Very little seems to have been written about this species and it is not included in most regional wildflower books. Despite its common name, it is herbaceous and rarely stands more than 2-3 feet tall. The leaves are very linear and clasp the stem. Each leaf is about 1/2-3/4 inch long.
Flowering occurs from spring through fall. Each bloom is no more than 1/4 wide. The flowers are somewhat rose-shaped, but comprised of 4 pale yellow to cream white petals. I suspect that they are mostly bee pollinated as others in this genus are. The weevils in the above photo were not pollinating the blooms.
Shrubby primrosewillow is an interesting, but not particularly attractive species. It has never, to my knowledge, been offered for sale commercially. I suspect it would be easy to propagate from the ripe seed once the capsules have matured. If you choose to try it in a landscape, make sure you are adding it to a very moist site.