Dahlia: Difference between revisions - Wikipedia

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* '''Group 1 – Single-flowered dahlias''' (''Sin'') – Flower has a central disc with a single outer ring of florets (which may overlap) encircling it, and which may be rounded or pointed.

**(''e.g.'' 'Twyning's After Eight'{{sfn|RHS|2015|loc=[https://www.rhs.org.uk/Plants/219157/Dahlia-Twyning-s-After-Eight-%28Sin%29/Details ''Dahlia'' 'Twyning's After Eight' (Sin)]}})

File:TWYNINGS AFTER EIGHT.jpg|'Twyning's After Eight' (''Single'')

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* '''Group 2 – Anemone-flowered dahlias''' (''Anem'') – The centre of the flower consists of dense elongated tubular florets, longer than the disc florets of Single dahlias, while the outer parts have one or more rings of flatter ray florets. Disc absent.

**(''e.g.'' 'Boogie Woogie'{{sfn|Dave's Garden|2015|loc=[http://davesgarden.com/guides/pf/go/62361/ Anemone Flowered Dahlia ''Dahlia'' 'Boogie Woogie']}})

File:Dahlia 'Boogie Woogie'.jpg|'Boogie Woogie' (''Anemone'')

File:COMETweb.jpg~~|thumb~~|Dahlia "Comet" (''Anemone'')

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File:Collarette Dahlia - "Apple Blossom" cultivar.jpg| 'Apple Blossom' (''Collerette'')

File:FASHION MONGERweb.jpg~~|thumb~~| 'Fashion Monger' (''Collerette'')

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* '''Group 7 – Pompon dahlias''' (''Pom'') – Double spherical miniature flowers made up entirely from florets that are curved inwards (involute) for their entire length (longitudinal axis), resembling a [[pompon]].

**(''e.g.'' 'Small World'{{sfn|RHS|2015|loc=[https://www.rhs.org.uk/Plants/66966/i-Dahlia-i-Small-World-%28Pom%29/Details ''Dahlia'' 'Small World' (Pom)]}})

File:Dahlia - "Small World" cultivar.jpg|'Small World' (''Pompon'')

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* '''Group 8 – Cactus dahlias''' (''C'') – Double blooms, ray florets pointed, with majority [[wikt:revolute|revolute]] (rolled) over more than fifty percent of their longitudinal axis, and straight or incurved. Narrower than Semi cactus.

**(''e.g.'' 'Nuit d'Eté'{{sfn|Dave's Garden|2015|loc=[http://davesgarden.com/guides/pf/go/95672/ Cactus Dahlia ''Dahlia'' 'Nuit D'Ete']}})

File:Dahlia 'Nuit d'Eté'.jpg|'Nuit d'Eté' (''Cactus'')

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* '''Group 9 – Semi cactus dahlias''' (''S–c'') – Double blooms, very pointed ray florets, revolute for greater than twenty five percent and less than fifty percent of their longitudinal axis. Broad at the base and straight or incurved, almost spiky in appearance.

**(''e.g.'' 'Mick's Peppermint'{{sfn|Dave's Garden|2015|loc=[http://davesgarden.com/guides/pf/go/133874/ Semi-Cactus Dahlia ''Dahlia'' 'Mick's Peppermint']}})

File:"Mick's Peppermint" dahlia.jpg|'Mick's Peppermint' (''Semi Cactus'')

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* '''Group 10 – Miscellaneous dahlias''' (''Misc'') – not described in any other group.

**(''e.g.'' [[Dahlia 'Moonfire'|'Moonfire']],{{sfn|RHS|2015|loc=[http://apps.rhs.org.uk/plantselector/plant?plantid=623 ''Dahlia'' 'Moonfire' (Misc/DwB)]}} 'Carolina Burgundy')

File:DahliaMoonfire.jpg|''[[Dahlia 'Moonfire'|'Moonfire']]'' (''Miscellaneous'')]]

File:Dahlia-1.jpg| Hybrid

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* '''Group 11 – Fimbriated dahlias''' (''Fim'') – ray florets evenly split or notched into two or more divisions, uniformly throughout the bloom, creating a [[fimbriated]] (fringed) effect. The petals may be flat, involute, revolute, straight, incurving or twisted.

**(''e.g.'' 'Marlene Joy'{{sfn|RHS|2015|loc=[https://www.rhs.org.uk/Plants/109241/Dahlia-Marlene-Joy-%28Fim%29/Details ''Dahlia'' 'Marlene Joy' (Fim)]}})

File:Dahlia Marlene Joy.JPG|'Marlene Joy' (''Fimbriated'')

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* '''Group 12 – Single Orchid (Star) dahlias''' (''SinO'') – single outer ring of florets surround a central disc. The ray florets are either involute or revolute.

**(''e.g.'' 'Alloway Candy'{{sfn|Dave's Garden|2015|loc=[http://davesgarden.com/guides/pf/go/99376/ Stellar Dahlia ''Dahlia'' 'Alloway Candy']}})

File:Dahlia 'Alloway Candy'..JPG|'Alloway Candy' (''Single Orchid (Star)'')</gallery>

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* '''Group 13 – Double Orchid dahlias''' (''DblO'') – Double blooms with triangular centres. The ray florets are narrowly lanceolate and are either involute or revolute. The central disc is absent.

**(''e.g.'' 'Pink Giraffe'{{sfn|National Dahlia Collection|2015|loc=[http://www.dahliaworld.co.uk/douborch.htm Double Orchid Dahlias. Pink Giraffe]}}{{sfn|RHS|2015|loc=[https://www.rhs.org.uk/Plants/53441/i-Dahlia-i-Pink-Giraffe-%28DblO%29/Details ''Dahlia'' 'Pink Giraffe' (DblO)]}})

File:Dahlia - "Pink Giraffe" cultivar.jpg|'Pink Giraffe' (''Double Orchid'')

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* '''Group 14 – Peony-flowered dahlias''' (''P'') – Large flowers with three or four rows of rays that are flattened and expanded and arranged irregularly. The rays surround a golden disc similar to that of Single dahlias.

**(''e.g.'' [[Dahlia 'Bishop of Llandaff'|'Bishop of Llandaff']]{{sfn|RHS|2015|loc=[https://www.rhs.org.uk/plants/details?plantid=621 ''Dahlia'' 'Bishop of Llandaff' (P)]}})

File:DahliaLlandaff.jpg|'[[Dahlia 'Bishop of Llandaff'|'Bishop of Llandaff' (''Peony'')]]

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;Flower size

Earlier versions of the registry subdivided some groups by flower size. Groups 4, 5, 8 and 9 were divided into five subgroups (A to E) from Giant to Miniature, and Group 6 into two subgroups, Small and Miniature. Dahlias were then described by Group and Subgroup, ''e.g.'' 5(d) ‘Ace Summer Sunset’.{{sfn|RHS|2015|loc=[https://www.rhs.org.uk/plants/pdfs/Plant-register-supplements/Dahlias/13th-Dahlia-Supplement The International Dahlia Register 1969. Thirteenth Supplement (2002)]}} Some Dahlia Societies have continued this practice, but this is neither official nor standardised. As of 2013 The RHS uses two size descriptors{{sfn|RHS|2015|loc=[https://www.rhs.org.uk/plants/pdfs/Plant-register-supplements/Dahlias/24th-dahlia-supplement The International Dahlia Register 1969. Twenty-fourth Supplement (2014)]}}

* '''Dwarf Bedder (Dw.B.)''' – not usually exceeding {{convert|600|mm|in|abbr=on}} in height, ''e.g.'' 'Preston Park' (''Sin/DwB''){{sfn|RHS|2015|loc=[https://www.rhs.org.uk/Plants/66186/i-Dahlia-i-Preston-Park-%28Sin-DwB%29/Details ''Dahlia'' 'Preston Park' (Sin/DwB)]}}

* '''Lilliput dahlias (Lil)''' – not usually exceeding {{convert|300|mm|in|abbr=on}} in height, with single, semi-double or double florets up to {{convert|26|mm|in|abbr=on}} in diameter. ("baby" or "top-mix" dahlias), ''e.g.'' 'Harvest Tiny Tot' (''Misc/Lil''){{sfn|RHS|2015|loc=[https://www.rhs.org.uk/Plants/116490/Dahlia-Harvest-Tiny-Tot-(Misc-Lil)/Details ''Dahlia'' 'Harvest Tiny Tot' (Misc/Lil) ]}}

Sizes can range from tiny micro dahlias with flowers less than 50mm to giants that are over 250mm in diameter. The groupings listed here are from the New Zealand Society:{{sfn|NDSNZ|2015|loc=[http://www.nzdahliasociety.50megs.com/varieties.html Dahlia varieties]}}