Plant Image
- Patrick Alexander @, Usage Rights: Creative Commons Attribution-ShareAlike (CC BY-SA)

Yavapai County Native & Naturalized Plants

Avena sativa - common oat

Plant Form: Grass

Family: Poaceae

line decor
  Home   Plant Communities Plant List Search Forbs and Subshrubs Search Grasses Search Woody Plants Additional Resources About this Website
line decor

Click on Any Image for a Larger View

Patrick Alexander @, Usage Rights: Creative Commons Attribution-ShareAlike (CC BY-SA)
Patrick Alexander @, Usage Rights: Creative Commons Attribution-ShareAlike (CC BY-SA)
Max Licher @, Usage Rights: Creative Commons Attribution-ShareAlike (CC BY-SA)
  Grass Description -   Glossary of Grass Terminology

Origin: Introduced    Season: Cool and Warm
Habitat Description: Dry wasteland, especially on heavier soils. Roadsides, fields, railroads, and other disturbed places.
Plant Communities:Disturbed Areas
Elevation: 1000 - 7500 feet

Similar Species: A. fatua
General Description

Desc: Oats have a fibrous root system. Stems are erect, smooth, and hollow. The leaves are narrow. The primary seedhead branches are drooping. The spikelets (clustered units of flowers and bracts) are solitary and pendulous.
Identification Notes: Spikelets are mostly 2-flowered, lemma awns are straight and not twisted, often reduced; lemmas are glabrous while the lemmas of A. fatua are long-hairy on their back; florets do not easily fall from the glumes.
Grass Type: Annual  Rhizomes: N  Stolons: N
Large Dense Clump (> 2 feet): N  Bushy (highly branched): N
Height with Seedheads: Greater than 36 inches
Seedhead Structure: Branched - open and spreading  Seedhead Droops: Y
Flowering Period: Jun - Jul
Flower Characteristics

Number of Flowers per Spikelet: Multi-flowered  Spikelets One-sided: N
Awns: Less than 1/4 inch   Three Awns: N  Awns Bent: N
Flower and Seedhead Notes: The seedhead is open, pyramidal, loosely spreading, nodding, 7 to 15 inches long and 2 to 6 inches wide. Spikelets have 2 or 3 wedge-shaped fertile florets, overlapping glumes; attach to main seedhead by thin stems and stay on the seedhead at maturity.
Vegetative Charcteristics

Blade Hairy: N    Blade with White Margins: N    Blade Cross section: Flat
Blade Notes: Leaves are cauline (arise from the upper part of the stem). Leaf-blades are 5 to 15 inches long and less than 1/2 inch wide. The leaf-blade surface is minutely rough-textured on both sides. The tip of the leaf-blade tapers to a point.
Sheath Hairy: N    Tuft of Hairs at top of Sheath or Collar: N    Ligules: Membranous
Auricles (Ear-like lobes at collar area: N

Forage Value: Oats are high in protein, carbohydrates and fiber. Both the grain and fodder are utilized by grazing animals. The forage yield and forage feeding value of the harvested crop change as the oat plant matures through its growth stages.

  Arizona Cooperative Extension
Yavapai County
840 Rodeo Dr #C
Prescott, AZ 86305
(928) 445-6590
Version 8.0  
Last Updated: Dec 13, 2022
Content Questions/Comments: Email Matt Halldorson  
Legal Disclaimer