Hypericum perforatum |
Hypericum apocynifolium |
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Chase-devil, common St. John's-wort, Klamath weed, millepertuis commun, Tipton's weed |
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Habit | Shrubs, erect, branches ascending, 4–7 dm. | |
Stems | internodes narrowly 4-winged at first, then 2-lined. |
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Leaf | blades oblong to elliptic-oblong, 20–40 × 12–20 mm, base not articulated, broadly cuneate, margins usually plane, rarely recurved, apex rounded to retuse, midrib with 6 pairs of branches. |
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Inflorescences | terminal (1–)3–5(–8)-flowered, narrowly branched. |
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Flowers | 15 mm diam.; sepals tardily deciduous, not enclosing capsule, 5, spatulate to elliptic or ovate, unequal, 3–5 × 1.5–2.3 mm; petals 5, coppery yellow, oblong, 8–10 mm length 2 times sepals; stamens deciduous, 60–80; ovary 3-merous, placentation incompletely axile. |
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Capsules | cylindric-conic, 6–15 × 4.5–8 mm. |
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Seeds | scarcely carinate, 1.8–2 mm; testa finely scalariform-reticulate. |
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Hypericum perforatum |
Hypericum apocynifolium |
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Phenology | Flowering summer (Jun). | |
Habitat | Stream banks and moist woods, coastal plain and inland valleys | |
Elevation | 10–500 m [30–1600 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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AR; FL; LA; OK; TX |
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 apocynifolium has been included in H. nudiflorum; it can be distinguished from the latter by the fewer, larger flowers with relatively longer, persistent sepals, the larger, thicker-walled capsules, and the seeds, which are ridged and straight rather than carinate and curved. A record from Georgia in the Flint River drainage has not been verified. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 6, p. 99. | FNA vol. 6, p. 82. |
Parent taxa | ||
Sibling taxa | ||
Subordinate taxa | ||
Name authority | Linnaeus: Sp. Pl. 2: 785. (1753) | Small: Bull. Torrey Bot. Club 25: 616. (1898) |
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