The Senecio inaequidens – S. madagascariensis complex (Asteraceae: Senecioneae, subsequently “fireweed complex”) is a group of six southern African species Senecio, three which are considered invasive in various parts the world: South America, Japan, Australia, and Hawaiian Islands, skirrhodon New Zealand, Mexico Europe. Morphological plasticity historically limited access to reliable informati...

The relationship of triazine resistance to decreased plant productivity was investigated in Senecio vulgaris L. F(1) reciprocal hybrids were developed from pure-breeding susceptible (S) and resistant (R) lines. The four biotypes (S, S x R, R, R x S) were compared in terms of atrazine response, electron transport, carbon fixation, and biomass production. Atrazine response, carbon fixation rate, ...