Yellow Toadflax in Detail.

Linaria vulgaris, commonly known as butter-and-eggs or yellow toadflax, is a herbaceous perennial plant that belongs to the family Plantaginaceae. It is native to Europe and western Asia but has been introduced to other parts of the world, including North America, where it is considered an invasive species.

Linaria vulgaris typically grows to a height of 12-31 in (30-80 cm) and spreads by rhizomes. Its leaves are linear or lance-shaped, 0.8-2.4 in (2-6 cm) long and 0.08-0.31 in (2-8 mm) wide. The flowers are bright yellow, 0.8-1.2 in (2-3 cm) long and are borne in dense spikes at the top of the stem from June to September.

In terms of its habitat, Linaria vulgaris can be found in a variety of environments, including meadows, grasslands, roadsides, and disturbed areas. It prefers well-drained soils and can tolerate a range of soil types.

Linaria vulgaris has been used for medicinal purposes in the past, but its efficacy and safety have not been thoroughly studied. Additionally, while it is a pretty plant, its invasive nature means that it can have negative impacts on native plant communities and should be carefully managed to prevent its spread.