Swaziland's Alien Plants Database

Sonchus asper (L.) Hill subsp. asper  (Sonchus asper) (Sonchus gigas) ASTERACEAE rough sowthistle, prickly sowthistle, spiny sowthistle Unknown, Minor problem species Origin: Growth Form: Herb Plant Description: Erect, annual herb up to 0.8 m high with well developed fibrous taproots. Leaves alternate, margins spiny. Key Features: Control: Comments: More information: NRCS Plants Database Illustration USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913. Illustrated flora of the northern states and Canada. Photo - flowers/leaves William S. Justice @ USDA-NRCS PLANTS Database Photo - flowers Clarence A. Rechenthin @ USDA-NRCS PLANTS Database Photo - flowers/leaves Robert H. Mohlenbrock @ USDA-NRCS PLANTS Database / USDA SCS. 1989. Midwest wetland flora: Field office illustrated guide to plant species. Midwest National Technical Center, Lincoln, NE. Photo - plant K Braun, Swaziland's Alien Plants Database Photo - flowers/leaves K Braun, Swaziland's Alien Plants Database Photo - plant The Weeds Society of Western Australia

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