Flora of the Hawaiian Islands
Dicotyledon Literature for Ageratum conyzoides
Wagner et al., 1990, 1999; Lorence & Wagner, 2020.
   Asteraceae -- The Sunflower Family Bibliography
      Ageratum conyzoides

Common name(s): maile hohono, maile honohono, maile kula
General Information
DistributionNative to Central and South America.In the Hawaiian Islands, naturalized on Ni`ihau, Kaua`i, O`ahu, Moloka`i, Lana`i, Maui, Kaho`olawe, Hawai`i.

Malodorous annual or short-lived perennial herb, 3‒15 dm tall; stems sparingly branched, sparsely to densely pilose.
Leaves petiolate; blade ovate to broadly ovate, 3‒10 cm long, 3‒7 cm wide, abaxial surface conspicuously dotted with glands, margin crenate, base cuneate to truncate, apex acute, tip rounded; petiole 1‒5 cm long.
Heads usually in flat topped cymes; involucral bracts 3‒4 mm long, glabrous to sparsely hirsute; corollas bluish lavender, rarely whitish; pappus of 5 well-developed awn tipped scales, rarely reduced or not awn tipped.
Achenes scaberulous on the angles.
2n = 20, 40.
Nancy Khan