Possible Clues:

• Shrub found in Michigan, Missouri and South America?
• Bubbly brunch beverage
• Flowering tree found in Maoism
• Flower; Buck's fizz
• Old woman has grabbed one’s abnormally large shrub
• Boozy brunch order
• One may be "bottomless" at brunch
• Maoism (anag)
• Bottomless brunch drink, often
• Plant doctors on board train going north