Dichanthelium leibergii

Species category

Weed

Common name

Leiberg's panicum

Diagnostic characters

Planting unit

SpikeletSpikelet:
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.

Shape

OvalOval:
Broadly elliptic.

Size

  • Length 2.5–4 mm
  • Width 1.9–2 mm
  • Thickness 1.5–1.8 mm

Color

Light brown

Texture

SpikeletSpikelet:
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.
is papery with longitudinal ribs. 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.
is shiny and striate.

Lemma

Surface is shiny and striate.

Palea

Surface is shiny and striate.

Other structures

GlumesGlume:
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.
often have long hairs coming from small tubercles.

Identification notes

Units are usually a papery spikeletSpikelet:
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.
, but may often be a shiny floretFloret:
A small flower in a clustered inflorescence (e.g., sunflower, grasses). In grasses, a floret consists of the lemma, palea, stamens, and pistil.
. One of the papery spikeletSpikelet:
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.
covers is a sterile lemmaLemma:
One of two bracts of the grass floret; it is located on the side nearest the embryo and opposite the rachilla.
which is subtended by a small glumeGlume:
The pair of chaffy bracts that occur at the base of a grass spikelet, often completely enclosing it.
.

Noxious weed seed categories

Not listed

AOSA examination list

Not included

Nomenclature

Family

Poaceae

Valid name

Dichanthelium leibergii (Vasey) Freckmann

Synonyms

Panicum leibergii (Vasey) Scribn.
Panicum leibergii (Vasey) Scribn. var. baldwinii Lepage
Panicum scoparium Lam. var. leibergii Vasey
Panicum scribnerianum Nash var. leibergii (Vasey) Scribn.

 Dichanthelium leibergii.  Units are seen as a papery spikelet or a shiny floret. One of the papery spikelet covers is a sterile lemma, which is subtended by a small glume.
Dichanthelium leibergii. Units are seen as a papery spikelet or a shiny floret. One of the papery spikelet covers is a sterile lemma, which is subtended by a small glume.