Hypericum perforatum |
Hypericum concinnum |
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Chase-devil, common St. John's-wort, Klamath weed, millepertuis commun, Tipton's weed |
gold-wire |
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Habit | Herbs erect or ascending, rarely with rooting base, bushy, 1.5–3.3 dm. | |
Stems | internodes (at least some) 4-lined, without black glands. |
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Leaves | spreading, sessile or petiolate (to 0.5 mm); blade narrowly elliptic or narrowly oblong to linear, usually conduplicate, sometimes falcate, 13–22 × 1.5–8 mm, base cuneate, margins plane, apex acute to subacute, midrib with 2–4 pairs of branches, black glands marginal. |
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Inflorescences | subcapitate to cylindric, 1–7-flowered. |
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Flowers | 20–35 mm diam.; sepals markedly imbricate, spreading in fruit, broadly to narrowly ovate, unequal, 6–9 × 2–3 mm, apex acute to acuminate; petals yellow, obovate or oblong-obovate, (10–)12–15 mm; stamens 40–80(–100); anther gland amber; styles 6–9 mm. |
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Capsules | ovoid, 6–9 × 4–4.5 mm, with longitudinal vittae. |
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Seeds | not carinate, 1 mm; testa minutely and shallowly pitted. |
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2n | = 16. |
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Hypericum perforatum |
Hypericum concinnum |
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Phenology | Flowering summer (May–Jul). | |
Habitat | Dry slopes, chaparral, yellow pine forest | |
Elevation | 100–600(–900) m [300–2000(–3000) 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
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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 concinnum is known from the Sierra Nevada from Mariposa County to Shasta County and the North Coast Ranges from Marin County to Mendocino County. It is isolated, taxonomically and geographically, from its nearest relative, which seems to be the northeastern Asian H. ascyron subsp. gebleri (Ledebour) N. Robson. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 6, p. 99. | FNA vol. 6, p. 98. |
Parent taxa | ||
Sibling taxa | ||
Subordinate taxa | ||
Synonyms | H. seleri | |
Name authority | Linnaeus: Sp. Pl. 2: 785. (1753) | Bentham: Pl. Hartw., 300. (1849) |
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