This non-native to California was seen in a grassy patch among the generally oak woodland dominated landscape. This grass stood at about 55 cm in height.
Lech keyed this...
The fruits were smaller than the ones I normally see, each less than half an inch.
Briza is a genus of annual and perennial grasses in the family Poaceae, native to northern temperate regions. The group is generally referred to as the quaking grasses because the flowers and seedheads shake on their stalks in the slightest breeze. Some of its members are grown as ornamental plants.