Billygoat-weed

Ageratum conyzoides

"Ageratum conyzoides" is native to Tropical America, especially Brazil, and considered an invasive weed in many other regions. Herb 0.5–1 m. high, with ovate leaves 2–6 cm long, and flowers are white to mauve.
Billygoat-weed - Ageratum conyzoides Cerro de Las Vueltas, Costa Rica. Ageratum conyzoides,Billygoat-weed,Costa Rica,Geotagged,Spring

Naming

In Vietnamese, the plant is called "cứt lợn" due to its growth in dirty areas.
Goatweed flower, Ageratum conyzoides subsp. conyzoides Ageratum conyzoides,Billygoat-weed,Geotagged,Indonesia,Spring

Defense

Ingesting "A. conyzoides" can cause liver lesions and tumors. There was a mass poisoning incident in Ethiopia as a result of contamination of grain with "A. conyzoides". The plant contains the pyrrolizidine alkaloids lycopsamine and echinatine.
Billy Goat weed or Chickweed flower ( Ageratum conyzoides ) Ageratum conyzoides,Billygoat-weed,Geotagged,Indonesia,Summer

Uses

As a medicinal plant, "Ageratum conyzoides" has limited uses due to its toxicity. It is also an insecticide and nematicide.

References:

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Taxonomy
KingdomPlantae
DivisionAngiosperms
ClassEudicots
OrderAsterales
FamilyAsteraceae
GenusAgeratum
SpeciesA. conyzoides
Photographed in
Costa Rica
Indonesia
Malaysia