Danthonia californica Danthonia californica fruits with mm ruler on right. Danthonia californica seedlings germinated within a growth chamber set at a 25/15°C (77/59°F) day/night temperature with a 12-hour day photoperiod of cool-white fluorescent light. Danthonia californica seedlings growing in 48-cell liners at the Berry Seed Bank research greenhouse in Portland, Oregon. Danthonia californica ligule.