Bromus inermis Leyss.
Smooth brome
Smooth brome is native to Europe, and is both native and introduced in North America. Though widely cultivated, it is an invasive species in many North American habitats.
Plants: These perennial cool season grasses are 1½–3′ (45–91 cm) tall. They spread via rhizomes and produce sod.
Leaves: Usually hairless, sometimes with hairs on the sheaths. Blades are 4–14 ⨉ ⅛–½″ (10–35 cm ⨉ 5–15 mm), and basal leaves are numerous. Leaves are flat, apart from a raised midrib on the underside, and often, a W-shaped cross-section near the leaf tips.
Flowers: Panicles are 4–8″ (10–20 cm) long. They have two or more spikelets per panicle, each somewhat flattened, with 6 to 13 fertile florets. Flowers are purplish-brown when mature. Flowers appear from May to July.
Fruits: Flowers become smooth, awnless seeds about ¼″ (8.5 mm) long.
Habitats: Sunny or partially shaded disturbed soils, woodlands and woodland edges, roadsides, fence rows, fields and waste areas.
Online References:
6/11/2014 · Conservation Area near Potanipo Pond, Brookline, New Hampshire · ≈ 8 × 9″ (19 × 24 cm) 
6/20/2016 · Wildlife Pond Trail, Beaver Brook Conservation Area, Hollis, New Hampshire 
6/20/2016 · Wildlife Pond Trail, Beaver Brook Conservation Area, Hollis, New Hampshire 
6/22/2010 · Nashua River Rail Trail, Ayer, Massachusetts · ≈ 8 × 12″ (20 × 31 cm) 
6/27/2016 · Nashua River Rail Trail, near Nashoba Hospital, Ayer, Massachusetts 
8/17/2019 · Wildflower Trail, Beaver Brook Conservation Area, Hollis, New Hampshire · ≈ 6 × 8″ (16 × 20 cm) 
7/26/2025 · River Point Conservation Area, Falmouth, Maine · ≈ 8 × 5″ (20 × 13 cm) 
6/27/2016 · Nashua River Rail Trail, near Nashoba Hospital, Ayer, Massachusetts 
7/26/2025 · River Point Conservation Area, Falmouth, Maine · ≈ 8 × 5″ (20 × 13 cm) 
6/20/2016 · Wildlife Pond Trail, Beaver Brook Conservation Area, Hollis, New Hampshire 
6/7/2017 · Burns Loop Trail, Beaver Brook Conservation Area, Burns/Holland Farm, Milford, New Hampshire · ≈ 4 × 6″ (10 × 15 cm) 
6/20/2016 · Wildlife Pond Trail, Beaver Brook Conservation Area, Hollis, New Hampshire 
7/26/2025 · River Point Conservation Area, Falmouth, Maine · ≈ 8 × 5″ (20 × 13 cm) 
6/20/2012 · Nashua River Rail Trail, Groton Center, Groton, Massachusetts · ≈ 4 × 3″ (10 × 7.9 cm) 
6/20/2016 · Wildlife Pond Trail, Beaver Brook Conservation Area, Hollis, New Hampshire 
6/7/2017 · Burns Loop Trail, Beaver Brook Conservation Area, Burns/Holland Farm, Milford, New Hampshire · ≈ 3½ × 6″ (9.4 × 14 cm) 
7/2/2017 · Wildlife Pond, Beaver Brook Conservation Area, Hollis, New Hampshire · ≈ 7 × 4½″ (17 × 11 cm) 
6/13/2017 · Old Long Loop, Beaver Brook Conservation Area, Hollis, New Hampshire · ≈ 6 × 9″ (16 × 21 cm) 
6/19/2021 · Long Reach Preserve, Harpswell, Maine · ≈ 4 × 6″ (10 × 15 cm) 
6/22/2010 · Nashua River Rail Trail, Ayer, Massachusetts · ≈ 9 × 6″ (23 × 15 cm) 
6/20/2012 · Nashua River Rail Trail, Groton Center, Groton, Massachusetts · ≈ 6 × 4″ (15 × 10 cm) 
6/27/2016 · Nashua River Rail Trail, near Nashoba Hospital, Ayer, Massachusetts 
6/16/2010 · Nashua River Rail Trail, Groton Center, Groton, Massachusetts · ≈ 4 × 6″ (10 × 15 cm) 
6/22/2010 · Nashua River Rail Trail, Ayer, Massachusetts · ≈ 6 × 4″ (15 × 10 cm) 
| Kingdom | Plantae | Plants, but not fungi, lichens, or algae (from Stearn's Botanical Latin) |
| Subkingdom | Tracheobionta | Vascular plants—plants with a “circulatory system” for delivering water and nutrients |
| Division | Magnoliophyta | Flowering plants, also known as angiosperms |
| Class | Liliopsida | Monocots (plants with a single seed leaf); includes the lily family |
| Subclass | Commelinidae | Dayflowers and spiderworts, and several others |
| Order | Cyperales | Flowering plants including grasses |
| Family | Poaceae | Grasses (but not sedges or rushes) |
| Genus | Bromus | From the Greek bromos, an ancient name for the oat |
| Species | inermis | Unarmed, without prickles |
Bromus inermis description by Thomas H. Kent, not updated.
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