Deschampsia cespitosa

Species category

Flower

Common name

tufted hairgrass

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

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.
and a dark brown caryopsisCaryopsis:
The single-seeded fruit or grain of the grass family (Poaceae); the fruit wall (pericarp) is united with the seed coat (testa).

Texture

CallusCallus:
The hard base of grass florets or spikelets, just above the point of disarticulation.
and rachillaRachilla:
The axis of a spikelet.
are copiously long-pubescent.

Lemma

Smooth; awnAwn:
A narrow, bristle-like organ, as on the glumes or lemmas of grasses (Poaceae).
the length 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.
arises from near base.

Palea

Bulges up about midway

Other structures

RachillaRachilla:
The axis of a spikelet.
about half the length of the lemmaLemma:
One of two bracts of the grass floret; it is located on the side nearest the embryo and opposite the rachilla.

Identification notes

The floretsFloret:
A small flower in a clustered inflorescence (e.g., sunflower, grasses). In grasses, a floret consists of the lemma, palea, stamens, and pistil.
are usually singular even though they are borne in two-flowered 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.
. The awnAwn:
A narrow, bristle-like organ, as on the glumes or lemmas of grasses (Poaceae).
is unusual by arising so near 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.
base.

Noxious weed seed categories

Not listed

AOSA examination list

Not included

Nomenclature

Family

Poaceae

Valid name

Deschampsia cespitosa (L.) P. Beauv.

Synonyms

Deschampsia cespitosa (L.) P. Beauv. ssp. cespitosa

 Deschampsia cespitosa.  Pubescent florets with dark brown caryopses.
Deschampsia cespitosa. Pubescent florets with dark brown caryopses.