🦴⛓️🦴⛓️🦴

#rachis #spine #vertebral column #backbone #vertebrae #spinal axis

🌸——🌸

#rachis #inflorescence #flower stalk #peduncle #spikelet axis #floral axis

🪶↔️

#rachis #feather shaft #bird feather #ornithology #calamus #central shaft

🌿🪱🌿

#rachis #compound leaf #leaflet axis #pinna #plant structure #central stem

🌿⊥🌿

#rachis #fern frond #compound leaf structure #central axis #plant axis