Nuttallanthus canadensis (L.) D.A. Sutton
Linaria canadensis (L.) Chaz.
Blue Toadflax, Canada Toadflax
Blue toadflax is pretty easy to miss. The foliage is thin, thinner than grass blades, and the flowers are diminutive, atop thin stems. From a distance, a colony of blue toadflax resembles a low-lying cloud of blue mist. It is pretty cool when you take a closer look at it.
Identification: Up to 24" (60 cm) in height, though it is sometimes bent under its own weight. Flowers are blue, and ¼-½" (6.3-12 mm) long. They are “bilaterally symmetrical,” that is, if you cut them down the center, the halves are mirror images. There are two petals on top, and three larger ones on the bottom, with a white patch in the center. Stems may be green or reddish-green. Leaves are less than ⅛" (3.2 mm) wide and up to 1½" (3.8 cm) long.
Nuttallanthus canadensis on Missouriplants.com
Nuttallanthus canadensis on the Connecticut Botanical Society's Connecticut wildflowers site
Nuttallanthus canadensis at Illinois Wildflowers
Nuttallanthus canadensis at the Lady Bird Johnson Wildflower Center
Nuttallanthus canadensis on Southeastern Flora, the Southeastern U.S. Plant Identification Resource
Nuttallanthus canadensis on CalPhotos
Nuttallanthus canadensis on Keir Morse's site, Keirosity.com
Nuttallanthus canadensis on the Madrean Archipelago Biodiversity Assessment
Nuttallanthus canadensis on SEINet—the Southwest Environmental Information Network
Nuttallanthus canadensis description by Thomas H. Kent, last updated 17 Jun 2016.