Chenopodium strictum

Chenopodium missourienseP Chenopodium pedunculareP Chenopodium polyspermum Chenopodium strictum var. glaucophyllum Conyza bonariensis (or Erigeron bonariensis)... 

Chenopodium strictum Roth var. glaucophyllum (Aellen) H.A.Wahl Chloris barbata Sw. 

In Chenopodium strictum there seems to be no fitness difference between resistant and susceptible individuals (9). C. strictum is a very slow-growing species and it is unlikely that photosynthetic electron transport limits its growth. Other cases are more complicated and may be due to various interrelated functions (a) fitness was not measured from germination on (b) there may be density dependent functions (c) there may be different reactions to environmental conditions (d) there may be different germination characters and seed bank dormancies (e) the narrow genetic base of resistant individuals (28-30) is probably detrimental compared to the broad base in the susceptible wild type. 

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