Dyer's woad, <i>Isatis tinctoria</i>, silicles on a plant, mostly at the late green-seed pod stage.  Testing has shown that some seeds on plants at this stage are capable of germination.
Dyer's woad, Isatis tinctoria, silicles on a plant, mostly at the late green-seed pod stage. Testing has shown that some seeds on plants at this stage are capable of germination.
Credit: James J. Stapleton