Note the hairy margin of leaves and hairy sheath (3rd photo)
Best guess. Leaves hairy on both sides, tapering at base with decurrent leaf tissue along petiole which is eglandular. Sepals lacerate. I could not find any thorns at all. Veins impressed which points toward C. succulenta (also in Series Macracanthae)
Hawthorn Tree (unsure of ID) in Van Hull Park, Winnipeg, Manitoba, Canada