Flowering plants on Gamma Trianguli VI that swivel towards movement and fire a spray of poisonous thorns, killing an Enterprise crewman and wounding Spock in The Apple.
The pod plants of Gamma Trianguli VI look like large, attractive blooms. When something moves nearby, the flower head turns to face it and shoots out a cluster of thorns tipped with a poison that can kill a human in seconds.
They appear in the Original Series episode The Apple in 2267. Soon after the landing party beams down to what looks like a paradise, security officer Hendorff bends to look at one of the plants and is killed. Later Spock notices another taking aim at Kirk, pushes him aside and takes the thorns in the chest himself.
Spock survives, thanks to his Vulcan constitution and McCoy's treatment. The plants are one of several lethal hazards on the planet, which is run for its childlike inhabitants by the machine Vaal.