I thought I answered this, maybe on facebook - the flower is all wrong for a mint. There are a few other plants with square stems.

Dorothy, watch your back! And I'm so sorry about the air travel complications and non-refundable tickets. Such a blow. You can get hastened passports, but you need to drive to the large nearby city that handles it and it still takes a day or so and an extra fee (less than losing all of the ticket cost). A friend had to do that earlier this year for travel to Mexico.