Hastingsia bracteosa is a rare species of flowering plant in the agave subfamily of the asparagus family known by the common name large-flowered rushlily.

[1] This plant grows from a dark-coated bulb and produces gray-green leaves up to 52 centimeters long.

[1] This plant grows on boggy open slopes and in other wetland habitat such as fens, springs and wet meadows, often in areas with serpentine soils.

Associated plant species include Darlingtonia californica, Helenium bigelovii, and Chamaecyparis lawsoniana.

It is often found in serpentine fens dominated by Darlingtonia and with Gentiana setigera, Castilleja miniata ssp.