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Dichanthelium xanthophysum — pale-leaved rosette-panicgrass

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Facts

Pale-leaved rosette-panicgrass is native to northeastern North America. In New England it is a grass of well-drained soils of woodlands, heaths and rights-of-way.

Habitat

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

New England distribution

Adapted from BONAP data

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North America distribution

Adapted from BONAP data

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Characteristics

Habitat
terrestrial
New England state
  • Connecticut
  • Maine
  • Massachusetts
  • New Hampshire
  • Vermont
Leaf blade width
7–23 mm
Inflorescence branches
the flowers are attached to branches rather than to the main axis of the inflorescence
Spikelet length
3.2–4.1 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 sheath hair type
  • there are hairs on the surface of the leaf sheath, and some of the hairs have blisters at their bases
  • there are no hairs on the surface of the leaf sheath
Leaf ligule length
0.3–0.5 mm
Show all characteristics
  • Flowers

    Anther number
    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
    • 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
    70–140 mm
    Inflorescence length to width ratio
    At least 2
    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
    Inflorescence width
    10–50 mm
    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 cross-section
    the lemma is flat or rounded if you cut across the midpoint
    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
    3.2–4.1 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
  • 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 base
    the leaf blade cuts in abruptly to the narrower base, or has rounded lobes on either side of the base (heart-shaped)
    Leaf blade width
    7–23 mm
    Leaf ligule length
    0.3–0.5 mm
    Leaf ligule type
    the leaf ligule is in the form of a membrane with 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 hair type
    • there are hairs on the surface of the leaf sheath, and some of the hairs 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
  • Place

    Habitat
    terrestrial
    New England state
    • Connecticut
    • Maine
    • Massachusetts
    • New Hampshire
    • Vermont
    Specific habitat
    • man-made or disturbed habitats
    • meadows or fields
    • shrublands or thickets
    • woodlands
  • Stem, shoot, branch

    Stem spacing
    • the stems grow close together in compact clusters or tufts
    • the stems grow singly or a few together (they may form diffuse colonies)

Wetland status

Not classified

In New England

Distribution

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

Conservation status

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

Connecticut
historical (S-rank: SH), special concern, extirpated (code: SC*)
Massachusetts
fairly widespread (S-rank: S4)
Vermont
uncommon (S-rank: S3)

From Flora Novae Angliae dichotomous key

16.  Dichanthelium xanthophysum (Gray) Gould N

pale-leaved rosette-panicgrass. Panicum xanthophysum Gray • CT, MA, ME, NH, VT. Dry-mesic to xeric, well drained soils of woodlands, heaths, and cleared rights-of-way.

Native to North America?

Yes

Sometimes confused with

Dichanthelium boreale:
spikelets 2-2.2 mm long, panicle branches ascending to spreading, and ligules comprised entirely of hairs (vs. D. xanthophysum, with spikelets 3.2-4.1 mm long, panicle branches erect to strictly ascending, and ligules comprised of an apically ciliate membrane).

Synonyms

  • Panicum xanthophysum Gray

Family

Poaceae