Hypericum perforatum |
Hypericum galioides |
|
---|---|---|
Chase-devil, common St. John's-wort, Klamath weed, millepertuis commun, Tipton's weed |
bedstraw St. Johnswort |
|
Habit | Shrubs, erect, forming rounded clumps, 5–15 dm. | |
Stems | internodes 6-lined at first, soon 4-lined, then terete. |
|
Leaf | blades narrowly oblong-elliptic or oblanceolate to linear, 15–32(–37) × 1–7 mm, base articulated, attenuate, margins recurved to revolute, apex rounded to acute, midrib obscurely branched. |
|
Inflorescences | narrowly cylindric, 3–15-flowered from apical node, with (1–)3–5-flowered dichasia from 3–4 proximal nodes, sometimes with additional flowering branches. |
|
Flowers | 9–14 mm diam.; sepals deciduous, not enclosing capsule, 5, oblanceolate-spatulate to linear, subequal or equal, 3.5–6.5 × 0.5–1.5 mm; petals 5, bright yellow, obovate-oblanceolate, 5–9 mm; stamens deciduous, 60–120; ovary 3-merous, placentation parietal. |
|
Capsules | narrowly ovoid-conic, 4.5–6 × 2.5–3.5 mm. |
|
Seeds | narrowly carinate, 0.7–0.8 mm; testa finely reticulate. |
|
2n | = 18. |
|
Hypericum perforatum |
Hypericum galioides |
|
Phenology | Flowering summer (Jun–Aug). | |
Habitat | Wet or moist, open habitats (stream banks, flood plains, roadside ditches, low pine forest, etc.), coastal plain | |
Elevation | 0–200 m [0–700 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]
|
AL; FL; GA; LA; MS; NC; SC; 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.) |
The leaves of Hypericum galioides vary considerably in width; the lamina is always visible on either side of the midrib. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 6, p. 99. | FNA vol. 6, p. 78. |
Parent taxa | ||
Sibling taxa | ||
Subordinate taxa | ||
Synonyms | Brathydium ambiguum, H. ambiguum, H. axillare, H. galioides var. ambiguum, H. galioides var. axillare, H. michauxii, Myriandra galioides, M. michauxii | |
Name authority | Linnaeus: Sp. Pl. 2: 785. (1753) | Lamarck: in J. Lamarck et al., Encycl. 4: 161. (1797) |
Web links |
|