Linnaeus, C. (1 May 1753), Species Plantarum 2: 839 [tax. nov.]

• Type: (not designated).

Linnaeus, C. (1754), Genera Plantarum Edn. 5: 363 [secondary reference]

Mueller, F.J.H. von (1865), Fragmenta Phytographiae Australiae 5(34): 62 [secondary reference]

Bentham, G. (5 January 1867), Orders XLVIII. Myrtaceae- LXII. Compositae. Flora Australiensis 3: 462 [secondary reference]

Mueller, F.J.H. von (1882), Systematic Census of Australian Plants: 77 [secondary reference]

Bailey, F.M. (1913), Comprehensive Catalogue of Queensland Plants: 258 [secondary reference]

Britton, N.L. & Wilson, Percy (31 August 1925), Scientific Survey of Porto Rico and the Virgin Islands 6(2): 286 [secondary reference]

• Type: Ageratum conyzoides L.

Koster, J.T. (1935), The Compositae of the Malay Archipelago. I. Vernonieae and Eupatorieae. Blumea 1(3): 484-491 [secondary reference]

Johnson, M.F. (1971), Annals of the Missouri Botanical Garden 58: 6-88 [secondary reference]

Cronquist, A.J. (1981), An Integrated System of Classification of Flowering Plants: 1025 [secondary reference]

Jacobs, S.W.L. & Pickard, J. (1981), Plants of New South Wales: 71 [secondary reference]

Stanley, T.D. in Stanley, T.D. & Ross, E.M. (1986), Asteraceae. Flora of South-eastern Queensland 2: 503 [secondary reference]

Porteners, M.F. in Harden, G.J. (ed.) (1992), Ageratum. Flora of New South Wales 3: 149 [secondary reference]

Du Puy, D.J., Telford, I.R.H. & Orchard, A.E. (1993), Asteraceae. Flora of Australia 50: 410 [secondary reference]

Green, P.S. in Wilson, A.J.G. (ed.) (1994), Norfolk Island & Lord Howe Island. Flora of Australia 49: 402 [secondary reference]

Cooper, W.E. & Cooper, W.T. (2004), Fruits of the Australian Tropical Rainforest: 79 [secondary reference]

Anderberg, A.A., Baldwin, B.G., Bayer, R.G., Breitwieser, I., Jeffrey, C., Dillon, M.O., Eldenäs, P., Funk, V., Garcia-Jacas, N., Hind, D.J.N., Karis, P.O., Lack, H.W., Nesom, G., Nordenstam, B., Oberprieler, C., Panero, J.J., Puttock, C., Robinson, H., Stuessy, T.F., Susanna, A., Urtubey, E., Vogt, R., Ward, J. & Watson, L.E. in Kubitzki, K. (ed.) (2007), Compositae. The Families and Genera of Vascular Plants 8: 522-523 [secondary reference]

Mabberley, D.J. (1 May 2008), Mabberley's Plant-Book Edn. 3: 21 [secondary reference]

Council of Heads of Australasian Herbaria (2011), Australian Plant Census: - APC [secondary reference]

• APC Dist.: WA (naturalised), ChI (naturalised), NT (naturalised), Qld (naturalised), NSW (naturalised), LHI (naturalised), NI (naturalised)

Orchard, A.E., Cross, E.W. & Bayer, R.J. in Wilson, A.J.G. (ed.) (2015), Ageratum. Flora of Australia 37: 593 [secondary reference]

• Etymology: "an ancient Greek name for a plant, presumably derived from a (not) and geras (old age), possibly because the flowers retain their colour for a long time."

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