Hypericum cistifolium |
Hypericum ascyron |
|
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roundpod St. Johnswort |
great or giant St. John's wort, great St. John's-wort |
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Habit | Shrubs, erect, unbranched or with relatively short branches and sometimes 1–2 branches ascending from proximal nodes, 5–13 dm. | |
Stems | internodes 4-lined at first, then terete. |
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Leaf | blades narrowly oblong or narrowly elliptic-oblong to triangular-lanceolate, 15–40 × 2–10 mm, base not articulated, cuneate to subcordate, margins recurved, apex subacute to rounded, midrib with 1 pair of branches. |
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Inflorescences | corymbiform to cylindric, (7–)15–65-flowered, narrowly branched, sometimes with 3–65-flowered dichasia from 1–2 proximal nodes and relatively short, flowering branches from further 1–4 nodes. |
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Flowers | 7–12 mm diam.; sepals persistent, not enclosing capsule, 5, obovate or broadly elliptic to oblong, unequal, 2–4 × 1–1.7 mm; petals 5, bright yellow, oblanceolate, 5–8 mm; stamens (some or all) persistent, 30–50; ovary 3-merous, placentation parietal. |
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Capsules | ovoid-cylindric to broadly ovoid, 4–6 × 3–4 mm. |
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Seeds | not carinate, 0.6 mm; testa reticulate to linear-foveolate. |
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2n | = 18. |
|
Hypericum cistifolium |
Hypericum ascyron |
|
Phenology | Flowering spring–early fall (Apr–Oct). | |
Habitat | Pine flatwoods, margins of bogs, swamps, and marshes, ditches, on sand, coastal plain | |
Elevation | 0–300 m (0–1000 ft) | |
Distribution |
AL; FL; GA; LA; MS; NC; SC; TX
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CT; IA; IL; IN; KS; MA; MD; MI; MN; MO; NY; OH; PA; VT; WI; ON; QC; Asia (e China, Japan, Korea, Siberia)
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Discussion | Hypericum cistifolium is woodier in habit than H. sphaerocarpum and has shorter leaves, smaller flowers, narrower sepals, narrower capsules, and smaller seeds. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Subspecies 3 (1 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 6, p. 82. | FNA vol. 6, p. 97. |
Parent taxa | Hypericaceae > Hypericum > sect. Myriandra | Hypericaceae > Hypericum > sect. Roscyna |
Sibling taxa | ||
Subordinate taxa | ||
Synonyms | H. opacum, H. punctulosum, H. rosmarinifolium | |
Name authority | Lamarck: in J. Lamarck et al., Encycl. 4: 158. (1797) | Linnaeus: Sp. Pl. 2: 783. (1753) |
Web links |