Wild Grasses of Ainsworth: Timothy

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This grass is often cultivated as fodder for livestock. According to Wikipedia:

Timothy-grass was unintentionally introduced to North America by early settlers, and was first described in 1711 by John Hurd from plants growing in New Hampshire. Hurd named the grass "hurd grass" but a farmer named Timothy Hanson began to promote cultivation of it as a hay about 1720, and the grass has been known by its present name since then. Timothy has now become naturalized throughout most of the US and Canada.

This inflorescence looks to me as if it's gone to seed: