October's official flower is Calendula, pronounced kah-LEN-doo-lah and/or kah-LEND-yuu-lah. It is the botanical name for the English marigold species, relating to the word calender, Latin calendae or kalends. The name means "first day of the month, little calendar" blooming year-round, so I'm a bit late posting this.
Calendula has many modern uses, from treating sore throats to reducing inflammation of the skin. It's petals are edible, and eating them protects cells fom being damaged by "free radicals." The name Marigold has been given since about the 16th century, and now has an appealing vintage charm. Marigold has ties to Dia de los Muertos in Mexico.
In 2011 there were 7 baby girls named Marigold and none named Calendula. If you're thinking Calendula is too weird, know that it does come with the super cute nickname Callie.