Calystegia collina subsp. oxyphylla
- Taxonomic Rank: Subspecies
- Botanical Family: Convolvulaceae
- WCVP Morphological Data: Recorded natively as a subshrub or rhizomatous geophyte.
Calystegia collina subsp. oxyphylla (commonly known as Coast Range False Bindweed or Mt. Saint Helena morning-glory) is a rhizomatous plant within the Convolvulaceae family. It is found natively in North America. Within its native range, this subspecies is most commonly linked to temperate conditions. It is a naturally occurring subspecies of Calystegia collina, which is linked below, along with other subspecies of this species.