Stand of mountain ash Eucalyptus regnans, photographed by Michael Ryan.

Belongs within: Eucalypteae.

Eucalyptus is a large genus of more than 700 species of trees and shrubs, mostly native to Australia (with a very few reaching into insular south-east Asia). Many species in the genus are also grown outside their native range as timber trees. Many species of Eucalyptus have well-developed oil glands on the leaves that give them a very characteristic scent, and vapour from this oil has long been used to relieve colds and other mucus build-ups. However, the flammability of eucalyptus oil can exacerbate the spread of fire in eucalyptus forests; the trees themselves can often recover from fires by the production of epicormic growth from beneath burnt bark. The mountain ash Eucalyptus regnans, found in Tasmania and Victoria, is one of the world's tallest tree species. Eucalyptus species that are multi-stemmed from ground level are commonly referred to as 'mallees'.

The name 'Eucalyptus', meaning 'true covering', refers to the operculum that covers the stamens and ovary during flower development before being shed at maturity. In members of the subgenus Symphomyrtus, a double operculum is present with the outer operculum being shed early in development. In the subgenus Eucalyptus, only a single operculum is present at any point in development (Boland et al. 2006).

    |--E. subg. Eucalyptus WFM06
    |    |--E. marginata WFM06
    |    |--E. regnans WFM06
    |    `--E. stellulata WFM06
    `--E. (subg. Symphomyrtus) woodwardii WFM06

Eucalyptus incertae sedis:
  E. accedens MCR04
  E. acmenioides H42
  E. alba C78
  E. alipes G04b
  E. amygdalina H42
  E. andreana MH98
  E. annulata G04b
  E. argyphea OS04
  E. aspersa OS04
  E. astringens OS04
  E. bicostata MH98
  E. bleeseri S85
  E. botryoides H42
  E. brachycorys G04a
  E. brevifolia Ho09
  E. bridgesiana H42
  E. caesia TB04
  E. calophylla GK00
  E. calycogona G04b
  E. camaldulensis B08
  E. camphora MH98
  E. capillosa G04b
    |--E. c. ssp. capillosa G04b
    `--E. c. ssp. polyclada G04b
  E. capitellata H42
  E. celastroides G04b
    |--E. c. ssp. celastroides G04b
    `--E. c. ssp. virella G04b
  E. chippendalei B05
  E. cinerea MH98
  E. citriodora H42
  E. cladocalyx H06
  E. cloeziana W95
  E. conferruminata H06
  E. confertiflora C78
  E. conglobata G04b
  E. coriacea H42
  E. cornuta GK00
  E. corymbosa H42
  E. creba W95
  E. curtisii WO05
  E. cylindriflora G04b
  E. cylindrocarpa G04b
  E. cypellocarpa W95
  E. dalrympleana H42
  E. deane W95
  E. decipiens RS04
  E. deglupta C78
  E. delegatensis R96
  E. densa G04b
  E. diversicolor He09
  E. dives H42
  E. dumosa A69
  E. dunni W95
  E. ebbanoensis G04a
    |--E. e. ssp. ebbanoensis G04a
    `--E. e. ssp. glauciramula G04a
  E. elaeophora H42
  E. eremophila G04b
  E. eugenioides H42
  E. ewartiana EF04
  E. exigua G04b
  E. falcata H42
  E. fastigata H42
  E. ficifolia He09
  E. flocktoniae G04b
  E. foecunda B14
  E. formanii G04a
  E. fruticosa KM08
  E. gamophylla EF04
  E. georgei G04b
    |--E. g. ssp. georgei G04b
    `--E. g. ssp. fulgida G04b
  E. gigantea H42
  E. globulus WFM06
  E. gomphocephala He09
  E. gongylocarpa CC03
  E. gracilis W95
  E. grandis WFM06
  E. grasbyi G04a
  E. gratiae G04b
  E. griffithsii G04a
  E. grossa G04b
  E. gummifera B14
  E. gunnii MH98
  E. haemastoma WO05
  E. hayi Ettingshausen 1886 F71
  E. hemiphloia H42
  E. houtmanni Ettingshausen 1886 F71
  E. hybrida SK02
  E. incrassata OS04
    |--E. i. var. incrassata FS54
    `--E. i. var. angulosa FS54
  E. intermedia W95
  E. jacksonii B08
  E. jenseni WF01
  E. kingsmillii BS05
  E. kitsoniana R55
  E. kochii WFM06
    |--E. k. ssp. kochii G04a
    `--E. k. ssp. amaryssia G04a
  E. kombolgiensis S85
  E. kondininensis G04b
  E. latens OS04
  E. lehmannii FS54
  E. leptopoda CWB06
    |--E. l. ssp. leptopoda G04a
    `--E. l. ssp. subluta G04a
  E. leucophloia HD04
  E. leucoxylon B88
  E. livida G04b
  E. longicornis OS04
  E. longifolia H42
  E. loxophleba OS04
    |--E. l. ssp. loxophleba G04b
    `--E. l. ssp. lissophloia G04b
  E. macrorrhyncha B88
  E. maculata W95
  E. maidenii MH98
  E. mannifera HR01
  E. megacarpa GK00
  E. melanophloia H42
  E. melliodora H42
  E. micrantha H42
  E. microcorys H42
  E. microtheca H42
  E. miniata Ho09
  E. mitchellii Ettingshausen 1886 F71
  E. moderata G04a
  E. muelleriana H42
  E. myriadena G04b
  E. myrtella B88
  E. neliodora W95
  E. nitens WFM06
  E. nova-anglica W95
  E. obliqua B88
  E. obtusiflora KM08
  E. occidentalis OS04
  E. oldfieldii G04a
  E. oleosa G04a
    |--E. o. ssp. oleosa G04a
    `--E. o. ssp. repleta G04a
  E. olivina G04b
  E. oraria KM08
  E. oreades W95
  E. ovata W95
  E. paniculata SC04
  E. papuana C78
  E. patens B08
  E. pauciflora KC83
  E. paucifolia F49
  E. pellita H42
  E. peniculata W95
  E. phaenophylla G04b
    |--E. p. ssp. phaenophylla G04b
    `--E. p. ssp. interjacens G04b
  E. phaeotricha W95
  E. phenax OS04
  E. phylacis RS04
  E. pileata G04b
  E. pilularis H42
  E. piperita W95
  E. platypus KM08
  E. pluricaulis OS04
  E. polyanthemos H42
  E. populifolia B88
  E. populnea M64
  E. propinqua H42
  E. protensa G04b
  E. punctata W95
  E. quadrans G04b
  E. racemosa FS09
  E. radiata B88
  E. redunca H42
    |--E. r. var. redunca H42
    `--E. r. var. elata H42
  E. repullulans EF04
  E. resinifera B88
  E. rigidula G04b
  E. robusta HM03
  E. rossii HR01
  E. rostrata B88
  E. rubida H42
  E. rudis B88
  E. rugulata G04b
  E. saligna SC04
  E. salmonophloia B08
  E. salubris G04b
  E. siderophloia H42
  E. sideroxylon H42
  E. sieberiana H42
  E. socialis EF04
  E. sporadica G04b
  E. staeri CW03
  E. striata B88
  E. stuartiana B88
  E. subangusta G04a
  E. subtenuis G04b
  E. tenera G04b
  E. tereticornis H42
  E. terminalis HD04
  E. tessellaris M65
  E. tetrodonta Ho09
  E. thamnoides OS04
    |--E. t. ssp. thamnoides OS04
    `--E. t. ssp. megista OS04
  E. todtiana RL05
  E. transcontinentalis B08
  E. triantha W95
  E. trivalvis EF04
  E. umbellata B88
  E. uncinata OS04
  E. urna G04b
  E. victrix KM08
  E. viminalis H42
  E. wandoo MCR04
  E. xerothermica EF04
  E. yilgarnensis G04b

*Type species of generic name indicated


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