source: CUPIC

Habit of lowbush blueberry, taken in Killarney, Ontario, Canada

Read more about Habit of lowbush blueberry, taken in Killarney, Ontario, Canada

Rhamnus cathartica branches are often thorn tipped. (photo from Illinois)

Read more about Rhamnus cathartica branches are often thorn tipped. (photo from Illinois)

Alder leaved buckthorn habit in Ontario, Canada.

Read more about Alder leaved buckthorn habit in Ontario, Canada.

Southern swamp buttercup, Jackson Co. Illinois

Read more about Southern swamp buttercup, Jackson Co. Illinois

New shoots of Chinkapin oak at Univ. of Guelph, Ontario Canada. Older leaves are less shiny.

Read more about New shoots of Chinkapin oak at Univ. of Guelph, Ontario Canada. Older leaves are less shiny.

Bristle tipped sharp lobed scarlet oak leaves in Jackson Co. Illinois

Read more about Bristle tipped sharp lobed scarlet oak leaves in Jackson Co. Illinois

Distinctive leaves and staminate flowers of swamp white oak in Jackson Co., Illinois

Read more about Distinctive leaves and staminate flowers of swamp white oak in Jackson Co., Illinois

Thin leaved mountain mint (plus beetle) in Illinois.

Read more about Thin leaved mountain mint (plus beetle) in Illinois.

Hoary mountain mint flower. Note hairs & whitish look to bracts & upper leaves. (Illinois)

Read more about Hoary mountain mint flower. Note hairs & whitish look to bracts & upper leaves. (Illinois)

Broad, thrice divided fronds of bracken in Ontario Canada

Read more about Broad, thrice divided fronds of bracken in Ontario Canada