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Dahlia Species |
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| ● About Dahlias |
| ● History |
| ● Species |
| ● Classification |
| ● Family Tree |
| ● Cultivation |
| ● Pests&Diseases |
| ● Naming Rules |
| ● Timeline |
| ● Home |
| The Genus Dahlia was split into 4 sections by Paul Sorensen in 1969 and we use this below to separate the species dahlias as it is and easy system to use however Dayle Saar's recent work has shown that section Pseudodendron and section Dahlia are genetically a section and are only divided at clade level. while section Epiphytum is not valid and belongs with Pseudodendron and some members of the Dahlia section in the variable root clade. | |||||||||
| GENUS: Dahlia | |||||||||
| Section | Section | Section | Section | ||||||
| Pseudodendron (tree dahlias) | Epiphytum (Vine Dahlia) |
Entemophyllon | Dahlia | ||||||
| The Genus Dahlia with indication of sections and all recognized species. The species are arranged below as in Sorensen (1969) with additional species, established later than then, placed afterwards. | |||||||||
| A. section Pseudodendron (tree dahlias, base of stem woody, pinnules opposite): | |||||||||
| 1. D. excelsa §= the identity of this species is uncertain. Dahlia excelsa |
2. D. imperialis |
3. D. tenuicaulis Dahlia tenuicaulis  |
31.D. campanulata, Dahlia campanulata |
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| B. section Epiphytum (climbers, pinnules opposite): | |||||||||
4.D. macdougallii (True Vine Dahlia) ougallii (True Vine Dahlia) Status Endangered  |
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| C. section Entemophyllon (herbaceous or subshrubs, pinnules alternate): | |||||||||
5. D. scapigeroides 6. D. foeniculifolia |
7. D. linearis 8. D. rupicola |
D. dissecta 10.D. congestifolia, (extinct?) ( linearis & scapigroides hybrid?) 36.D. sublignosa |
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| D. Section Dahlia (herbaceous, pinnules opposite): | |||||||||
11. D. merckii 12. D. apiculata (Known as the Vine Dahlia in the USA) 13. cordifolia (previously known under the name D. cardiophylla) 14. D. pusii (extinct?) 15. D. sorensenii (Wrongly labelled as Dahlia pinnata in most botanical gardens) 16. D. eropoda |
17. D. brevis 18. D. rudis 19. D. moorei 20. D. mollis 21. D. hintonii (extinct?) 22. D. ropurpurea |
23. D. australis 24. D. sherffii 25. D. scapigera 26. D. barkerae 27. D. tenuis 28. D. coccinea |
29. D. tubulata, 30. D. parvibracteata, 32. D. hjertingii, 33. D. spectabilis, 34. D. cuspidata, 35. D. neglecta, |
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.jpg "click to see larger picture") Dahlia merckii |
.jpg "click to see larger picture") Dahlia rudis |
 Dahlia australis |
.jpg "click to see larger picture") Dahlia hjertingii |
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.jpg "click to see larger picture") Dahlia sorensenii |
 Dahlia barkerae |
.jpg "click to see larger picture") Dahlia spectabilis |
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.jpg "click here to see larger picture")  Dahlia coccinea |
Dahlia sp. from Guatemala |
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| The Garden dahlia has arisen from hybridising several specie dahlias together. In the past the Garden Dahlia has been given scientific names all of which are not valid. below is the correct way to referring to cultivars however in referring to the garden dahlia in general in scientific literature it would be advisable to use Dahlia hortensis rather than varabilis. The name varabilis refers to a particular cross that took place between 1791-1805. | |||||||||
| Dahlia "Cultivar" e.g.. Dahlia "Mary's Jomanda" Dahlia x hortensis ______________________________The Garden Dahlia |
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| Previous names used for dahlia hybrids **. Dahlia pinnata_______________ D.sorensenii x D.coccinea Hans V.Hansen & JP Hjerting **. Dahlia varabilis______________ D.pinnata (D.sorensenii x D.coccinea) x D.sp Richard K.Cook |
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