Northern Prairie Wildlife Research Center
Northeast Wetland Flora
Field Office Guide to Plant Species
Bromus japonicus Thunb.
- Family: Grass (Gramineae)
- Flowering: May-July
- Field Marks: This is the only annual Bromus that has a spreading or drooping
inflorescence and a slightly twisted awn 1/3-1/2 inch long.
- Habitat: Fields, disturbed areas.
- Habit: Annual herb with fibrous roots.
- Stems: Upright, unbranched, up to 2 1/2 feet tall, densely hairy.
- Leaves: Elongated, flat, 1/12-1/6 inch wide, soft-hairy on both surfaces; ligules membranous.
- Flowers: Borne in spikelets in a spreading or drooping inflorescence, 4-8 inches long;
spikelets 7- to 10-flowered, 1-1 1/4 inches long; glumes smooth, pointed at the tip; lemmas
rounded at the tip, but with a slightly twisted awn 1/3-1/2 inch long.
- Sepals: 0.
- Petals: 0.
- Stamens: 3.
- Pistils: Ovary superior, smooth.
- Fruits: Oblongoid, smooth.
- Notes: This family is called Poaceae by Gleason and Cronquist. This is an introduced,
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