Hypericum perforatum |
Hypericum denticulatum |
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Chase-devil, common St. John's-wort, Klamath weed, millepertuis commun, Tipton's weed |
coppery St. John's wort |
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Habit | Herbs perennial, erect, branching at usually aerenchymatous base and in inflorescence, 2–7 dm. | |
Stems | internodes 4-lined. |
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Leaves | (main stem) spreading to appressed, sessile; blade usually broadly to narrowly ovate, rarely elliptic or lanceolate, 4–20 × 5–15(–18) mm, mostly shorter than internodes, leathery, margins plane, apex acute to subrounded, densely gland-dotted, basal veins 1–5, if 1, midrib with 2–3 pairs of branches. |
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Inflorescences | broadly pyramidal to corymbiform, to 25-flowered, branching mostly dichasial. |
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Flowers | 5–13 mm diam.; sepals ovate or lanceolate to elliptic or obovate, subequal, 3–8 × 1.5–4 mm, margins sometimes ciliate, not setulose-ciliate, apex acute; petals orange-yellow, obovate, 5–10 mm; stamens 50–80, irregularly grouped; styles 2–4 mm; stigmas clavate. |
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Capsules | ovoid to rostrate-subglobose, 3–5 × 2–3 mm. |
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Seeds | 0.4–0.7 mm; testa obscurely linear-reticulate to finely ribbed-scalariform. |
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Hypericum perforatum |
Hypericum denticulatum |
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Phenology | Flowering summer–early fall (Jun–Sep). | |
Habitat | Wet woods, marshes, bogs | |
Elevation | 0–400 m [0–1300 ft] | |
Distribution |
AR; CA; CO; CT; DC; DE; IA; ID; IL; IN; KS; KY; MA; MD; ME; MI; MN; MO; MT; NC; ND; NE; NH; NJ; NM; NV; NY; OH; OK; OR; PA; RI; SC; SD; TN; TX; VA; VT; WA; WI; WV; WY; BC; MB; NB; NF; NS; ON; PE; QC; Europe; Asia (sw Arabia, China, India, Mongolia, Siberia); n Africa [Also introduced widely elsewhere]
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AL; DE; GA; NC; NJ; NY; PA; SC; TN; VA
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Discussion | 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.) |
D. H. Webb (1980) regarded the disjunct populations in North Carolina and Tennessee as possible relicts and the Alabama one as due to recent introduction. J. R. Allison (2011) agreed and, in his opinion, the Pennsylvania and Virginia records are historical, and Hypericum denticulatum is likely adventive in Georgia. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 6, p. 99. | FNA vol. 6, p. 89. |
Parent taxa | ||
Sibling taxa | ||
Subordinate taxa | ||
Synonyms | H. angulosum, H. denticulatum var. ovalifolium, H. laevigatum, H. virgatum var. ovalifolium | |
Name authority | Linnaeus: Sp. Pl. 2: 785. (1753) | Walter: Fl. Carol., 190. (1788) |
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