Look for it also along roadsides. Its leaves vary from a bright green to a light green and from coarsely toothed to very deeply incised, both with fine, needle tips. An abundance of bright yellow flowers cover the leafy, rounded clumps of leaves. Some alpine trails traverse extensive patches of hundreds of Senecio fremontii plants. Since they are usually above tree line and often on bare rock, they are more than conspicuous and equally beautiful.
Extensive patches are quite common.
This and Senecio serra can be confused for they enjoy the same habitat, are equally tall, and are topped with many small, yellow sunflowers. The base of each Senecio triangularis leaf is broad, creating a triangular leaf shape versus the symmetrically tapering leaf of S. serra . Also, S. triangularis often has more leaves and grows in more dense patches.