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IPM1023, Missouri Weed Seeds

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Missouri Weed Seeds

Asclepiadaceae (Milkweed family)

Broadleaf plant family

All members of this plant family are known as milkweeds. There are at least 15 species of milkweeds that occur in the state.

Cocklebur, common Cocklebur, common
Xanthium strumarium

Dandelion Dandelion
Taraxacum officinale

Dock, prairie Dock, prairie
Silphium terebinthinaceum

Eclipta Eclipta
Eclipta prostrata

Galinsoga, hairy Galinsoga, hairy
Galinsoga ciliata

Goldenrod, CanadaGoldenrod, Canada
Solidago canadensis

Goldenrod, tall Goldenrod, tall
Solidago altissima

Groundsel, common Groundsel, common
Senecio vulgaris

Horseweed Horseweed
Conyza canadensis

Ironweed, tall Ironweed, tall
Vernonia altissima

Ironweed, western Ironweed, western
Vernonia baldwinii

Lettuce, prickly Lettuce, prickly
Lactuca serriola

Lettuce, tall Lettuce, tall
Lactuca canadensis

Milkweed, common Milkweed, common
Asclepias syriaca

Milkweed, eastern whorled Milkweed, eastern whorled
Asclepias verticillata

Milkweed, green Milkweed, green
Asclepias hirtella

Milkweed, honeyvine Milkweed, honeyvine
Ampelamus albidus

Ragweed, common Ragweed, common
Ambrosia artemisiifolia

Ragweed, giant Ragweed, giant
Ambrosia trifida

Ragweed, lanceleaf Ragweed, lanceleaf
Ambrosia bidentata

Rosinweed, cup Rosinweed, cup
Silphium perfoliatum

Rosinweed, wholeleaf Rosinweed, wholeleaf
Silphium integrifolium

Salsify, western Salsify, western
Tragopogon dubius

Snakeroot, white Snakeroot, white
Eupatorium rugosum

Sowthistle, annual Sowthistle, annual
Sonchus oleraceus

Sowthistle, spiny Sowthistle, spiny
Sonchus asper

Spanishneedles Spanishneedles
Bidens bipinnata

Sunflower, common Sunflower, common
Helianthus annuus

Thistle, bull Thistle, bull
Cirsium vulgare

Thistle, Canada Thistle, Canada
Cirsium arvense

Thistle, field Thistle, field
Cirsium discolor

Thistle, musk Thistle, musk
Carduus nutans

Thistle, Scotch Thistle, Scotch
Onopordum acanthium

Thistle, tall Thistle, tall
Cirsium altissimum

For an idea of relative seed size, each photo contains a millimeter ruler. The distance between increments is 1 mm.

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IPM1023 Missouri Weed Seeds | Page 9 | University of Missouri Extension