The APG III system of 2009 used the broader definition of the group,[4] treating it as the subfamily Hemerocallidoideae of the family Xanthorrhoeaceae sensu lato.[5] In the APG IV system of 2016 the name Asphodelaceae is used in preference to Xanthorrhoeaceae.[1]
In 1985, Dahlgren, Clifford, and Yeo produced a work on monocot taxonomy that remained influential for over two decades.[8] They defined Hemerocallidaceae as consisting only of Hemerocallis. They excluded Phormium and its relatives, placing them into a separate family, Phormiaceae. This treatment was followed by Armen Takhtajan in 2009, in a classification that was based almost entirely on morphology and that recognized paraphyletic groups. It was not followed in a major work on monocot taxonomy which appeared in 1998.[9]
In the 21st century, Hemerocallidaceae has been defined in essentially two different ways in systems based on monophyletic groups.[2] In the narrower of these circumscriptions, Hemerocallidaceae sensu stricto, it consists of 12 genera and 40 to 50 species.[6] It does not include the 8 genera and about 38 species that are placed in a separate family, Johnsoniaceae.[10]
The broader version of the family, Hemerocallidaceae sensu lato, includes those species that would otherwise be assigned to Johnsoniaceae. Johnsoniaceae and Hemerocallidaceae sensu stricto form a clade that has strong statistical support. One study found Johnsoniaceae to be embedded in Hemerocallidaceae sensu stricto, but this result did not have strong bootstrap support.[11]
The broader version of Hemerocallidaceae is the one that was accepted by the Angiosperm Phylogeny Group when they published the APG II system in 2003. When this system was superseded by APG III in 2009, Hemerocallidaceae was not recognized, instead being treated as subfamily Hemerocallidoideae of the expanded family Xanthorrhoeaceae sensu lato.[5] In the APG IV system of 2016 the name Asphodelaceae is used in preference to Xanthorrhoeaceae.[1]
As noted above, a broad circumscription of the group includes the two former families Hemerocallidaceae sensu stricto and Johnsoniaceae. The Kubitzki system of 1998 has 12 genera (not counting Xeronema) in Hemerocallidaceae and eight genera in Johnsoniaceae.[9] Some authors combine some of the more closely related genera, recognizing as few as three genera in Hemerocallidaceae sensu stricto and as few as one in Johnsoniaceae.[5] The genera listed below are from the World Checklist of Selected Plant Families, which recognizes 19 genera,[13] with the placement in the subfamily based on APWeb as of December 2010[update].
^ abOle Seberg. 2007. "Hemerocallidaceae" pages 370-371. In: Vernon H. Heywood, Richard K. Brummitt, Ole Seberg, and Alastair Culham. Flowering Plant Families of the World. Firefly Books: Ontario, Canada. ISBN978-1-55407-206-4.
^Ole Seberg. 2007. "Johnsoniaceae" page 376. In: Vernon H. Heywood, Richard K. Brummitt, Ole Seberg, and Alastair Culham. Flowering Plant Families of the World. Firefly Books: Ontario, Canada. ISBN978-1-55407-206-4.
^ abAngiosperm Phylogeny Group (2009), "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG III", Botanical Journal of the Linnean Society, 161 (2): 105–121, doi:10.1111/j.1095-8339.2009.00996.x, hdl:10654/18083
^ abH. Trevor Clifford, Rodney J.F. Henderson, and John G. Conran. 1998. "Hemerocallidaceae" pages 245-253. In: Klaus Kubitzki (editor). 1998. The Families and Genera of Vascular Plants volume III. Springer-Verlag: Berlin;Heidelberg, Germany. ISBN978-3-540-64060-8
^J. Chris Pires, Ivan J. Maureira, Thomas J. Givnish, Kenneth J. Sytsma, Ole Seberg, Gitte Petersen, Jerrold I. Davis, Dennis W. Stevenson, Paula J. Rudall, Michael F. Fay, and Mark W. Chase. 2006. "Phylogeny, genome size, and chromosome evolution of Asparagales". Aliso22(Monocots: Comparative Biology and Evolution):287-304. ISSN0065-6275.
^Rolf M.T. Dahlgren, H. Trevor Clifford, and Peter F. Yeo. 1985. The Families of the Monocotyledons. Springer-Verlag: Berlin, Heidelberg, New York, Tokyo. ISBN978-3-540-13655-2. ISBN978-0-387-13655-4.
^ abKlaus Kubitzki (editor). 1998. The Families and Genera of Vascular Plants volume III. Springer-Verlag: Berlin;Heidelberg, Germany. ISBN978-3-540-64060-8
^H. Trevor Clifford, and John G. Conran. 1998. "Johnsoniaceae" pages 336-340. In: Klaus Kubitzki (editor). 1998. The Families and Genera of Vascular Plants volume III. Springer-Verlag: Berlin;Heidelberg, Germany. ISBN978-3-540-64060-8
^Dion S. Devey, Ilia Leitch, Paula J. Rudall, J. Chris Pires, Yohan Pillon, and Mark W. Chase. "Systematics of Xanthorrhoeaceae sensu lato, with an emphasis on Bulbine". Aliso22(Monocots: Comparative Biology and Evolution):345-351. ISSN0065-6275.
^Dion S. Devey, Ilia Leitch, Paula J. Rudall, J. Chris Pires, Yohan Pillon, and Mark W. Chase. "Systematics of Xanthorrhoeaceae sensu lato, with an emphasis on Bulbine". Aliso22(Monocots: Comparative Biology and Evolution):345-351. ISSN 0065-6275.
Media related to Hemerocallidoideae at Wikimedia Commons
Data related to Hemerocallidoideae at Wikispecies
