Notes For Reference:-

Species, Varieties, or Forms in the Genus Plantago:

Plantago asiatica / Oobako
Plantago camtschatica / Ezooobako
Plantago lanceolata / Heraoobako
Plantago major. var. japonica / Touoobako
　

Plantago major. var. japonica / Touoobako トウオオバコ

Plantago major var. japonica is a perennial herb that grows in coastal areas. This species is significantly larger than the other variety, Plantago asiatica. The leaves are all basal, somewhat thick, and leathery, measuring between 8 and 25 cm in length and 5 and 18 cm in width, with an oval shape and rounded tips rather than pointed ones. The plant produces racemose inflorescences that are 40 to 80 cm long, featuring dense clusters of small flowers that emerge among the leaves. The blooming period occurs from July to August.