Data collection in progress. Complete data coming soon.

Elymus macgregorii R. Brooks & J.J.N. Campb.

early wild-rye

New England Distribution

Adapted from BONAP data

Where native and non-native distributions co-occur in a county, only the native distribution is shown.

North America Distribution

Adapted from BONAP data

Enlarge

Facts About

Early wild-rye is a rare but widespread grass confined to rich moist riparian floodplain and deciduous forests. This species is most likely to be confused with common eastern wild-rye (Elymus virginicus).

Habitat

Floodplain (river or stream floodplains), forests

Characteristics

Habitat
terrestrial
New England state
  • Connecticut
  • Maine
  • Massachusetts
  • New Hampshire
  • Rhode Island
  • Vermont
Leaf blade width
7–15 mm
Inflorescence branches
there are no branch points between the base of the inflorescence axis and the flowers, or they are not obvious
Spikelet length
10–15 mm
Glume relative length
both glumes are as long or longer than all of the florets
Awn on glume
the glume has an awn
One or more florets
there is more than one floret per spikelet
Lemma awn length
15–30 mm
Leaf sheath hair type
  • there are hairs on the surface of the leaf sheath, but the hairs do not have blisters at their bases
  • there are no hairs on the surface of the leaf sheath
Leaf ligule length
0.4–0.9 mm
Anther length
2–4 mm
Show All Characteristics
  • Flowers
    Anther length
    2–4 mm
    Anther number
    3
    Awn on glume
    the glume has an awn
    Bristles below spikelets
    no
    Floret lower bract texture
    the lemma is thin and flexible
    Floret number
    2–4
    Floret types within spikelet
    there are at least two distinct forms of florets within one spikelet
    Glume awn length
    10–25 mm
    Glume keel
    NA
    Glume relative length
    both glumes are as long or longer than all of the florets
    Glume shape
    the glume is flat or curved in cross-section
    Glumes per spikelet
    2
    Inflorescence axis hairs
    • the inflorescence axis is rough and feels like sand-paper
    • the inflorescence axis is smooth and has no hairs
    Inflorescence axis orientation
    the inflorescence axis is straight
    Inflorescence branch length
    0 cm
    Inflorescence branch roughness
    NA
    Inflorescence branches
    there are no branch points between the base of the inflorescence axis and the flowers, or they are not obvious
    Inflorescence branches coming off the lowest stem node
    0
    Inflorescence crowding
    NA
    Inflorescence length
    40–120 mm
    Inflorescence length to width ratio
    2.4–3
    Inflorescence type (general)
    the inflorescence is a spike, or is spike-like, lacking obvious branches
    Inflorescence type (specific)
    the inflorescence is a spike (a long unbranched stem with flowers along it that lack stalks)
    Inflorescence width
    17–40 mm
    Inforescence position
    the spikelets are mainly carried at the end of the stem
    Lemma awn base
    the awn is attached right at the tip of the lemma
    Lemma awn coiled
    the lemma awn is straight or twisted, but not coiled one half turn
    Lemma awn length
    15–30 mm
    Lemma awn number
    the lemma has one awn on it
    Lemma awn orientation
    the awn of the lemma is straight
    Lemma hairs
    the lemma is hairless between the veins
    Lemma marginal vein hairs
    • the marginal vein of the lemma has fine hairs on it
    • the marginal vein of the lemma is hairless
    Lemma surface
    the surface of the lemma is relatively smooth (not counting any longitudinal veins or hairs)
    Lemma tip
    the lemma tip is a simple point, with or without an awn (long narrow extension ending in a point)
    Lemma tip shape
    the lemma tip tapers to a long narrow point (it may or may not also have an awn or teeth at the tip)
    Lemma vein number
    • 5
    • 7 or more
    Lemma vein orientation
    the veins on the lemma stay roughly parallel throughout
    Lower glume length
    8–19 mm
    Lower glume relative length
    the lower glume is nearly as long, or as long as, the upper glume
    One or more florets
    there is more than one floret per spikelet
    Palea length
    6–10 mm
    Reproductive system
    all the flowers on the plant have both carpels and stamens (synoecious)
    Spikelet disintegration
    • the spikelet breaks off above the glumes, so that after the florets fall off, the glumes remain
    • the spikelet breaks off below the glumes
    Spikelet length
    10–15 mm
    Spikelet number per node
    Up to 3
    Spikelet pedicel
    the spikelets do not have pedicels
    Spikelet pedicel length
    0 mm
    Spikelet position
    NA
    Spikelet shape
    • the spikelets are elliptic (widest in the middle, tapering to the ends) in profile
    • the spikelets are oblong (rectangular, but with rounded ends) in profile
    Spikelets per panicle branch
    0
    Spikelets spiny
    the spikelets do not appear spiny
    Tip of glume
    the tip of the glume is not divided (though it may have an awn on it)
    Upper glume length
    8–19 mm
    Upper glume relative length
    the upper glume is more than one half as long as the lowest lemma
  • Fruits or seeds
    Groove on seed
    the caryopsis has a groove running most of its length
  • Growth form
    Horizontal rooting stem
    no
    Lifespan
    the plant lives more than two years
    Rhizomes
    no
    Roots
    there are only slender roots on the plant
  • Leaves
    Basal leaves
    the plant has few or no leaves coming from the base of the flowering stem
    Leaf auricles
    the leaves have auricles
    Leaf blade cross-section
    the leaf blade is more or less flat in cross-section, or slightly folded or rolled inwards
    Leaf blade hairs
    • the leaf blade is hairless, but it may have tiny prickles that give it a sand-papery feel
    • the leaf blade is hairy
    Leaf blade width
    7–15 mm
    Leaf ligule length
    0.4–0.9 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 leaf sheath does not quite meet at the opposite side of the stem
    Leaf sheath hair type
    • there are hairs on the surface of the leaf sheath, but the hairs do not have blisters at their bases
    • there are no hairs on the surface of the leaf sheath
    Leaf sheath hairs
    • there are hairs on the surface of the leaf sheath
    • there are no hairs on the surface of the leaf sheath
    Orientation of topmost leaf
    the flag leaf is held outward at more than a 45 degree angle from the stem, or it curves downwards from the horizontal
  • Place
    Habitat
    terrestrial
    New England state
    • Connecticut
    • Maine
    • Massachusetts
    • New Hampshire
    • Rhode Island
    • Vermont
    Specific habitat
    • forests
    • river or stream floodplains
  • Stem, shoot, branch
    Hairs at nodes
    the stem nodes are hairless or they have very sparse hairs
    Plant height
    40–120 cm
    Stem node number
    4–8
    Stem orientation
    • the stems are upright
    • the stems trail at the base, but turn upwards at the tips
    Stem spacing
    the stems grow close together in compact clusters or tufts

Wetland Status

Not classified

New England Distribution and Conservation Status

Distribution

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

Conservation Status

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

Maine
rare (S-rank: S2), special concern (code: SC)
Massachusetts
rare (uncertain) (S-rank: S2?), #NAME? (code: #NAME?)
New Hampshire
extremely rare (S-rank: S1), endangered (code: E)
Rhode Island
extremely rare (S-rank: S1), concern (uncertain) (code: C*)
Vermont
historical (S-rank: SH)

Native to North America?

Yes

Sometimes Confused With

Elymus virginicus
Elymus glabriflorus

Family

Poaceae

Genus

Elymus

Need Help?

Get Help

Information from Dichotomous Key of Flora Novae Angliae

5.  Elymus macgregorii R. Brooks & J.J.N. Campb. NC

early wild-rye. CT, MA, ME, NH, RI, VT. Rich, mesic soils of high-terrace riparian floodplains 
and deciduous forests, often associated with Acer saccharum, Tilia americana, and/or Fraxinus americana.