deer's-tongue

from The Century Dictionary.

• noun A composite plant, Trilisa odoratissima, of the United States, with rather fleshy leaves which are pleasantly fragrant when dry.
• noun The white adder's-tongue, Erythronium albidum.
• noun The rib-grass, Plantago lanceolata. In all the deer's-tongues the form of the leaf suggests the name.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Bot.) A plant (Liatris odoratissima) whose fleshy leaves give out a fragrance compared to vanilla.