Hypericum perforatum |
Hypericum cistifolium |
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Chase-devil, common St. John's-wort, Klamath weed, millepertuis commun, Tipton's weed |
roundpod St. Johnswort |
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Habit | Shrubs, erect, unbranched or with relatively short branches and sometimes 1–2 branches ascending from proximal nodes, 5–13 dm. | |
Stems | internodes 4-lined at first, then terete. |
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Leaf | blades narrowly oblong or narrowly elliptic-oblong to triangular-lanceolate, 15–40 × 2–10 mm, base not articulated, cuneate to subcordate, margins recurved, apex subacute to rounded, midrib with 1 pair of branches. |
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Inflorescences | corymbiform to cylindric, (7–)15–65-flowered, narrowly branched, sometimes with 3–65-flowered dichasia from 1–2 proximal nodes and relatively short, flowering branches from further 1–4 nodes. |
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Flowers | 7–12 mm diam.; sepals persistent, not enclosing capsule, 5, obovate or broadly elliptic to oblong, unequal, 2–4 × 1–1.7 mm; petals 5, bright yellow, oblanceolate, 5–8 mm; stamens (some or all) persistent, 30–50; ovary 3-merous, placentation parietal. |
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Capsules | ovoid-cylindric to broadly ovoid, 4–6 × 3–4 mm. |
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Seeds | not carinate, 0.6 mm; testa reticulate to linear-foveolate. |
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2n | = 18. |
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Hypericum perforatum |
Hypericum cistifolium |
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Phenology | Flowering spring–early fall (Apr–Oct). | |
Habitat | Pine flatwoods, margins of bogs, swamps, and marshes, ditches, on sand, coastal plain | |
Elevation | 0–300 m (0–1000 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; FL; GA; LA; MS; NC; SC; TX
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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.) |
Hypericum cistifolium is woodier in habit than H. sphaerocarpum and has shorter leaves, smaller flowers, narrower sepals, narrower capsules, and smaller seeds. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 6, p. 99. | FNA vol. 6, p. 82. |
Parent taxa | Hypericaceae > Hypericum > sect. Hypericum | Hypericaceae > Hypericum > sect. Myriandra |
Sibling taxa | ||
Subordinate taxa | ||
Synonyms | H. opacum, H. punctulosum, H. rosmarinifolium | |
Name authority | Linnaeus: Sp. Pl. 2: 785. (1753) | Lamarck: in J. Lamarck et al., Encycl. 4: 158. (1797) |
Web links |
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