Philadelphus

Three ships of the United States Navy have been named Althea, after a shrub of the mallow family; the rose of sharon or a hollyhock.

• USS Althea (1862) was a collier that served during the Civil War.
• USS Althea (1863) was a tugboat that served during the Civil War.
• USS Althea (SP-218) was a motorboat built in 1907.

•  This article incorporates text from the public domain Dictionary of American Naval Fighting Ships. The entry can be found here.