cereal rye

(Secale cereale)

               
Conservation Status

IUCN Red List

not listed

cereal rye

 

NatureServe

NNA - Not applicable

SNA - Not applicable

Minnesota

not listed

Nativity

Native to Europe, Asia, and the Indian subcontinent. Widely cultivated. Often escapes but rarely persists.

Occurrence

Common in restorations.

Habitat

Roadsides, old fields, and other disturbed areas

Flowering

July to August

Height

20 to 48

 
Identification

Cereal rye is an annual, tuft-forming grass native to Europe, Asia, and the Indian subcontinent. It is widely cultivated as a food crop and is often seeded in road banks following construction as a cover crop to prevent soil erosion. Often escapes cultivation but it rarely persists. It is on the Noxious Weed List in 46 states, but it is not listed in Minnesota.

The stem (culm) is slender, erect, hollow between the nodes, branched from the base, leafy, and 20 to 48 in height, over-topping the leaves. The culm surface is bluish-green and covered with a whitish, waxy film (glaucous). It is usually hairless, sometimes hairy below the spike.

The lower part of the leaf that surrounds the stem (sheath) is usually shorter than the distance between the nodes. It is open, not fused together most of the way to the top. The sheath on the lowermost leaf may be hairy, but those of the other leaves are hairless.

The appendage at the inner (upper) surface at the tip of the leaf sheath (ligule) is 1 32 (1 mm) long. It is thin, pliable, more or less transparent (membranous), and straight across (truncate) at the top but often irregularly cut and appearing torn (lacerate).

The leaf blade is flat, grass-like (linear), parallel-veined, usually hairless, up to 11¾ long, and to ½ wide. There are often small projections (auricles) at the base.

The inflorescence is a single dense spike at the end of the stem. The spike is slender, linear-oblong in outline, somewhat flattened, and 2 to 6 long not counting the bristle-like tips (awns). It is somewhat nodding at maturity. The spike is composed of numerous, crowded, alternate, spikelets, a solitary spikelet at each node of the inflorescence. They are positioned with a flat side against the axis (rachis).

The spikelets are all similar in appearance and size. At the base of each spikelet there are two sterile bracts (glumes), the first one the lower, the second one the upper. There are usually two florets on a short axis (rachilla). When there is a third, the third is undeveloped (rudimentary) and above the others. The florets consist of an outer bract (lemma), an inner bract (palea), and 2 fleshy scales (lodicules) at the base of the stamens or pistil. The male floret has 3 yellow, ¼ to 5 16 long stamens. The female floret has 1 pistil with 2 styles. The upper and lower glumes are similar in size in shape, narrowly linear, sharply pointed, ¼ to ½ (6 to 13 mm) long, and 1 64 to 1 32 (0.5 to 1.0 mm) wide. They have 1 nerve and a raised ridge (keel). They are hairless but the keel is rough. The lemma is thickened, somewhat hard, 7 16 to (11 to 16 mm) long, and elliptic egg-shaped. It has 5 nerves and a keel that is off-center. The keel continues as a bristle-like extension (awn) that is up to 2¾ long. The lemma is hairless except for a line of stiff hairs on the keel and on the margins. The palea is shorter than the lemma. At maturity, the spikelet breaks off (disarticulates) above the glume and between the florets.

The fruit is an oblong, ¼ to long, specialized capsule (caryopsis) in which the ovary wall is fused to the seed coat. It is yellowish-brown to orangish-brown, deeply grooved, and hairy at the tip.

 
Similar
Species

Ergot

 
Pests and Diseases

 

 
Distribution Distribution Map  

Sources: 2, 3, 4, 5, 7, 22, 29, 30.

 
Comments

 

 
Taxonomy

Family:

Poaceae (grasses)

 

Subfamily:

Pooideae

 

No Rank:

Triticodae

 

Tribe:

Triticeae

 

Subtribe:

Hordeinae

 
Synonyms

Secale turkestanicum

Triticum cereale

 
Common
Names

cereal rye

common rye

cultivated annual rye

cultivated rye

rye

   

 

 

 

 

 

 

Glossary

Auricle

A small, ear-like projection at the base of a leaf or at the junction of a grass blade and stem.

 

Awn

A stiff, bristle-like appendage at the tip of the glume, lemma, or palea of grass florets.

 

Bract

Modified leaf at the base of a flower stalk or flower cluster.

 

Culm

The hollow or pithy stem of a grass, sedge, or rush.

 

Glaucous

Pale green or bluish gray due to a whitish, powdery or waxy film, as on a plum or a grape.

 

Glume

A chaffy, empty, sterile bract at the base of a grass spikelet. Glumes usually occur in pairs, but occasionally only one is present.

 

Ligule

In grasses, a membranous appendage at the junction of the leaf and the leaf sheath, sometimes no more than a fringe of hairs. In flowering plants, the flat, strap-shaped, petal-like portion of the corolla of a ray floret.

 

Membranous

Thin, pliable, and more or less transparent.

 

Node

The small swelling of the stem from which one or more leaves, branches, or buds originate.

 

Rachis

The main axis of a compound leaf, appearing as an extension of the leaf stalk; the main axis of an inflorescence.

 

Sheath

The lower part of the leaf that surrounds the stem.

 

Spikelet

In flowering plants, a small spike. In grasses and sedges, the basic unit of inflorescence. In grasses, composed of usually two glumes and one or more florets. In sedges, a single flower and its single associated scale.

       
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About

Cereal rye is an introduced annual bunchgrass often standing about 1-1.5 m tall. Sometimes cultivated in Montana but generally found along roadsides and similarly disturbed settings. The inflorescence has 1 spikelet per node, usually 2 well developed florets per spikelet, very narrow glumes that are much shorter than the lemmas, and lemmas margins and midribs distinctively lined with long-scabrous or stout-ciliate hairs.

 
     

 

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Created: 7/4/2019

Last Updated:

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