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Galinsoga quadriradiata Cav.

Hairy galinsoga, shaggy soldier

KingdomPlantaePlants, but not fungi, lichens, or algae
SubkingdomTracheobiontaVascular plants—plants with a “circulatory system” for delivering water and nutrients
DivisionMagnoliophytaFlowering plants, also known as angiosperms
ClassMagnoliopsidaDicotyledons—plants with two initial seed leaves
SubclassAsteridaeA large class that encompasses asters
OrderAsteralesFlowering plants with a central disk flower and surrounding petals, like daisies
FamilyAsteraceaeThe aster family, which also includes daisies and sunflowers; from the Greek ἀστήρ, “star,” for the star-shaped flowers
GenusGalinsogaNamed for 18th century Spanish doctor and director of Jardin Botanique de Madrid, Ignacio Mariano Martinez de Galinsoga
SpeciesquadriradiataWith four ray florets or with four radiating structures

About plant names...

Hairy galinsoga is a widespread weed that is easily overlooked, with small flowers and few distinctive features, unless you are a farmer and it is ruining your crop yields. These inconspicuous weeds can reduce crop yields by 50%. They are believed to have originated in Mexico.

Identification: Plants are 4-31" (10-80 cm) high, often branched; stems are covered with short hairs. Leaves are opposite, medium to dark green, and up to 2" (6 cm) × 1½" (4 cm). They are broadest at the base, tapering to a tip, sparsely to densely hairy, and coarsely toothed. Flowers are ¼-⅜" (6.3-10 mm) in diameter, with 4 or 5 petals, each with three teeth; and a central yellow disk. Fruits are small achenes with little plumes.


Old, Richard, 1200 Weeds of North America DVD, XID Services, Inc., 2012

Online References:

Discover Life

Illinois Wildflowers

The University of Wisconsin's Robert W. Freckmann Herbarium


The USDA Plants Database

Minnesota Wildflowers


Galinsoga aristulata E.P. Bicknell

Galinsoga bicolorata H. St. John & D. White

Galinsoga caracasana (DC.) Sch. Bip.

Galinsoga ciliata (Raf.) S.F. Blake


Galinsoga quadriradiata description by Thomas H. Kent, last updated 25 May 2020.

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Galinsoga quadriradiata (hairy galinsoga, shaggy soldier)

8/3/2009 · 111 Near 119, Pepperell, Mass­a­chu­setts
≈ 4 × 3½" (9.9 × 8.8 cm)

Galinsoga quadriradiata (hairy galinsoga, shaggy soldier)

(The narrow spikes are crabgrass.) · 10/3/2016 · Lost Lake Area, Groton, Mass­a­chu­setts

Galinsoga quadriradiata (hairy galinsoga, shaggy soldier)

7/18/2019 · Oceanview, Falmouth, Maine
≈ 7 × 4½" (18 × 12 cm)

Galinsoga quadriradiata (hairy galinsoga, shaggy soldier)

8/14/2017 · Beaver Brook Conservation Area, Old Long Loop, Hollis, New Hamp­shire
≈ 5 × 4" (13 × 11 cm)


About this map...