Scale bar is 1cm
Prairie Grass - introduced (*Bromus catharticus)
Native to South America. Perennial. C3.
Family. Poaceae (Grass family).
- it is a tall grass (to 1.5m)
- the flower cluster is a loose spray
- the glumes are shorter than the spikelets
- the spikelets have many close-packed lemmas
- the lemmas are unawned or shortly awned
- the spikelets are sideways compressed
- the leaves are flat
- the ligule, becoming torn, is up to 4mm long
- the glumes taper to a very short (to 0.3mm) awn
- the spikelets are neatly packed close together, alternating sides along the spikelet
- the lemmas may have short awns (to 4mm), and are strongly keeled (i.e have a central ridge, like that of a boat)
- the flowers are green at first, and colour to distinctive shades of brown and green.
Prairie Grass is a very common weed, usually growing with other weeds in disturbed places. The flowers with shades of green and brown are distinctive.
It is an environmental weed.
Bromos: a kind of oat; catharticus: a purging effect.
1-4. Spikelets. Castlemaine.