Panicum capillare

Species category

Weed

Common name

panicgrass, ticklegrass, tumble panic, tumbleweed grass, witches hair, witchgrass, annual witchgrass, common panic grass, common witchgrass

Diagnostic characters

Planting unit

FloretFloret:
A small flower in a clustered inflorescence (e.g., sunflower, grasses). In grasses, a floret consists of the lemma, palea, stamens, and pistil.

Shape

EllipticElliptic:
Outline of an ellipse; greatest width midway sloping to an equally pointed apex and base.

Size

  • Length 1.5–1.7 mm
  • Width 0.8–1 mm
  • Thickness 0.5–0.7 mm

Color

Olive-brown floretFloret:
A small flower in a clustered inflorescence (e.g., sunflower, grasses). In grasses, a floret consists of the lemma, palea, stamens, and pistil.
with light yellowish nerves

Texture

Shiny and smooth

Lemma

Slightly arched and thickest midway

Palea

Mostly flat but the full width of the floretFloret:
A small flower in a clustered inflorescence (e.g., sunflower, grasses). In grasses, a floret consists of the lemma, palea, stamens, and pistil.

Other structures

Scar is small and inconspicuous.

Identification notes

Units usually appear as floretsFloret:
A small flower in a clustered inflorescence (e.g., sunflower, grasses). In grasses, a floret consists of the lemma, palea, stamens, and pistil.
. However, spikeletsSpikelet:
One or more florets that are subtended by a pair of bracts called glumes. Spikelets are pedicellate if located on a pedicle and sessile if attached directly to the rachis. Often spikelets with single florets have remnants of a second floret, usually a lemma.
occur and are composed of a papery first and second glumeGlume:
The pair of chaffy bracts that occur at the base of a grass spikelet, often completely enclosing it.
, a papery sterile lemmaLemma:
One of two bracts of the grass floret; it is located on the side nearest the embryo and opposite the rachilla.
, and then floretFloret:
A small flower in a clustered inflorescence (e.g., sunflower, grasses). In grasses, a floret consists of the lemma, palea, stamens, and pistil.
. Second glumeGlume:
The pair of chaffy bracts that occur at the base of a grass spikelet, often completely enclosing it.
and sterile lemmaLemma:
One of two bracts of the grass floret; it is located on the side nearest the embryo and opposite the rachilla.
are pointed.

Noxious weed seed categories

Not listed

AOSA examination list

Included

More information

For more information, see ISMA fact sheet.

Nomenclature

Family

Poaceae

Valid name

Panicum capillare L.

Synonyms

Panicum barbipulvinatum Nash
Panicum capillare L. var. agreste Gattinger
Panicum capillare L. ssp. barbipulvinatum (Nash) Tzvelev
Panicum capillare L. var. brevifolium Vasey ex Rydb. & Shear
Panicum capillare L. var. barbipulvinatum (Nash) R.L. McGregor
Panicum capillare L. var. occidentale Rydb.

 Panicum capillare . When present, spikelets are composed of a papery first and second glume, a papery sterile lemma, and a floret. 
Panicum capillare. When present, spikelets are composed of a papery first and second glume, a papery sterile lemma, and a floret. 
From Left to Right: 1.  Panicum capillare  2.  Panicum coloratum  3.  Panicum virgatum . The second glume and sterile lemma are pointed.
From Left to Right: 1. Panicum capillare 2. Panicum coloratum 3. Panicum virgatum. The second glume and sterile lemma are pointed.