Thứ Bảy, 20 tháng 4, 2013

Lycaste

Lycaste, abbreviated as Lyc in horticultural trade, is a genus of orchids that contains about 30 species with egg-shaped pseudobulbs and thin, plicate (pleated) leaves.

Taxonomy

The World Checklist of Selected Plant Families, maintained by the Royal Botanic Gardens at Kew, is recognized by the American Orchid Society as the definitive authority on orchid taxonomy. The Checklist currently acknowledges 31 species of Lycaste, 3 natural hybrids, 2 subspecies (and 1 nominate subspecies), and 1 variety. Orchid growers and orchid collectors, who tend to be taxonomic "splitters" more often than "lumpers" (see lumpers and splitters), recognize additional subspecies and varieties of Lycaste, as well as alba (white) forms of several species.
The Lycastes have been divided into four sections, one of which has two subsections:
  • Section Deciduosae - deciduous, that is, they usually lose their leaves during an annual dormant period
    • Subsection Xanthanthae - have yellow to orange blooms; the name is from xantho - yellow, and anthos - flower
    • Subsection Paradeciduosae - have pink-marked white blooms; the name is from para- similar or near, and deciduosae- deciduous ones
  • Section Longisepalae - has very long sepals
  • Section Macrophyllae - keep their leaves during dormancy; the name is from macro- large and phyllae- leaves
  • Section Fimbriatae - typically have fringed lips
All but two of the Deciduosae have spines at the apices of their pseudobulbs, that become exposed when the leaves are dropped - the exceptions are a Xanthanthae species, Lycaste lasioglossa, and a Paradeciduosae species, Lycaste tricolor. Both of these species lack spines, and may bloom when leaves are still present.
Lycaste Cassipeia "Autumn glow" (a cultivar)
The recognized Xanthanthae species include:
The Paradeciduosae species include:
The Macrophyllae form a large complex, with subspecies and varieties that can be considered to be in the process of differentiating into new full species. The Macrophyllae species include:
Lycaste xytriophora
L. dowiana
The Fimbriatae species include:
Natural hybrids :
  • Lycaste × groganii (Lycaste aromatica × Lycaste deppei)
  • Lycaste × michelii (Lycaste cochleata × Lycaste lasioglossa)
  • Lycaste × smeeana (Lycaste deppei × Lycaste skinneri)
Hybrids
  •  Lycaste Cassiopeia - 'Wyldlips' x Auburry 'Ditchling'
  • Angulocaste (Anguloa x Lycaste)
  • Cochlecaste (Cochleanthes x Lycaste)
  • Colaste (Colax x Lycaste)
  • Lycasteria (Bifrenaria x Lycaste)
  • Lycida (Ida x Lycaste)
  • Maxillacaste (Lycaste x Maxillaria)
  • Zygocaste (Lycaste x Zygopetalum)
  •  Lycaste-hybrid
  •  
  •  Lycaste Green Valley = L. Leo 'Riopelle'x L. Kansas Yellow
A recently published (2003) revision of Lycaste by Henry Oakeley and Angela Ryan split off most of the species of section Fimbriatae as the new genus Ida. The 34 species of Ida occur in South America or in the Caribbean Islands (Ida barringtoniae), while true Lycastes occur mostly in Mexico and Central America. The genus Ida is recognized by the World Checklist of Monocotyledons.

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