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Intermountain Herbarium
Intermountain Herbarium (Utah State University)
Yavapai County Native & Naturalized Plants

Hordeum marinum - seaside barley

Plant Form:Grass

Family: Poaceae

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  Grass Description -   Glossary of Grass Terminology

Origin: Introduced    Season: Warm
Habitat Description: Found in moist disturbed areas in alkaline soils.
Plant Communities: Riparian, Disturbed Areas
Elevation: 500 - 6500 feet

Similar Species: Hordeum murinum

General Description

Desc: Loosely tufted annual with straight or slightly bent stems up to 20 inches tall, spreading at the base. Basal sheaths are somewhat hairy.
Identification notes: Hordeum marinum lacks auricles, which distinguishes it from H. murinum. Glumes straight, ascending to slightly divergent at maturity. Lemmas of the lateral spikelets with awns up to 1/4 inch long.
Grass Type: Annual  Rhizomes: N  Stolons: N
Large Dense Clump (> 2 feet): N  Bushy (highly branched): N
Height with Seedheads: 12 to 24 inches
Seedhead Structure: Unbranched  Seedhead Droops: N
Flowering Period: Apr - Jun

Flower Characteristics

Number of Flowers per Spikelet: One-flowered  Spikelets One-sided: N
Awns: 1/4 inch to 1 inch   Three Awns: Y  Awns Bent: N

Flower and Seedhead Notes: Spikelets are dense up to 3 inches long; green or purplish on the awns and glumes. Three spikelets per node; lateral spikelets sub-sessile, sterile; central spikelets sessile and fertile. Lemma awns up to 1/4 inch long.

Vegetative Characteristics

Blade Hairy: Y  Blade with White Margin: N  Blade Cross Section: Flat or involute  
Blade Notes: Blades are thin and about 3 inches long, less than 1/4 inch wide; sparsely to densely hairy on both sides.
Sheath Hairy: Y  Tuft of Hairs Top of Sheath or Collar: N  Ligules: Membranous
Auricles (Ear-like lobes at base of blades): N
Vegetative Notes: Ligule is very short with a square base and toothed edge.

Forage Value: Grass is used by wildlife and stock for early season forage but contains little nutritive value, especially after setting seedheads.

  Arizona Cooperative Extension
Yavapai County
840 Rodeo Dr #C
Prescott, AZ 86305
(928) 445-6590
Version 8.0  
Last Updated: Feb 16, 2020  
Content Questions/Comments: Email Jeff Schalau  
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