Ageratina lavenia,
occurring in wetlands or at the water's edges, is a perennial herb
with a height of 0.3-1m. Leaves with long petioles have opposite
phyllotaxis; blades are 4-20cm long, 3-12cm wide, in an ovate to
long oblong shape, with obtuse serrations on margins. The stem's
upper parts branch well and set 5-8mm-in-diameter flower heads on
the tips. Involucres are hemispherical, and involucral bracts bend
back after flower. Bloom time: September-November. |