Galinsoga quadriradiata (weed)

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Galinsoga quadriradiata (click on image to enlarge it)
Source: Wikimedia Commons

Galinsoga quadriradiata (weed) Cav. - (hairy galinsoga)

Galinsoga quadriradiata (click on image to enlarge it)
Source: Wikimedia Commons

The weed is considered to be native to South America and is now widely distributed, mainly in temperate and subtropical regions. It is an important weed on sandy to loamy soils, affecting low-growing vegetable crops like carrots, onions or lettuce. The plant is sensitive to freezing. It is self or insect pollinated and propagates only by seeds. The seeds are around 1½ mm in diameter, are able to germinate immediately and survive for several years. They disperse by wind, animals or water. There may be 2-3 generations per year.

The plant typically grows to a height of around 20 cm with small flowers (about 5 mm in diameter) and 4-5 white "petals". The "petals" are about as long as the diameter of the flowerhead. The leaf margin is dentate and the stem is densely covered with coarse hairs. It is very similar to Galinsoga parviflora, but is more hairy and has untoothed paleae.

Vernacular names
• Deutsch: Behaartes Knopfkraut
Behaartes Franzosenkraut
• English: hairy galinsoga
shaggy soldier
• Español: cominillo blanco
• Français: galinsoga cilié

Synonyms:
Galinsoga ciliata