Archtree

Archtrees are a kind of lifeform native to planet Koehler in the Orion's Arm universe.

Biology
Archtrees share characteristics with both animals and plants. Externally, each specimen looks like a leafless purple trunk with branches at both ends. The trunk may either be straight or bent, with both ends of branches touching the ground in the last case.

Archtrees are capable of locomation by arching their bodies, but they are glacially slow, needing Earth months or years to transition between the bent and straight postures.