[A. sandwicense H. Lev.]
(nat) Maile hohono, maile honohono, maile kula
Malodorous annual or short-lived peren¬nial herbs 3-15 dm tall; stems sparingly branched, sparsely to densely pilose. Leaves ovate to broadly ovate, 3-10 cm long, 3-7 cm wide, lower surface conspicuously dotted with glands, margins crenate, base cuneate to truncate, petioles 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.] Native to Central and South America; in Hawaii a widespread and often common weed, from sea level to at least 1,300 m, on all of the main islands. Naturalized prior to 1871 (Hillebrand, 1888).— Plate 14.
This plant has been variously treated. M. F. Johnson (1971) excluded Ageratum sandwicense from the genus because of its capillary pappus; Lauener (1976) listed it under Adenostemma lavenia. The type specimen (Faurie 940, P) was examined by us and found to represent. conyzoides.