Ontario Weeds: Silky bent
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Excerpt from Publication 505, Ontario Weeds, Order
Table of Contents
- Other Names
- General Description
- Stems and Roots
- Flowers and Fruit
- Similar Species
- For more information...
Name: Silky bent grass, Agrostis
Other Names: APESV, agrostide, jouet-du-vent,
Loose silky bent grass, Wind grass, Apera spica-venti (L).
Family: Grass Family (Gramineae)
General Description: Winter annual
or annual, reproducing only be seed.
Photos and Pictures
Silky bent grass. A. infestation in winter wheat
B. shattered seed on soil surface under A
Stem and leaf-base characteristics of a typical grass.
Stems & Roots: Stems erect to
a height or 150 cm (60 in.) unbranched, sheaths smooth with separate,
membranous margins; ligule membranous 2-14mm (1/12 - 1/2 in.), short
and pointed in very young plants but lengthening with age, becoming
rather firm and the tip somewhat torn or toothed, its margins continuous
with the membranous margins of the sheath; no auricles; leaf blades
long (up to 30cm, 12in.), flat, 0.5-6mm (1/50 - 1/4 in.) wide, gradually
tapering towards the tip; stem nodes distinctly darker than the
stem or leaf sheaths.
Flowers & Fruit: Panicle at first
narrow and dense, becoming open and loosely branched, up to 35cm
(14in.) long and 25cm (10in.) wide, with numerous fine branches
each ending in a single spikelet 1.5 - 3.2 (1/16 - 1/8 in.) long;
the while inflorescence conspicuously reddish at maturity; each
spikelet containing a single floret ("seed") with a slender
awn 4-9mm (1/6 - 3/8 in.) long; seed without its awn is about 1.6mm
(1/15in.)long. Flowers from June to August.
Habitat: Originally introduced from
Europe. Silky bent grass is a common weed in fields of winter wheat
and fall rye on sandy soils in the "tobacco belt" of southwestern
Ontario. It also occurs in ditches and other non-cultivated areas.
Similar Species: It is distinguished from
other common annual grasses by its winter annual habit, its slender
stems and leaves with long, 1-several-pointed, membranous ligules,
its loose, open,reddish, mature inflorescence and the short, straight
awn on each seed.
... on general Weed
... on weed identification, order OMAFRA
Publication 505: Ontario Weeds
... on weed control, order OMAFRA
Publication 75: Guide To Weed Control
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