Andropogon bicornis L.

bicornis grass, West Indian foxtail, Barbas de indio


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

 Distribution of Andropogon bicornis in Hawaiʻi.
 Distribution of Andropogon bicornis in Hawaiʻi.

Inflorescence

Andropogon bicornis Inflorescence
Andropogon bicornis Inflorescence
Andropogon bicornis Inflorescence
Andropogon bicornis Inflorescence
Andropogon bicornis Inflorescence
Andropogon bicornis Inflorescence

Plant

Andropogon bicornis Plant
Andropogon bicornis Plant
Andropogon bicornis Plant
Andropogon bicornis Plant
Andropogon bicornis Plant
Andropogon bicornis Plant
Andropogon bicornis Plant
Andropogon bicornis Plant

Habit

Andropogon bicornis Habit
Andropogon bicornis Habit

Spikelets

Andropogon bicornis Spikelets
Andropogon bicornis Spikelets
Andropogon bicornis Spikelets
Andropogon bicornis Spikelets
Andropogon bicornis Spikelets
Andropogon bicornis Spikelets
Andropogon bicornis Spikelets
Andropogon bicornis Spikelets
Andropogon bicornis Spikelets
Andropogon bicornis Spikelets
Andropogon bicornis Spikelets
Andropogon bicornis Spikelets
Andropogon bicornis Spikelets
Andropogon bicornis Spikelets
Andropogon bicornis Spikelets
Andropogon bicornis Spikelets

Landscape

Andropogon bicornis Landscape
Andropogon bicornis Landscape
Andropogon bicornis Landscape
Andropogon bicornis Landscape
Andropogon bicornis Landscape

Collar

Andropogon bicornis Collar
Andropogon bicornis Collar

Culm base

Andropogon bicornis Culm base
Andropogon bicornis 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 )