Possible Clues:

• The big flower of the south of the States?
• Mad dog in rear flower border
• Ordering a trip to border river
• River forming the boundary between the United States and Mexico
• Ordering a new flower
• River trip in which old family member takes part
• Ordering a structure divides the Americans and Mexicans
• Waterway that translates to "big river"
• American banker in Olympic city facing dreadful danger
• Ordering a wild flower