Hypericum perforatum
Hypericum lobocarpum
Chase-devil, common St. John's-wort, Klamath weed, millepertuis commun, Tipton's weed
five-lobe St. John's-wort
internodes 4-lined at first, soon 2-lined to terete.
blades narrowly oblong to oblanceolate or linear, 35–50 × 3–11 mm, base articulated, narrowly cuneate to attenuate, margins recurved to revolute, apex apiculate-rounded to subacute, midrib with 12–14 pairs of branches.
globose-cylindric to shortly and broadly pyramidal, 5–25-flowered from apical node, with 3–15-flowered dichasia from 1–3 proximal nodes.
10–15 mm diam.;
sepals deciduous, not enclosing capsule, 5, narrowly elliptic to narrowly oblong or oblanceolate-spatulate, subequal to equal, (3.5–)4–4.5 × 0.8–1.5(–2) mm, basal veins 3–7;
petals 5, golden yellow, obovate-oblanceolate, 6–7(–8) mm;
stamens deciduous, 100–150;
ovary (3–)4–5-merous.
narrowly ovoid-conic to ovoid, 5.5–7 × 2.5–3.5 mm, notably lobed.
not carinate, 1.2–1.5 mm;
testa linear-reticulate.
= 18.
Hypericum perforatum
Hypericum lobocarpum
Subspecies 4 (1 in the flora).
Hypericum perforatum has been introduced into various parts of the world, including North America, where only subsp. perforatum is represented. The range of variation in the flora area is less than occurs in Europe, and signs of hybridization that are common there are absent in North America.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Hypericum lobocarpum usually can be distinguished from H. densiflorum by the five-merous ovary; its lobed capsule is a better differentiating characteristic. Hybrid intermediate forms sometimes occur in northwestern Alabama. The South Carolina population (from Allendale County), although well within the area of H. densiflorum and well established, has fruits typical of H. lobocarpum and appears to be either an outlier or an introduction. Hypericum ×dawsonianum Rehder, apparently H. lobocarpum × prolificum and intermediate in form between the presumed parents, is known in cultivation only.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
- Local floras:
BC, 
OR, 
WA - Local Web sites:
CalFlora, CalPhotos, 
Flora NW, 
Go Botany, 
IL Wildflowers, 
KS Wildflowers, 
MD Biodiversity, 
MI Flora, 
MN Wildflowers, 
MO Plants, 
PNW Herbaria, Turner Photog. 
WildflowerSearch
iNaturalist (observations)
USDA Plants Database- LBJ Wildflower Center
- SEINet
- Plants of the World Online
- Encyclopedia of Life
- Wikipedia
- Google Image Search
LA Plants
