Achillea

System Logic

• Co-dominant metabolite specialization in aerial reproductive and vegetative tissues
• Chemical identity distributed across exposed organs rather than centralized in roots or storage structures

Leaves & Flowers

• High diversity of specialized metabolites
• Flavonoids, phenolic acids, essential oils, sesquiterpene lactones
• Core domain defining anti-inflammatory, antimicrobial, and digestive functions

Roots

• Low to moderate metabolite specialization
• Supportive phenolics and baseline compounds
• Persistence and anchoring

Stems

• Minimal metabolite specialization
• Structural and transport functions

Very short check:

• Shift from root-centered → aerial-distributed specialization
• More refined than Rubus (broader chemistry, not just phenolics)
• Less singular than Digitalis, but rich multi-compound system