Boyd’s Bible Dictionary:

(pointed leaf yielding perfume). An ancient fragrant and costly ointment made from the spikenard plant of India (Song of Sol. 1:12; 4:13-14; Mark 14:3; John 12:3).

Concise Bible Dictionary:

A plant that grows in India: so called, it is said, because of the spikes that grow out of its roots. Its root and leaves are imported. A costly ointment was made of it, giving off a sweet perfume (Song of Sol. 1:12; Song of Sol. 4:13-14; Mark 14:3; John 12:3). It has been identified with the Nardostachys jatamansi.
Nardostachys Jatamansi