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Info
Subfamily: Panicoideae
Genus etymology: Andropogon = "man's beard" [Greek] refering to the long hairs (bearded) pedicels
Species etymology: bicornis = "two horns" [Latin] refering to the two branched inflorescence, although this is shared in most members of the genus
Photosynthetic type: C4 (warm season)
Nativity: naturalized - accidental
First recorded in Hawaiʻi: 1987
Legal status: HDOA - noxious weed
Map
Inflorescence
Plant
Habit
Spikelets
Landscape
Collar
Culm base
Description
Plants densely cespitose, upper portion dense, obovate to obpyramidal. Culms 60-250 cm; internodes not glaucous. Sheaths smooth; ligules 0.6-1 mm; blades 20-70 cm long, 2-7 mm wide, usually glabrous or scabrous on the margins. Inflorescence units 50-500; subtending sheaths 2.5-4.5 cm long, 2-3 mm wide; peduncles 20-70 mm, with 2(3) rames; rames 2-4 cm, exerted at maturity; internodes filiform, densely and evenly pubescent, hairs 3-9 mm. Sessile spikelets 3-4 mm; unawned; callus hairs 0.5-1 mm; keels of lower glumes scabrous above the midpoint; anthers 3, 1-1.4 mm. Pedicellate spikelets mostly vestigial or absent, 1-2 of those in the terminal units on each rame 3-5 mm and staminate. 2n = 60, 120.
(Description source: Barkworth, M.E., Capels, K.M., Long, S. & Piep, M.B. (eds.) 2003. Flora of North America, north of Mexico. Volume 25. Magnoliophyta: Commelinidae (in part): Poaceae, Part 2. Oxford University Press, New York. 783 pp http://floranorthamerica.org/Andropogon_bicornis )