Dichelostemma congestum is a species of flowering plant known by the common name ookow or fork-toothed ookow. It is native to California, Oregon and Washington.

Its tall, thin, naked stem is topped with an inflorescence packed densely with six to 15 flowers, each about a centimeter wide and long, with usually six petal-like lobes in shades of bright purple.

It was first published in 1811 as Brodiaea congesta.

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