Plant Ontology (PO)
Vocabulary describing plant anatomy, morphology, and developmental stages across green plants.
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Where this one tends to earn its keep.
Crop genomics phenotype annotation
Plant breeding data standardization
Agricultural research data integration
Botanical specimen classification
I haven't checked this label against the actual licence text — it's the catalogue's original guess. Check the ontology's own site before you rely on it.
Others worth a look in Life Sciences.