Mimulus guttatus DC.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - More or less erect, branched, 3–6 dm, glabrous or glandular-puberulent above; lvs variable, mostly obovate to subrotund, sinuate-dentate, the principal veins arising near the base; lower lvs short-petioled, the upper sessile; fls bright yellow, 2.5–4.5 cm, the cor-throat constricted by the well developed, bearded palate; cal accrescent in fr, the lobes all broadly triangular, the upper median one the largest, the lateral ones tending to fold inward in fr; 2n=16, 28, 30, 32, 48, 56. Wet places; native mainly in the w. cordillera, occasionally escaped from cult. in our range. July, Aug. (M. langsdorfii). The cordilleran population is more variable than the cult. forms here described, often with smaller fls.
common yellow monkey-flower