Arctium tomentosum Cotton Burdock
Mature Flower Head, Longitudinal Section Regina 21-July-2017
Mature Flower Head, Longitudinal Section
Regina 21-July-2017
Tomentosum: Answers to key questions in Budd's Flora and Flora of Alberta leading to this species.
involucre densely arachnoid-tomentose; NOT [involucre glabrous, sometimes slightly woolly]
corolla glandular