Rafaël Govaerts (Ed.): Dendrobium fractiflexum. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved May 7, 2020.
  4. ↑ Jacinta M. Burke, Michael J. Bayly, Peter B. Adams, Pauline Y. Ladiges: Molecular phylogenetic analysis of Dendrobium (Orchidaceae), with emphasis on the Australian section Dendrocoryne, and implications for generic classification . In: Australian Systematic Botany . tape 21 , no. 1 , 2008, p. 1-14 , doi : 10.1071 / SB07038 .

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