Avena strigosa Schreb.

lopsided oat

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New England Distribution

Adapted from BONAP data

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North America Distribution

Adapted from BONAP data

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Facts About

The cultivation of lopsided oat in Europe, where it was formerly grown in marginal environments in place of oat (Avena sativa) has all but ended, although it is widely grown in Brazil as a cover and forage crop. In North America, this species has been collected in California and Massachusetts, but is not a common weed.

Habitat

Anthropogenic (man-made or disturbed habitats), meadows and fields

Characteristics

Habitat
terrestrial
New England state
Massachusetts
Leaf blade width
Up to 10 mm
Inflorescence branches
the flowers are attached to branches rather than to the main axis of the inflorescence
Spikelet length
14–26 mm
Glume relative length
both glumes are as long or longer than all of the florets
Awn on glume
the glume has no awn
One or more florets
there is more than one floret per spikelet
Lemma awn length
3–35 mm
Leaf ligule length
2–5 mm
Anther length
2.5–4 mm
Show All Characteristics
  • Flowers
    Anther length
    2.5–4 mm
    Anther number
    3
    Awn on glume
    the glume has no awn
    Floret lower bract texture
    • the lemma is hard and firm
    • the lemma is thin and flexible
    Floret number
    2
    Floret types within spikelet
    all the florets within a spikelet are similar
    Glume relative length
    both glumes are as long or longer than all of the florets
    Glume veins
    7 or more
    Inflorescence arrangement
    the spikelets are uniform
    Inflorescence axis orientation
    • the inflorescence axis is arched or curved outward
    • the inflorescence axis is straight
    Inflorescence branches
    the flowers are attached to branches rather than to the main axis of the inflorescence
    Inflorescence length
    80–300 mm
    Inflorescence type (general)
    the spikelets are borne on stalks or on branches
    Inflorescence type (specific)
    the inflorescence is branched, and the branches do NOT both grow from the same side of the plant AND look like spikes
    Inforescence position
    the spikelets are mainly carried at the end of the stem
    Lemma awn base
    • the awn is attached at the lower half of the lemma (it emerges from near the base of the lemma)
    • the awn is attached at the upper half of the lemma
    Lemma awn coiled
    the lemma awn is straight or twisted, but not coiled one half turn
    Lemma awn length
    3–35 mm
    Lemma awn number
    the lemma has one awn on it
    Lemma cross-section
    the lemma is flat or rounded if you cut across the midpoint
    Lemma keel hairs
    the keel of the lemma is rough, or has fine hairs
    Lemma surface
    the surface of the lemma is relatively smooth (not counting any longitudinal veins or hairs)
    Lemma tip
    the lemma tip is split into two or more points
    Lemma vein number
    • 5
    • 7 or more
    One or more florets
    there is more than one floret per spikelet
    Spikelet axis tip
    there is an extension of the spikelet axis beyond the tip of the spikelet
    Spikelet length
    14–26 mm
    Spikelets spiny
    the spikelets do not appear spiny
    Upper glume shape
    the upper glume is widest at or below the middle
  • Growth form
    Lifespan
    the plant lives only a single year or less
  • Leaves
    Leaf auricles
    the leaves do not have auricles
    Leaf blade width
    Up to 10 mm
    Leaf ligule length
    2–5 mm
    Leaf ligule type
    the leaf ligule is in the form of a membrane
    Leaf margin glands
    there are no glands along the edges of the leaf blade
    Leaf sheath closed around stem
    the margins of the leaf sheath are overlapping and not fused together except in the basal half (or less)
  • Place
    Habitat
    terrestrial
    New England state
    Massachusetts
    Specific habitat
    • man-made or disturbed habitats
    • meadows or fields

Wetland Status

Not classified

New England Distribution and Conservation Status

Distribution

Connecticut
absent
Maine
absent
Massachusetts
present
New Hampshire
absent
Rhode Island
absent
Vermont
absent

Conservation Status

Exact status definitions can vary from state to state. For details, please check with your state.

Massachusetts
unranked (S-rank: SNR)

Native to North America?

No

Sometimes Confused With

Avena sativa:
lemmas glabrous and inflorescence not secund (vs. A. strigosa, with lemmas scabrous near the apex and inflorescence secund).
Avena fatua:
lemmas pubescent with appressed, brown hairs and spikelets usually with 3 florets (vs. A. strigosa, with lemmas scabrous near the apex but otherwise without hairs and spikelets usually with 2 florets).

Family

Poaceae

Genus

Avena

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Information from Dichotomous Key of Flora Novae Angliae

3.  Avena strigosa Schreb. E

lopsided oat. MA. Fields, roadsides, disturbed soil.