Relates to: Weeds
Relates to: Weeds
Photo 5. Close-up flowerhead cluster, goatweed, Ageratum conyzoides. Note, each flowerhead surrounded by green, leaf-like structures.
Goatweed; it is also known as billygoat weed (or billy goat weed, even billy-goat weed), tropic ageratum, blue flowered groundsel.
Ageratum conyzoides. It has been known previously by a large number of different names. It is also said to be Ageratum conyzoides subspecies conyzoides. It is a member of the Asteraceae.
A similar species, Ageratum houstonianum, is recorded in the Pacific islands (Fiji, French Polynesia, New Caledonia, Papua New Guinea).
AUTHORS Grahame Jackson, Aradhana Deesh & Mani Mua
Adapted from Billygoat weed (Ageratum conyzoides) (2018) Weeds of SE Qld and Northern NSW. Lucidcentral. (https://www.lucidcentral.org/editors-pick-animal-and-plant-identification-keys/key-to-weeds-of-se-qld-and-northern-nsw); and additional information from CABI (2019) Ageratum conyzoides (billy goat weed). Invasive Species Compendium. (https://www.cabi.org/isc/datasheet/3572#tosummaryOfInvasiveness). Photos 1,2,5&10 Sheldon Navie, Queensland, Australia. Photo 4 Minghong Photo of Ageratum conyzoides. Photos 8&9 Forest & Kim Starr. Starr Environmental, Bugwood.org.
Produced with support from the Australian Centre for International Agricultural Research under project HORT/2016/185: Responding to emerging pest and disease threats to horticulture in the Pacific islands, implemented by the University of Queensland, in association with the Pacific Community and Koronivia Research Station, Ministry of Agriculture, Fiji.
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