May. 30, 2018

treacle mustard, Erysimum repandum

Treacle mustard plants are not sticky. Perhaps the name reflects their persistent nature. They're a weed that's hard to be rid of.
They've now spread across our globe. Their variability helps account for their success. In one spot they can be tiny plants, taking advantage of the least opening. In another they will be a couple feet tall, crowding across a fallow field. The flowers are more often solid yellow, but may be like this. One plant in the Rockies was tricky to identify because of very pale flowers and unusual height. What is it that makes many plants more enthusiastic out there? Treacle grows in every state except AK, CT, FL, GA, HI, ME, MN, NH, RI, SC, VT, WI, and in BC, ON, and QC. Lenawee Co MI, 5/1/11.