Pollen Type: Grass
Cross-Reactivity: Northern Grasses
HS Allergy Extract: Brome, Smooth
Genus/Species: Bromus inermis
Common Names: Brome
Distribution: Found especially from Minnesota and northern Kansas westward to Washington and Oregon.
Locations: Smooth Brome is cultivated for hay, pasture, and revegetation after fire. It’s also found in moist, wooded areas and in roadside ditches.
Pollination Method: Wind-pollinated, self-compatible.
Pollinating Period: Spring into Summer
Description: Smooth Brome is an upright perennial grass growing 1’-4’ tall from creeping rootstalks (rhizomes). The smooth blades are 1/4″-1/2” wide, with a soft “m” shaped indentation. The panicle, or flower cluster growing on the end of the branch, is 4”-9” long and has curled branches. The panicle spreads when in flower and is thin at maturity. The flower spikelets are roundish, 3/4″-1” long, and are awnless or have very short awns, which are hair or needle like appendages. Smooth Brome is drought intolerant and produces abundant growth. It blooms during hot afternoons in June and early July.