Hypericum perforatum |
Hypericum lloydii |
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Chase-devil, common St. John's-wort, Klamath weed, millepertuis commun, Tipton's weed |
sandhill St. Johnswort |
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Habit | Shrubs, decumbent, straggling and rooting, forming low, rounded clumps or mats, 1–5 dm. | |
Stems | internodes (4-) or 6-lined at first, then terete. |
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Leaf | blades linear-subulate, 13–25 × 0.5–0.8 mm, base articulated, parallel, margins revolute, apex rounded to retuse, midrib unbranched. |
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Inflorescences | narrowly pyramidal, 1–3-flowered, with 1–3(–5)-flowered dichasia from to 5 proximal nodes, without additional flowering branches; pedicels 0.5 mm. |
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Flowers | 12–14 mm diam.; sepals deciduous, not enclosing capsule, 5, linear-subulate, unequal, (3–)4.5–7 × 0.5–0.8 mm; petals 5, golden yellow, oblanceolate-oblong, 5–7.5 mm; stamens deciduous, 100; ovary 3-merous. |
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Capsules | ovoid, 3–4 × 2–2.5 mm. |
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Seeds | carinate, 0.7 mm; testa not seen. |
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Hypericum perforatum |
Hypericum lloydii |
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Phenology | Flowering summer (Aug). | |
Habitat | Dry habitats (pine woods, granite outcrops, roadside embankments), inner coastal plain and foothills | |
Elevation | 100–300 m (300–1000 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; GA; NC; SC
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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.) |
The habit, leaf shape, and drier habitats distinguish Hypericum lloydii from H. galioides. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 6, p. 99. | FNA vol. 6, p. 79. |
Parent taxa | Hypericaceae > Hypericum > sect. Hypericum | Hypericaceae > Hypericum > sect. Myriandra |
Sibling taxa | ||
Subordinate taxa | ||
Synonyms | H. galioides var. lloydii | |
Name authority | Linnaeus: Sp. Pl. 2: 785. (1753) | (Svenson) W. P. Adams: Contr. Gray Herb. 189: 32. (1962) |
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