How many states have a type of pine tree as their state tree?

12 (wrong)

Only 10 states have pines as their state tree:

Alabama (AL) Longleaf pine

Arkansas (AR) Pine

Idaho (ID) Western white pine

Maine (ME) Northern white pine

Michigan (MI) Northern white pine

Minnesota (MN) Red pine

Montana (MT) Ponderosa pine

Nevada (NV) Singleleaf pinyon pine OR bistlecone pine (they are different)

New Mexico (NM) Pinyon pine

North Carolina (NC) Longleaf pine

There are also several states with other conifers similar to pines as state trees:

Alaska (AK) Sikta spruce

California (CA) Coast redwood OR giant sequoia

Colorado (CO) Blue spruce

Louisiana (LA) Bald cypress

Oregon (OR) Douglas fir

Pennsylvania (PA) Eastern hemlock

South Dakota (SD) Black hills spruce

Utah (UT) Blue spruce

Washington (WA) Western hemlock

None of these are PINES

Spruces are genus Piceauga

Coast redwoods are genus Sequoia

Giant sequoias are genus Sequoiadendron

Cypress are genus Taxodium

Douglas firs are genus Pseudotsuga

Hemlock is genus Tsuga

Pines are genus Pinus.