| tarweed | (noun) any of various resinous glandular plants of the genus Madia; of western North and South America | - |
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| (noun) any of various western American plants of the genus Grindelia having resinous leaves and stems formerly used medicinally; often poisonous to livestock | Synonyms: gum plant, gumweed, rosinweed |
| tarwood | (noun) New Zealand shrub | Synonyms: Dacrydium bidwilli, Halocarpus bidwilli, New Zealand mountain pine, tar-wood |
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| (noun) New Zealand silver pine of conical habit with long slender flexuous branches; adapted to cold wet summers and high altitudes | Synonyms: Dacrydium colensoi, tar-wood |