Apera spica-venti

Species category

Weed

Common name

loose silkybent

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

Lanceolate

Size

  • Length: 2 mm
  • Width: 0.5 mm
  • Thickness: 0.5 mm

Color

Yellowish-brown

Texture

Short hispid hairs on upper part of lemmaLemma:
One of two bracts of the grass floret; it is located on the side nearest the embryo and opposite the rachilla.

Lemma

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

Palea

Enclosed by lemmaLemma:
One of two bracts of the grass floret; it is located on the side nearest the embryo and opposite the rachilla.

Other structures

Long thin awnsAwn:
A narrow, bristle-like organ, as on the glumes or lemmas of grasses (Poaceae).
at tip of lemmaLemma:
One of two bracts of the grass floret; it is located on the side nearest the embryo and opposite the rachilla.
; vestigial rachillaRachilla:
The axis of a spikelet.
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Identification notes

The caryopsisCaryopsis:
The single-seeded fruit or grain of the grass family (Poaceae); the fruit wall (pericarp) is united with the seed coat (testa).
is yellowish and semi-soft. 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.
are one-flowered and disarticulation is above the glumesGlume:
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

Included

More information

For more information, see ISMA fact sheet.

Nomenclature

Family

Poaceae

Valid name

Apera spica-venti (L.) P. Beauv.

Synonyms

Agrostis spica-venti L.

 Apera spica-venti.  Long, thin awns at the tip of the lemma. Vestigial rachilla.
Apera spica-venti. Long, thin awns at the tip of the lemma. Vestigial rachilla.
 Apera spica-venti . The caryopsis is yellowish and semi-soft. Spikelets are one-flowered, and disarticulation is above the glumes.
Apera spica-venti. The caryopsis is yellowish and semi-soft. Spikelets are one-flowered, and disarticulation is above the glumes.