What common name is used for Rubus rolfei?

Rubus rolfei is commonly known as Creeping Bramble. This name reflects the plant's habit of forming low-growing, sprawling stems that root at the nodes, creating a mat-like appearance on the ground. The term "bramble" is often associated with thorny shrubs in the Rubus genus, which includes various species of blackberry and raspberry. In the case of Creeping Bramble, it retains this nomenclature due to its growth characteristics yet differs from more upright bramble types.

The other names listed do not correspond to Rubus rolfei. Hypericum refers to a genus of flowering plants commonly known as St. John's wort. Boston Ivy pertains to Parthenocissus tricuspidata, a climbing vine with distinctive leaves that turn red in fall. Blue Star Creeper is commonly associated with Isotoma fluviatilis, known for its small blue flowers and spreading habit, but it is not related to brambles. Hence, the name Creeping Bramble fittingly encapsulates the nature and appearance of Rubus rolfei, making it the most appropriate common name among the options provided.