Two phases of invasion: Initial invasion (red) appears to have been in warmer climates. Later in invasion (blue) Johnsongrass has expanded to cooler climates.
On Thursday, at the Weed Science Society of America meeting in Lexington, I presented the results of a large scale survey of phenotypic differentiation in 499 accessions of Johnsongrass (Sorghum halepense) from 70 populations throughout the United States. Jacob Barney — my postdoctoral advisor — was initially scheduled to present, but I took his place when a scheduling conflict prevented his attendance.
I had a great meeting and met a lot of wonderful people. Special congratulations to Kate Venner, Sandeep Rana, and John Brewer from the lab upstairs for their recognitions and accomplishments at the meeting.