Alvera tree

From Memory Alpha, the free Star Trek reference.

The alvera tree is a woody plant native to Kreetassa. It is considered by the Kreetassans to be a cultural treasure.

In 2152, when a team from the Starfleet ship Enterprise visited Kreetassa to negotiate for a new plasma injector, Captain Archer's pet beagle, Porthos, urinated on one of the 300-year-old alvera trees standing outside the Hall of Diplomacy. The Kreetassans were insulted, and demanded Archer and his crew return to their ship.

Archer was ultimately required to perform a Kreetassan reconciliation ritual in order to apologize for defacing the tree. Ironically, the ritual itself involved the cutting of Alvera trees into pieces with a chainsaw. (ENT: "A Night in Sickbay").