This is currently the longest scientific plant name, at 38 letters.

Runner up is at 37 letters, Austrocephalocereus dolichospermaticus.

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Has the longest binomial name of any plant, with 38 letters. Species epithet means "inclined towards the north". It is a miniature bulb, only growing to be 3-4 centimeters tall.
The second longest plant scientific name is Austrocephalocereus dolichospermaticus, with 37 letters.
The longest animal scientific name is Parastratiosphecomyia stratiosphecomiyioides, with 41 letters

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