Hypericum canariense is a species of Hypericum known by the common name Canary Islands St. John's wort. It is the sole member of Hypericum sect. Webbia.
Among its numerous aliases in Spanish are granadillo, espanta demonios, flor de cruz, and leña de brujas.<ref>Template:Cite web</ref> In Finnish, the species is known as Kanariankuisma.<ref>Template:Cite web</ref> Its specific epithet canariense is a reference to the populousness of H. canariense in the Canary Islands. As such, its common names include Canary Islands St. John's wort or Canary Islands Hypericum.<ref>Template:Cite web</ref>
It is endemic to the Canary Islands and Madeira, where it grows in low-moisture scrub and forested slopes of the five westernmost islands from 150 to 800m.<ref name=Bramwell>Template:Cite book</ref>Template:Rp It is also known as an introduced species in Australia, New Zealand, and the US states of California and Hawaii, where it is an escaped ornamental plant and generally considered a minor noxious weed.<ref>Template:Cite web</ref>
Hypericum canariense grows in clayey or sandy soils, as well as in loam. It is found along creeklines and roadsides.<ref>Template:Cite web</ref> It is also prominent in dry scrub habitats and in mesic forests, often alongside Globularia salicina.<ref>Template:Cite web</ref>
The species is a flowering shrub growing Template:Convert in height. Its many stems bear waxy lance-shaped leaves Template:Convert long. The plentiful flowers each have five bright to deep yellow petals each just over a centimeter long and many yellowish whiskery stamens. It reproduces via the seed in its dehiscent dry fruits and also vegetatively via rhizome.<ref>Template:Cite web</ref>
The species has three accepted varieties:<ref>Template:Cite web</ref>
- H. canariense var. canariense
- H. canariense var. floribundum (Dryand. ex Ait.) Bornm.
- H. canariense var. platysepalum (Webb & Berth.) Ceb. & Ort.