Vrydagzynea

Vrydagzynea, commonly called tonsil orchids,[2] is a genus of orchids in the tribe Cranichideae. About forty five species of Vrydagzynea have been formally described. They are native to India, Taiwan, Southeast Asia, Malesia, Melanesia and Polynesia. A single species in Australia is possibly extinct. They have thinly textured, stalked leaves and small, dull-coloured resupinate flowers with the dorsal sepal and petals overlapping to form a hood over the column.

Tonsil orchids
Drawing of Vrydagzynea albida
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Orchidoideae
Tribe: Cranichideae
Subtribe: Goodyerinae
Genus: Vrydagzynea
Blume[1]

Description

Orchids in the genus Vrydagzynea are terrestrial, perennial, deciduous, sympodial herbs with a fleshy, creeping, above-ground rhizome anchored by wiry roots. The leaves are thinly textured and stalked, arranged in a rosette at the base of the flowering stem or scattered along it. Small, resupinate dull-coloured flowers are crowded along the short flowering stem which usually has protruding bracts. The dorsal sepal and petals overlap, forming a hood over the column. The labellum has a downward pointing spur and two stalked glands that resemble tonsils or testicles. Orchids in this genus are distinguished from those in other similar genera by the labellum glands, labellum spur and by having petals which are shorter than the sepals.[2][3][4][5][6]

Taxonomy and naming

The genus Vrydagzynea was first formally described in 1858 by Carl Ludwig Blume and the description was published in his book Collection des Orchidées les plus remarquables de l'archipel Indien et du Japon.[1][7] The name Vrydagzynea honours the Dutch pharmacologist Theodore Daniel Vrydag Zynen, a contemporary of Blume.[6]

List of species

The following is a list of species of Vrydagzynea recognised by the World Checklist of Selected Plant Families as at October 2020:[1]

  • Vrydagzynea albida (Blume) Blume - Bangladesh to New Guinea, Indochina, Indonesia, Philippines, Nicobar Islands
  • Vrydagzynea albostriata Schltr. in K.M.Schumann & C.A.G.Lauterbach - New Guinea
  • Vrydagzynea angustisepala J.J.Sm. - Borneo
  • Vrydagzynea argentistriata Carr - Sabah
  • Vrydagzynea argyrotaenia Schltr. in K.M.Schumann & C.A.G.Lauterbach - New Guinea, Solomon Islands, Vanuatu
  • Vrydagzynea beccarii Schltr. - Sarawak
  • Vrydagzynea bicostata Carr - Sabah
  • Vrydagzynea bractescens Ridl. - Sumatra, Borneo
  • Vrydagzynea brassii Ormerod - New Guinea
  • Vrydagzynea buruensis J.J.Sm. - Sulawesi, Maluku
  • Vrydagzynea celebica Schltr. - Sulawesi
  • Vrydagzynea deliana J.J.Sm. - Sumatra
  • Vrydagzynea densa Schltr. - New Guinea
  • Vrydagzynea elata Schltr. - Sabah, Sarawak
  • Vrydagzynea elongata Blume - New Guinea, Maluku and Queensland
  • Vrydagzynea endertii J.J.Sm. - Borneo
  • Vrydagzynea formosana Hayata - Assam, China, Vietnam, Japan
  • Vrydagzynea gracilis Blume - Java, Sumatra
  • Vrydagzynea grandis Ames & C.Schweinf. in O.Ames - Sabah
  • Vrydagzynea guppyi Schltr. - Solomon Islands
  • Vrydagzynea kerintjiensis J.J.Sm - Sumatra
  • Vrydagzynea lancifolia Ridl. - Thailand, Malaysia, Borneo
  • Vrydagzynea micronesiaca Schltr. - Pohnpei
  • Vrydagzynea neohibernica Schltr. - Bismarck Archipelago
  • Vrydagzynea novaguineensis J.J.Sm. - New Guinea
  • Vrydagzynea nuda Blume - Hainan, Hong Kong, Taiwan, Vietnam, Borneo, Java
  • Vrydagzynea obliqua Schltr. - Sulawesi
  • Vrydagzynea paludosa J.J.Sm. - Queensland, New Guinea, Solomon Islands
  • Vrydagzynea pauciflora J.J.Sm. - Borneo
  • Vrydagzynea purpurea Blume - Java
  • Vrydagzynea salomonensis Schltr. in K.M.Schumann & C.A.G.Lauterbach - Vanuatu, Solomon Islands
  • Vrydagzynea samoana Schltr - Vanuatu, Fiji, Samoa
  • Vrydagzynea schumanniana Kraenzl. in K.M.Schumann & C.A.G.Lauterbach - New Guinea
  • Vrydagzynea semicordata J.J.Sm. - Borneo
  • Vrydagzynea sessilifolia Ormerod - New Guinea
  • Vrydagzynea tilungensis J.J.Sm. - Borneo
  • Vrydagzynea triangularis Ormerod & J.J.Wood - Sabah
  • Vrydagzynea tristriata Ridl. - Thailand, Malaysia, Borneo
  • Vrydagzynea truncicola Schltr. - New Guinea
  • Vrydagzynea uncinata Blume - Java
  • Vrydagzynea vitiensis Rchb.f - Vanuatu, Fiji, Samoa, Tonga
  • Vrydagzynea vrydagzynoides (Ames) Ormerod - Leyte
  • Vrydagzynea weberi Ames - Philippines

See also

References
  1. "Vrydagzynea". World Checklist of Selected Plant Families (WCSP). Royal Botanic Gardens, Kew.
  2. Jones, David L. (2006). A complete guide to native orchids of Australia including the island territories. Frenchs Forest, N.S.W.: New Holland. p. 350. ISBN 1877069124.
  3. "Vrydagzynea". Trin keys. Retrieved 4 September 2018.
  4. "Vrydagzynea". Flora of China. Retrieved 4 September 2018.
  5. Pridgeon, Alec M. (ed.); Cribb, Phillip J. (ed.); Chase, Mark W. (ed.); Rasmussen, Finn N. (ed.) (2003). Genera orchidacearum (Volume 3). Oxford: Oxford University Press. pp. 145–150. ISBN 0198507119.CS1 maint: extra text: authors list (link)
  6. "Vrydagzynea". The Orders and Families of Monocots. Retrieved 4 September 2018.
  7. "Vrydagzynea". APNI. Retrieved 4 September 2018.

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