IUCN threat status:

Not evaluated

Comprehensive Description

Read full entry

Comments

Blue Toadflax has reasonably attractive foliage and flowers. Its appearance is very similar to Nuttallanthus texensis (Southern Blue Toadflax), but the latter has larger flowers (up to 1" long) and bumpy seeds. Blue Toadflax is also related to the introduced Linaria vulgaris (Yellow Toadflax), but the latter has larger yellow flowers (up to 1" long or more). There are other Toadflaxes from Eurasia that occur primarily in sterile waste areas, but they usually have smaller flowers (¼" or less). Blue Toadflax superficially resembles Lobelia kalmii (Kalm's Lobelia), but the flowers of the latter lack nectar spurs and it usually blooms later in the year. Another scientific name for Blue Toadflax is Linaria canadensis.

Trusted

Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© John Hilty

Source: Illinois Wildflowers

Disclaimer

EOL content is automatically assembled from many different content providers. As a result, from time to time you may find pages on EOL that are confusing.

To request an improvement, please leave a comment on the page. Thank you!