Hypericum perforatum |
Hypericum canariense |
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Chase-devil, common St. John's-wort, Klamath weed, millepertuis commun, Tipton's weed |
Canary Island st john's wort, Canary Islands St. John's wort |
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Habit | Shrubs erect, bushy, 10–50 dm. | |
Stems | internodes 4-lined at first, then terete. |
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Leaves | spreading, sessile; blade narrowly elliptic to narrowly elliptic-oblong, 20–70 × 5–15 mm, (proximal usually narrower), base narrowly cuneate to subangustate, margins plane, apex acute to apiculate-obtuse, midrib with 8–12 pairs of branches, tertiary veins densely reticulate toward margins. |
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Inflorescences | broadly rounded-pyramidal to broadly cylindric, to 30-flowered. |
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Flowers | sepals lanceolate, unequal, 3–4.5 × 1–2.2 mm; petals bright yellow, not red-tinged, oblanceolate-unguiculate, 12–17 mm; anther gland yellow to orange; styles widely spreading, 8–14 mm. |
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Capsules | pyramidal-ovoid to ovoid-ellipsoid, 9–12 × 7–8 mm. |
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Seeds | 1.5–2 mm, narrowly winged; testa linear-reticulate to linear-foveolate. |
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2n | = 40. |
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Hypericum perforatum |
Hypericum canariense |
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Phenology | Flowering spring–summer. | |
Habitat | Disturbed sites | |
Elevation | 20–500 m (100–1600 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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CA; Atlantic Islands (Canary Islands, Madeira) [Introduced in North America]
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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 canariense is established at Montecito and Santa Barbara in the hills (P. A. Munz 1974) and along the coast north of Santa Cruz to San Francisco, at locations in Orange and San Mateo counties, and in the San Diego coast region. The description above agrees with that for Hypericum floribundum regarding sepals lanceolate and acute; in typical H. canariense they are oblong-spatulate and rounded. The variation is continuous; only one species is recognized here. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 6, p. 99. | FNA vol. 6, p. 96. |
Parent taxa | Hypericaceae > Hypericum > sect. Hypericum | Hypericaceae > Hypericum > sect. Webbia |
Sibling taxa | ||
Subordinate taxa | ||
Synonyms | H. floribundum, Webbia canariensis, W. floribunda | |
Name authority | Linnaeus: Sp. Pl. 2: 785. (1753) | Linnaeus: Sp. Pl. 2: 784. (1753) |
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