Overview

Comprehensive Description

Description

Common epiphyte, often growing in large clusters. Pseudobulbs 3-5 cm apart, growing from a woody rhizome. Variable in size and shape, usually ovoid or pear-shaped, yellow, 2-leaved. Inflorescence erect, up to 20cm long on a thick, swollen, rhachis. Flowers 10-16, set alternately on either side of the rhachis, essentially yellow-green but heavily mottled with purple. This species is very similar to some forms of B. scaberulum but can be distinguished by the longer dorsal sepal, which is normally erect or curved backwards; the filiform petals, which are slightly swollen at the apex; and the lesser number of flowers in the inflorescence.
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Description

Epiphytic or lithophytic herbs with sympodial growth. Pseudobulbs with 1 node, borne on a creeping rhizome with 1-2(-3) leaves at the apex. Leaves usually thick and fleshy. Inflorescence a raceme or umbel (longiflorum), arising from base of pseudobulb. Rhachis sometimes thickened or flattened. Sepals usually free and subequal, the lateral fused to form an obscure mentum. Lip often much smaller than the sepals, hinged to end of column-foot, usually motile, often fleshy and tongue-like. Pollinia 2 or 4 in two pairs.
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage

Barcode of Life Data Systems (BOLD) Stats
                                        
Specimen Records:902Public Records:130
Specimens with Sequences:428Public Species:60
Specimens with Barcodes:136Public BINs:0
Species:434         
Species With Barcodes:60         
          
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Locations of barcode samples

Collection Sites: world map showing specimen collection locations for Bulbophyllum

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Barcode data

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Wikipedia

Bulbophyllum

Bulbophyllum is the largest genus in the orchid family Orchidaceae. With more than 2,000 species, it is also one of the largest genera of flowering plants, exceeded only by Astragalus.[2] This genus is abbreviated in the trade journals as Bulb. It is round throughout most of the warmer parts of the world: Africa, southern Asia, Latin America, the West Indies, and various islands in the Indian and Pacific Oceans.[1]

Biology[edit]

Phylogeny[edit]

This genus was first described by Louis-Marie Aubert du Petit-Thouars (botanical abbreviation Thouars) in his book Histoire particulière des plantes orchidées recueillies sur les trois Iles Australes d’Afrique, de France, de Bourbon et de Madagascar, describing 17 Bulbophyllum species. There are now more than 2,800 records (accepted names and synonyms) for this genus. This large number and the great variety of its forms make the genus a considerable challenge for taxonomists: 120 sections and subgenera have been listed.[3] The scientific name has been derived from the Latin word bulbus (bulb-like) and the Greek word phyllon (leaf), referring to the pseudobulbs on top of which the leaf is growing.[3]

The center of diversity of this genus is in the montane forests of Papua New Guinea (more than 600 species) which seems to be the evolutionary homeland,[4] though the genus is pantropical and widespread, occurring in Australia, Southeast Asia (with over 200 species in Borneo), India, Madagascar (with 135 species, some endemic), Africa and in tropical central and South America.[3]

Structure[edit]

The general characteristics for this genus are : single-noded pseudobulbs, the basal inflorescence and the mobile lip. This genus covers an incredible range of vegetative forms, from tall plants with cane-like stems, to root climbers that wind or creep their way up tree trunks. Other members are pendulous epiphytes (growing on other plants), and quite a number that have developed succulent foliage to a greater or lesser degree. Some species are lithophytic. One species has almost become leafless and uses its pseudobulbs as the organs of photosynthesis.[3]

These orchids with a sympodial growth have rhizomatous stems with often angled pseudobulbs. The thin to leathery leaves are folded lengthwise.[3]

Pollination[edit]

Many Bulbophyllum species have the typical odor of rotting carcasses, and the flies they attract assist in their reproduction through pollination.[3] Nevertheless, there are many species with mild and pleasant floral fragrance attract fruit flies (particularly Bactrocera spp.) via methyl eugenol, raspberry ketone or zingerone that also acts as floral reward during pollination. [5] [6] [7] [8]

The erect to pendent inflorescence arises laterally from the base of the pseudobulb. The flower form has a basic structural blueprint that serves to identify this genus. But this form can be very diverse : compound or single, with few to many flowers, with the resupinate flowers arranged spirally or in two vertical ranks. The sepals and the petals can also be very varied : straight or turned down, without footstalk or with a long claw at the base. They are often hairy or callous. There are two to four hard and waxy pollinia with stipes present or absent. The fruits are beakless capsules.[3]

Cultivation[edit]

The fabulous and bizarre species that comprise this large genus have been the focus of orchid collectors for over a century. The plants require high humidity combined with good air movement and most of them are ever-blooming - flowering continuously throughout the year. They grow best at moderate light levels, but do not in deep shade. They are considered moderate to difficult in cultivation, and require a controlled growing environment to achieve some degree of success. They are not typically suitable as houseplants, and most will not thrive in a wardian case unless they receive adequate air movement.

The plants' growth habit produces widely spaced pseudobulbs along cord-like rhizome sections, and most of these plants are best accommodated on plaques. Some species in this genus can get very large, but most are small to medium-sized epiphytes from warm, moist, humid tropical forests. They can grow continuously year round with no apparent dormancy period if they are kept warm, are moderate feeders in cultivation, and must be kept moist all the time. They can tolerate dryness for short periods, but they have fine root systems which require moist conditions all the time.[9]

Some of the smaller species do well in pots with small-diameter bark substrate. The plants produce very fine roots generally, and the roots are easily damaged. The plants react poorly to disturbance of their roots. They are easy to maintain once a good environment is established with high humidity and a fresh, buoyant, lightly circulating atmosphere being critical. Most of these species cannot tolerate cold temperatures or freezing.[9]

The flowers produce various odors resembling sap, urine, blood, dung, carrion, and, in some species, fragrant fruity aromas. Most are fly-pollinated, and attract hordes of flies. Bulbophyllum beccarii in bloom has been likened to smelling like a herd of dead elephants and both this species and Bulbophyllum fletcherianum are variously described as making it difficult to walk into a greenhouse in which they are being cultivated if the plants are in bloom because of their overpowering floral odors.[9]

Species[edit]

Some species are known for their extreme vegetative and floral forms:

New species are being discovered every year, such as:

Bulbophyllum nocturnum, a species first described in November 2011, is the only orchid known to open its flowers at night and close them during the day.[10][11]

There is one intergeneric hybrid : Triasphyllum (abbr.: Tphm.) (Bulbophyllum x Trias)

Conservation status[edit]

A number of Bulbophyllum species are threatened with extinction, and are recognised as such by the World Conservation Union (IUCN):

Additionally, Bulbophyllum porphyrostachys is listed as near threatened.

Gallery[edit]

References[edit]

  1. ^ a b Kew World Checklist of Selected Plant Families
  2. ^ David G. Frodin (2004). "History and concepts of big plant genera". Taxon 53 (3): 753–776. doi:10.2307/4135449. JSTOR 4135449. 
  3. ^ a b c d e f g The Orchids, Natural History and Classification, Robert L. Dressler. ISBN 0-674-87526-5
  4. ^ Emly S. Siegerist (2001). Bulbophyllums and their allies: a grower's guide. Portland (OR): Timber Press. ISBN 978-0-88192-506-7. 
  5. ^ Tan, K.H. & Nishida, R. (2000) Mutual reproductive benefits between a wild orchid, Bulbophyllum patens, and Bactrocera fruit flies via a floral synomone.Journal of Chemical Ecology 26: 533-546.
  6. ^ Tan, K.H. & Nishida, R. (2005) Synomone or Kairomone? - Bulbophyllum apertum (Orchidaceae) flower releases raspberry ketone to attract Bactrocera fruit flies.Journal of Chemical Ecology 31: 509-519.
  7. ^ Tan, K.H., Tan, L.T. & R.Nishida (2006) Floral phenylpropanoid cocktail and architecture of Bulbophyllum vinaceum orchid in attracting fruit flies for pollination. Journal of Chemical Ecology 32: 2429-2441.
  8. ^ Tan, K.H. (2009) Fruit fly pests as pollinators of wild orchids.Orchid Digest 73(3): 180-187.
  9. ^ a b c Illustrated Encyclopedia of Orchids ISBN 0-88192-267-6
  10. ^ André Schuiteman, Jaap Jan Vermeulen, Ed de Vogel & Art Vogel (2011). "Nocturne for an unknown pollinator: first description of a night-flowering orchid (Bulbophyllum nocturnum)". Botanical Journal of the Linnean Society 167 (3): 344–350. doi:10.1111/j.1095-8339.2011.01183.x. 
  11. ^ Mark Kinver & Victoria Gill (November 22, 2011). "Botanists discover 'remarkable' night-flowering orchid". BBC News. 

Bibliography[edit]

  • J.J. Vermeulen : Orchid Monographs Vol. 7 (1993), A taxonomic revision of Bulbophyllum, sections Adelopetalum, Lepanthanthe, Macrouris, Pelma, Peltopus, and Uncifera (Orchidaceae). iv + 324 pp., 25 text-figs. + 116 full-page line drawings, 6 pp. colour plates. ISBN 90-71236-17-X
  • Siegerist E.S.: - Bulbophyllums and their allies Timber Press, 2001, 77 colour photos, 296 pp ISBN 0-88192-506-3 - devoted solely to Bulbophyllums, it is an introductory guide for amateur and advanced orchid growers.
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Cirrhopetalum

Cirrhopetalum Elizabeth Ann ‘Buckleberry’ 08Nov29a.jpg

Cirrhopetalum, abbreviated as Cirr in hortcultural trade, is a genus of epiphyte orchids (family Orchidaceae, subfamily Epidendroideae). This genus is very closely related to Bulbophyllum and its members have been until recently considered to be in the genus Bulbophyllum. The taxon name comes from Latin cirrus (fringe) and Greek petalon (petal), hence meaning fringed-petaled.

Contents

Description

Plants in this genus are usually small plants with creeping rhizomes. Features that distinguish this genus from Bulbophyllum are:

  • The dorsal sepal of Cirrhopetalum is much smaller than the usually inrolled lateral sepal which has adnate margins.
  • There is generally an umbellate inflorescence which can be upright, pendulous or arching.
  • The pseudobulbs are conical-shaped and obscurely angled with a single spoon-like leaf atop each pseudobulb.

Species

Hybrids

References

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