Dichanthelium wrightianum (Scribn.) Freckmann

Wright's rosette-panicgrass

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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

Wright's rosette-panicgrass is native to coastal states from Texas to New England. In our region it is found on the coastal plain of Massachusetts and Rhode Island, on pond shores and in temporary pools.

Habitat

Shores of rivers or lakes

Characteristics

Habitat
wetlands
New England state
  • Massachusetts
  • Rhode Island
Leaf blade width
2–5 mm
Inflorescence branches
the flowers are attached to branches rather than to the main axis of the inflorescence
Spikelet length
0.8–1.1 mm
Glume relative length
neither glume is quite as long as all of the florets
Awn on glume
the glume has no awn
One or more florets
  • there is more than one floret per spikelet
  • there is one floret per spikelet
Lemma awn length
0 mm
Leaf ligule length
1.5–3 mm
Show All Characteristics
  • Flowers
    Anther number
    0–3
    Awn on glume
    the glume has no awn
    Bristles below spikelets
    no
    Floret lower bract texture
    the lemma is hard and firm
    Floret number
    1–2
    Floret types within spikelet
    • NA
    • there are at least two distinct forms of florets within one spikelet
    Glume relative length
    neither glume is quite as long as all of the florets
    Glume shape
    the glume is flat or curved in cross-section
    Glume veins
    • 1
    • 3
    • 5
    • 7 or more
    Inflorescence arrangement
    the spikelets are uniform
    Inflorescence axis orientation
    the inflorescence axis is straight
    Inflorescence branches
    the flowers are attached to branches rather than to the main axis of the inflorescence
    Inflorescence length
    25–55 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
    Lemma awn base
    NA
    Lemma awn coiled
    NA
    Lemma awn length
    0 mm
    Lemma awn number
    the lemma has no awn
    Lemma awn orientation
    NA
    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 vein number
    • 3
    • 5
    • 7 or more
    One or more florets
    • there is more than one floret per spikelet
    • there is one floret per spikelet
    Palea relative length
    palea is one half to fully as long as lemma
    Spikelet axis tip
    there is no extension of the spikelet axis beyond the tip of the spikelet
    Spikelet length
    0.8–1.1 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 more than two years
    Roots
    the plant has a root mass with a hardened top
  • Leaves
    Basal leaves
    the plant has large or prominent tufts of leaves at the base of the flowering stem
    Leaf auricles
    the leaves do not have auricles
    Leaf blade width
    2–5 mm
    Leaf ligule length
    1.5–3 mm
    Leaf ligule type
    the leaf ligule is in the form of fine hairs
    Leaf sheath closed around stem
    the margins of the leaf sheath are overlapping and not fused together except in the basal half (or less)
    Leaf sheath hairs
    • there are hairs on the surface of the leaf sheath
    • there are no hairs on the surface of the leaf sheath
  • Place
    Habitat
    wetlands
    New England state
    • Massachusetts
    • Rhode Island
    Specific habitat
    shores of rivers or lakes
  • Stem, shoot, branch
    Stem spacing
    the stems grow close together in compact clusters or tufts
    Stem thickness at base
    0.3–0.8 mm

Wetland Status

Not classified

New England Distribution and Conservation Status

Distribution

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

Conservation Status

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

Massachusetts
uncommon (S-rank: S3), special concern (code: SC)
Rhode Island
extremely rare (S-rank: S1), concern (code: C)

Native to North America?

Yes

Sometimes Confused With

Dichanthelium acuminatum:
spikelets 1.3-2.6 mm long and stems thicker than 0.8 mm (vs. D. wrightianum, with spikelets 0.8-1.1 mm long and stems 0.3-0.8 mm thick).

Synonyms

  • Panicum acuminatum Sw. var. wrightianum (Scribn.) C.F. Reed
  • Panicum minutulum Desv.
  • Panicum wrightianum Scribn.

Family

Poaceae

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Information from Dichotomous Key of Flora Novae Angliae

15.  Dichanthelium wrightianum (Scribn.) Freckmann N

Wright’s rosette-panicgrass. Panicum acuminatum Sw. var. wrightianum (Scribn.) C.F. Reed; 
 P. minutulum Desv.; P. wrightianum Scribn. • MA, RI. Pond shores and exposed, vegetated floors of temporary pools on the coastal plain.