Literature for Bidens menziesii Wagner et al., 1990, 1999. Literature for Bidens menziesii subsp. menziesii Wagner et al., 1990, 1999. Literature for Bidens menziesii subsp. filiformis Wagner et al., 1990, 1999.
Asteraceae -- The Sunflower Family	Bibliography
Bidens menziesii

General Information
Distribution
Habit	Erect, sparingly branched shrubs 0.8-4 m tall.
Leaves	Leaves bipinnately divided into long linear divisions, usually 4-26 cm long including petiole, ultimate divisions linear or filiform, 0.2-11 cm long, 0.1-0.45 cm wide, glabrous or pubescent, margins usually entire.
Flowers	Heads more than 40 in dense, many-branched, compound cymes terminating main stem and lateral branches, (1.5-)2-3.5 cm in diameter including ray florets, peduncles 0.3-2 cm long, glabrous or pubescent; outer involucral bracts 1-2.5 mm long (sometimes longer on plants from Moloka`i), the inner ones distinct; ray florets 4-5 per head, sterile, rays yellow, 12-24 mm long, 5-6 mm wide; disk florets (5)6-8(-16) per head, perfect or female(and then plants gynodioecious), corollas yellow; pappus of 2 awns less than 1 mm long or absent.
Fruit	Achenes grayish black, straight, wingless or very rarely winged, 9-12 mm long, 1-1.5 mm wide, glabrous.
Chromosomes	[2n = 72*; subsp. menziesii and subsp. filiformis.]