Coast button grass

The seedling is initially erect but later sprawling. The base of the seedling is red (green in button grass). The ligule is a low, papery rim capped with short hairs.
A key identification feature is the long, obvious hairs scattered along the leaf margins, especially close to the leaf sheath.
Mature plants can grow up to 0.7 m tall.
The seed head has one to nine spikes, 12–65 mm long (usually considerably longer than button grass).