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Webster 1913 Edition

Noun.

[Said to be poisonous to dogs. Cf.

(Bot.)

A small genus of perennial herbaceous plants, with poisonous milky juice, bearing slender pods pods in pairs.

dogbane ‎(plural dogbanes)

(botany) Any species of genus Apocynum, eponymous of the dogbane family Apocynaceae
Most dogbanes are poisonous tropical plants producing showy flowers and milky juice

Apocynum