Classic texts: King's 1898.
Verbena hastata
Verbena hastata L.
Engl.: blue vervain, swamp verbena, American vervain, false vervain, Indian hyssop, vervain, wild hyssop.
Deu.: Lanzen-Verbene, Spiess-Eisenkraut.
Suom.: tähkäverbena.
Sven.: blåverbena.
470. Verbena hastata.—American Blue Vervain. 471. Verbena urticaefolia.—White vervain.
Classic texts: Sayre 1917.
The Medical Flora of Kansas: Taraxacum - Zanthoxylum.
Classic texts: Journals: TNEMA 1882-1883.
On Some Useful Plants of the Natural Order of Verbenacae.
Classic texts: Journals: AJP 1885.
Lemon verbena and percolating.
Henriette's herbal blog: Percolating a lemon verbena tincture.