Swaziland's Alien Plants Database

Conyza bonariensis (L.) Cronquist
ASTERACEAE
fleabane, hairy fleabane, flaxleaved fleabane, horseweed, asthma weed
Disturbed areas, Minor problem species
Origin: Tropical America
Growth Form: Herb
Plant Description: Sub-woody annuals up to 1.2 m high . Lateral branches longer than main axis, flower heads more than 10 mm across, pappus dirty white or pink.
Key Features:
Control: pre-emergence herbicides, post-emergence herbicides must be completed before plant rosette
Comments: Newly exposed receptacles of old heads (2-) 2.5-4.5 mm across, not angular pitted or rarely with 2-3 pits in centre; mature heads 5-6 mm long. c .f. C. sumatrensis: "Newly exposed receptacles of old heads usually 1.5-2.5 (-3) mm across, angular pitted with projecting points at the angles, sometimes pits and pit margins eroded with age; mature heads 4-5 mm long.

Photo - plant



K Braun, Swaziland's Alien Plants Database

Photo - flowers



K Braun, Swaziland's Alien Plants Database

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