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Table 1 Effects of CO2 treatment, Latitude of origin, and CO2 × latitude interactions on phase lengths (number of days from: germination to flowering; onset of flowering to senescence; germination to senescence)

From: Northern ragweed ecotypes flower earlier and longer in response to elevated CO2: what are you sneezing at?

Source df df den F Prob > F
Length of pre-flowering phase
 CO2 2 1108 4.358 0.013
 Latitude 2 1108 508.41 <0.001
 Chamber(CO2) 9 1108 3.079 0.001
 Latitude × chamber(CO2) 18 1108 2.02 0.007
 CO2 × latitude 4 1108 3.11 0.015
Length of flowering phase
 CO2 2 1106 2.513 0.081
 Latitude 2 1106 37.9 <0.001
 Chamber(CO2) 9 1106 3.513 0.001
 Latitude × chamber(CO2) 18 1106 2.45 0.001
 CO2 × latitude 4 1106 1.312 0.263
Length of life cycle
 CO2 2 1100 0.7894 0.454
 Latitude 2 1100 327.31 <0.001
 Chamber(CO2) 9 1100 2.71 0.004
 Latitude × chamber(CO2) 18 1100 2.33 0.001
 CO2 × latitude 4 1100 3.572 0.007
  1. For morphological traits, see Table 2