Neoholmgrenia hilgardii is an annual flowering plant in the Onagraceae family with the common name Hildgard's suncup.

[1][2][3] This species was first described as Oenothera hilgardii by Greene, and was transferred to the genus Neoholmgrenia in 2009 by W.L.Wagner & Hoch.

[4] Neoholmgrenia hilgardii is a small annual plant up to 15 cm tall, with a crowded tuft of leaves and yellow flowers atop nearly bare stems, which may be single or grow in a cluster.

The proportionally-large lemon yellow flowers appear in late spring and have 4 ovate petals up to 5 mm long, born singly on short pedicels.

[2][3] The very similar species Neoholmgrenia andina is distinguished mostly by much smaller flowers and has a wider range including Oregon and Idaho.