Observations on the blooming of orchard grass flowers
1925
Wolfe, T.K.
Twenty-two heads of orchard grass were under observation during a portion of their blooming periods and 5,861 flowers were observed in the actual process of blooming. The time from the beginning of opening of the flowers until they were completely opened averaged 15 minutes. The elapse of time from the beginning of opening until the anthers became pendent averaged 37.5 minutes and until the flowers closed 2 hours and 26 minutes. It required 6.7 days on the average for all the flowers on a single head to bloom and 13.5 days for all the flowers on a single plant. Of all the flowers under observation, 76.9% bloomed from sunrise to noon, 6.6% from noon to sunset, 0.3% from sunset to midnight, and 16.3% from midnight to sunrise. The peak of the blooming occurred between 8 and 9 a.m. As a rule the first flowers to bloom on a head are in the apex, but there is apparently no definite order in the other parts of the head. In a single spikelet the first or lowest flower blooms first followed in order by the second, third, etc., at intervals of about 30 hours.
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