Senecio triangularis (Arrowleaf Senecio)
Family: Asteraceae (Sunflower)
     
Arrowleaf Senecio is a common plant growing along mountain streams or wet meadows. Plants grow up to four feet tall and can form dense patches. Yellow flowers bloom at the top of the stem. Leaves are triangular with toothed margins.

Vegetation zone: Montane, Subalpine
Time of bloom:  July - September
Origin:  Native