What are auricles in grass?
auricles: short, often claw-like appendages at the base of the leaf blade which tend to clasp the sheath at the culm internode. The various shapes can be useful for identifying certain grasses.
What is auricle in agriculture?
Auricle. The auricles are located at the lower end of the leaf-blade, where it meets the leaf-sheath. They may be extended as a pair of claw-like projections. Auricles are most obvious on barley and are absent in oats.
What is auricle in leaf?
An auricle is typically a short claw-shaped, rounded, or pointed attachment at the base of a leaf blade, which tends to attach the lower part of the leaf to the stem of the leaf or blade.
Do all grasses have auricles?
Ligules and Auricles None of the cool-season turfgrasses have ligules that appear as a fringe of hairs, but this feature is common on many weed grasses and most warm-season turfgrasses. Auricles are slender extensions of the collar and are located at the junction of the leaf blade and leaf sheath.
What is itch grass?
Itchgrass (Rottboellia cochinchinensis (Lour.) Clayton) is an annual grass weed up to 3 m high, with a sturdy and erect culm, often tillering and rooting at the nodes. The inflorescence is a spike-like cylindrical raceme up to 15 cm long. The seeds are capsule-shaped (Ecoport, 2009).
What are three types of auricle?
The medical term for the outer ear is the auricle or pinna. The outer ear is made up of cartilage and skin. There are three different parts to the outer ear; the tragus, helix and the lobule.
What is the function of the auricle?
The auricle (pinna) is the visible portion of the outer ear. It collects sound waves and channels them into the ear canal (external auditory meatus), where the sound is amplified.
What are auricles biology?
Also called: pinna anatomy the external part of the ear. Also called: auricula biology an ear-shaped part or appendage, such as that occurring at the join of the leaf blade and the leaf sheath in some grasses.
Why is itch grass invasive?
It has been introduced into tropical America, as a potential pasture grass in the USA in the early 1900s and since the 1960s has been spread widely by contaminated rice seed, agricultural equipment and along transport routes in Central and South America, the Caribbean, and in the Gulf Coast region of the USA.
How do I get rid of Itchgrass?
Chemical. Several herbicides can be used for itchgrass pre-emergence and post-emergence control (Table 1). Pre-emergence herbicide options include clomazone+diuron or metribuzin, and pendimethalin.
Why are they called auricles?
Auricle is an Anglicization of Latin auricula, from auris ‘ear’ and -cula, a diminutive suffix. Auricle and auricula may refer to: Auricle Ensemble, chamber ensemble.
What is auricle in biology?
noun. Anatomy. the projecting outer portion of the ear; pinna. Also called auricular appendage. an ear-shaped appendage projecting from each atrium of the heart.