Cypripedium tibeticum

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Cypripedium tibeticum
Cypripedium tibeticum 1.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Cypripedioideae
Genus: Cypripedium
Species:
C. tibeticum
Binomial name
Cypripedium tibeticum
King ex Rolfe (1892)
Synonyms [1] [2]
  • Cypripedium corrugatumFranch. (1894)
  • Cypripedium corrugatum var. obesumFranch. (1894)
  • Cypripedium macranthos var. tibeticum(King ex Rolfe) Kraenzl. (1897)
  • Cypripedium langrhoaCostantin (1919)
  • Cypripedium lanuginosumSchltr. 1919
  • Cypripedium compactumSchltr. (1922) illegitimate
  • Cypripedium froschiiPerner 1999
  • Cypripedium tibeticum var. froschii(Perner) Eccarius 2009

Cypripedium tibeticum is a species of slipper orchid in the section Cypripedium in the subsec. Macrantha [3] It is native to Bhutan, Sikkim, and Western China (Gansu, Guizhou, Sichuan, Tibet, Yunnan). [1] [2]

Contents

Description

C. tibeticum reaches a height of 13-35 cm. Its leaves are 3, 7-15 cm by 3.3-7.2 cm and are glabrous (lacking hairs) on both surfaces except towards the tips. Each inflorescence carries one flower, produced usually before the leaves have fully developed, and the bract sheathing the pedicel is 5–10.5 cm long. The flower is sub-nodding and very variable in colour from deep maroon to pink. The ovary is glabrous or rarely slightly pubescent or papillose towards the apex, 2–3.2 cm long. The sepals are 3–5.2 cm by 1.8-3 cm, and the petals are 3.6-6 cm by 1.4-2.5 cm. The pouched labellum is 3.5-6 cm long and wide, and the margins of the mouth are crimped all around, the outer surface usually wrinkled. Flowering occurs from May to July. [3]

This species is notably variable across its distribution and sometimes it is hard to distinguish from other species such as Cypripedium macranthos or Cypripedium calcicola . The main distinction from C. macranthos is the darker flower colour, especially when dried-pressed. [4]

Distribution and habitat

C. tibeticum occurs in Sikkim, Bhutan and western China (Xizang, Yunnan, Sichuan and possibly S. Gansu). It grows in open montane meadows, margins of coniferous and mixed woodlands, open limestone ledges and screes at elevations of 2300-4600 m. [3] These plants usually form large clumps or colonies.

Taxonomy and naming

Seven specimens collected in southeastern Xizang may suggest natural hybridisation with Cypripedium himalaicum . [4] This orchid is also a parent of Cypripedium × wenqingiae , an hybrid between C. farreri and C. tibeticum.

Cultivation

Together with its close relatives, this species replaces C. macranthos in southwestern China and the Himalayan region, and requires growing conditions similar to the latter in some respects. It differs in being more adapted to continental high mountain regions. Hence it needs some protection in winter, especially during frost-free periods, to maintain dormancy. It should not receive too much rain in winter. In summer, it needs constant watering and a fresh and cool atmosphere while receiving full light (avoid the burning sun around noon). It can acclimatise in gardens, but will not grow into big clumps nor become as persistent as C. macranthos. In the wild it is found growing in grassland on limestone and should have a compost with a pH between 6 and 7. It is not a beginner's species. Mixes A, B, C, D (made with coarse sand and some oyster shells), and J. [4]

Mix A: One part loam pellets, one part Seramis (or comparable materials like pumice gravel), one part rotten wood, and one part coarse sand.

MixFormulae
Mix AOne part loam pellets, one part Seramis (or comparable materials like pumice gravel), one part rotten wood, and one part coarse sand.
Mix BPure washed pumice gravel or lava gravel 3-8 mm diameter.
Mix CPure ungraded pumice gravel (unwashed).
Mix DFour to five parts fine dune sand (from inland dunes) and one part fen soil (muck). Add just enough fen soil to make the sand dark grey. With calcareous-growing species, if lime-free sand is used, powder with agricultural lime (preferably dolomitic) over the surface every autumn.
Mix JTwo parts gravel, one part perlite, and one part fine fir bark. To lift the pH into the neutral range, if needed, add ½ part oyster shells.

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References

  1. 1 2 Flora of China v 25 p 27, 西藏杓兰 xi zang shao lan, Cypripedium tibeticum
  2. 1 2 Kew World Checklist of Selected Plant Families
  3. 1 2 3 Frosch, Werner; Cribb, Phillip (2013). Hardy Cypripedium: Species, Hybrids and Cultivation. Kew Publishing. ISBN   978-1-84246-464-9.
  4. 1 2 3 Cribb, Phillip; Kew, Royal Botanic Gardens (1997). The Genus Cypripedium. Timber Press. ISBN   978-0-88192-403-9.
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