extensive dense mat of lesser celandine - ficaria verna

animals april botany buttercup cattle celandine connecticut conservation cover dense dormancy early effects england environmental extensive fairfield fatal ficaria field fig floodplain flowers ground harbinger horses horticulture identification impact introduced invasive leaves lesser livestock mat may native nature negative new outcompetes overtaking pilewort plant plants poisonous preservation pretty research sheep species spring this toxic usda verna very wetlands