Subdivision Dahlia

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1 subdivision

1.1 infrageneric subdivision

1.1.1 sections
1.1.2 species







subdivision
infrageneric subdivision

sherff (1955), in first modern taxonomy described 3 sections 18 species recognised, pseudodendron, epiphytum , dahlia. 1969 sørensen recognised 29 species , 4 sections splitting off entemophyllon section dahlia. contrast giannasi (1975) using phytochemical analysis based on flavonoids, reduced genus 2 sections, entemophyllon , dahlia, latter having 3 subsections, pseudodendron, dahlia, , merckii. sørensen issued further revision in 1980, incorporating subsection merckii in original section dahlia. when described 2 new species in 1980s (dahlia tubulata , d. congestifolia), placed them within existing sections. further species, dahlia sorensenii added hansen , hjerting in (1996). @ same time demonstrated dahlia pinnata should more designated d. x pinnata. d. x pinnata shown variant of d. sorensenii had acquired hybrid qualities before introduced europe in sixteenth century , formally named cavanilles. original wild d. pinnata presumed extinct. further species continue described, saar (2003) describing 35 species. separation of sections on morphological, cytologal , biocemical criteria has not been entirely satisfactory.


to date these sectional divisions have not been supported phylogenetically, demonstrate section entemophyllon distinct sectional clade. other major grouping core dahlia clade (cdc), includes of section dahlia. remainder of species occupy has been described variable root clade (vrc) includes small section pseudodendron monotypic section epiphytum , number of species within section dahlia. outside of these 3 clades lie d. tubulata , d. merckii polytomy.


horticulturally sections retain usage, section pseudodendron being referred tree dahlias , epiphytum vine dahlia . remaining 2 herbaceous sections being distinguished pinnules, opposing (dahlia) or alternating (entemophyllon).


sections

sections (including chromosome numbers), geographical distribution;



epiphytum sherff (2n = 32)

10 m tall climber aerial roots 5 cm thick , more 20 m long; pinnules opposite
1 species, d. macdougallii sherff
mexico: oaxaca


entemophyllon p. d. sorensen (2n = 34)

6 species
mexico: hidalgo, nuevo león, tamaulipas, querétaro, durango, san luis potosí


pseudodendron p. d. sorensen (2n = 32)

3 species + d. excelsa of uncertain identity
mexico: chiapas, guerrero, jalisco, michoacan, oaxaca, , costa rica, el salvador, guatemala & colombia


dahlia (2n = 32, 36 or 64)

24 species
mexico: distrito federal, guerrero, hidalgo, morelos, nuevo león, puebla, san luis potosí, tamaulipas, veracruz, oaxaca, puebla, chiapas, méxico, huehuetenango, chihuahua, durango, michoacan & guatemala



only pseudodendron (d. imperialis) , dahlia (d. australis, d. coccinea) occur outside mexico.


species

there 42 accepted species in dahlia genus, new species continue described.








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