2018 Update: Echinacea hybrids – exPt7

In summer 2018, we searched experimental plot 7 for Echinacea plants that are crosses between and within E. angustifolia and E. pallida. Of the 294 plants originally planted, we found 169. However, for the first time in the history of experimental plot 7, we found a flowering plant (an E. pallida x pallida cross)! The table below shows the counts of Echinacea plant in the summer of 2018. In addition to the lowest survivorship, the native E. angustifolia also has been the smallest (above-ground) over the five experimental years. Uh oh!

Riley with the first ever flowering head in exPt7!


Status 2018 ang x ang ang x pal pal x ang pal x pal
not found 52 12 26 35
found 22 16 59 72


Start year: Crossing in 2012, Planting in 2013

Location: Hegg Lake Wildlife Management Area – Experimental Plot 7

Overlaps with: Echinacea hybrids: exPt6Echinacea hybrids: exPt9

Data collected: Rosette number, leaf number, length of longest leaf, herbivory for each plant collected electronically and exported to CGData. Recheck information for plants not found was also collected electronically and stored in CGData. In 2018, Riley also used a Li-Cor 6400 to analyze ecophysiological traits of Echinacea in expt7. This included photosynthetic rate and water use efficiency. Riley has this data and we’ll make it available after he’s done with his thesis.

Products: Riley’s 2018-19 Biology Honors Project at Gustavus. Riley found that within-species Echinacea angustifolia crosses have lower survivorship, above-ground biomass, and ecophysiological traits than other cross types. Riley made a poster, is writing his thesis, and will defend it in May.

You can read more about rexPt7, as well as links to prior flog entries mentioning the experiment, on the background page for this experiment.


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