aristate

As a noun aristae

is plural of arista.

As an adjective aristate is

having a long bristle at its apex.

As adjectives the difference between cristate and aristate

is that cristate is having a crest; crested while aristate is (botany|of leaves) having a long bristle at its apex.

As adjectives the difference between aristate and tristate

is that aristate is (botany|of leaves) having a long bristle at its apex while tristate is having, or pertaining to, three distinct states.

As a noun tristate is

the area in some regions of the united states where three state borders come to a single point.