Galinsoga parviflora is an herbaceous plant in the Asteraceae (daisy) family. It has several common names including guasca (Colombia), mielcilla (Costa Rica), galinsoga (New Zealand) or gallant soldiers (United Kingdom, United States). 
Galinsoga parviflora was brought from Peru to Kew Gardens in 1796, and later escaped to the wild in Great Britain and Ireland, being temporarily known as the 'Kew Weed'. The plant is named after the Spanish botanist Ignacio Mariano Martinez de Galinsoga. The species name 'parviflora' translates to 'having small flowers'. In Britain, its name Galinsoga is sometimes popularly rendered as "gallant soldiers", and then sometimes altered to "soldiers of the Queen". In Malawi, where the plant is naturalised, it is known as 'Mwamuna aligone' which translates to 'My husband is sleeping'.
Galinsoga parviflora grows to a height of 75 cm (30 inches). It is a branched herb with opposite stalked leaves, toothed at the margins. The flowers are in small heads. The 3-8 white ray-florets are about 1 mm (0.4 inches) long and 3-lobed. The central disc florets are yellow and tubular.
The species is native to South America, however it is widely naturalised in other countries. There are a few records of G. parviflora and G. ciliata in Northern Ireland. It has been naturalized elsewhere, including North America and Australia.
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- Flora of China, Galinsoga parviflora Cavanilles, 1795. 牛膝菊 niu xi ju
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- Photo of herbarium specimen at Missouri Botanical Garden, collected in Brazil in 1987
- Photo of herbarium specimen at Missouri Botanical Garden, collected in Dominican Republic in 2006
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