Cenchrus spinifex
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Cenchrus spinifex, known commonly as the common sandbur, coastal sandbur, stickerweed, or stickerbur, is a perennial grass that grows from 5 to 30 inches high in sandy or gravelly terrain. It is nativ
Epizoochory: spiny burs of C. spinifex clinging to clothing on a beach in Vieste, Italy
Noxious weed
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A noxious weed, harmful weed or injurious weed is a weed that has been designated by an agricultural or other governing authority as a plant that is harmful to agricultural or horticultural crops, nat
A mature cotton thistle, an invasive weed in Australia
The alga Caulerpa taxifolia is a noxious marine weed nicknamed killer algae. This is a picture of it invading a native plant bed.
This is a parasitic noxious weed, Striga gesnerioides, commonly called Witchweed.
This is a terrestrial noxious weed, Drymaria arenarioides commonly called Lightning weed. It is sometimes confused with daisies.