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Chysis is a genus of orchids (family Orchidaceae). Only two or three of these are commonly found in cultivation. The genus is abbreviated Chy in trade journals.
The genus consisting of about 5 species which originate from Mexico to Peru. Chysis are epiphytic and grow under shady and damp conditions up to 1000 meters elevation.
The genus is typified by elongate, spindle-shaped, usually pendulous pseudobulbs of several internodes, which may be fat or slender, depending on the species. The leaves tend to be quite soft and papery, strongly ribbed and long. The leaves can take a good deal more light than is apparent from their thickness. This genus also tends to be partially deciduous, though leaves are often retained for two years.
The inflorescences are multi-flowered and arise from the base of the pseudobulb with the new growth. Flower colour tends to range from white (as in Chysis bractescens) to orange-yellow (as in Chysis aurea and Chysis laevis), and the pollinia often tend to be fused (hence the genus name Chysis which is Greek for "melting").
The plants should be grown under moderate lighting and intermediate temperature conditions, generally mounted due to their pendulous habit, though some species adapt well to pot culture. The plants should be watered and fed heavily while they are in active growth, though rather less once the seasons growth is completed. They should never be allowed to completely dry out, however, even during the rest period, and the pseudobulbs should never be seen to shrivel.
- Thorvaldsenia Leibm. ex Hartman 1844
- Thorwaldsenia Leibm. ex Hartman 1844
- Chysis addita Dressler, (2000).
- Chysis aurea Lindl., (1837).
- Chysis bractescens Lindl., (1840).
- Chysis bruennowiana Rchb.f. & Warsz., (1857).
- Chysis laevis Lindl., (1840).
- Chysis limminghei Linden & Rchb.f., (1858).
- Chysis orichalcea Dressler, (2000)
- Chysis pluricostata Dressler, (2006).
- Chysis tricostata Schltr., (1922).
- Chysis violacea Dressler, (2003).
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