Is the princess pine a protected species in Connecticut?

It is not an officially protected species but you cannot harvest it on public land. You need the permission of the owner of private land.

Princess pine was once much prized for holiday wreath making and roping. Harvesting for this purpose combined with habitat loss (it needs shaded, undisturbed soil) had resulted in its scarcity. Protected or not, as an endangered species it is best left undisturbed and enjoyed in its native locations!