Hypericum cistifolium |
Hypericum mutilum |
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roundpod St. Johnswort |
dwarf St. John's-wort, small Canadian St. John's-wort, small flower 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. | Herbs annual or perennial, usually erect, sometimes decumbent and rooting, basal branches sometimes present, usually with to 10 pairs of spreading branches distal to middle, 0.5–8 dm. | ||||
Stems | internodes 4-lined at first, then terete. |
internodes 4-angled. |
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Leaves | 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. |
spreading, sessile or amplexicaul; blade paler abaxially, ovate, elliptic, or elliptic-oblong (proximal), ovate or suborbiculate to elliptic or lanceolate (mid and distal), 3–27(–40) × 1–15 mm, papery to membranous, margins plane, apex obtuse to rounded, basal veins 3–5, midrib with to 3 pairs 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. |
cylindric, 5–60-flowered, branching mostly dichasial; bracts linear-subulate. |
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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. |
3–5 mm diam.; sepals lanceolate to linear-lanceolate or elliptic-oblong to oblanceolate, equal or unequal, 2–4.5 × 0.6–1.5 mm, margins sometimes ciliate, not setulose-ciliate, apex usually acute to apiculate, sometimes obtuse to rounded; petals pale yellow, oblong, 1.7–3.5 mm; stamens 5–16, scarcely grouped; styles 0.5 mm; stigmas broadly capitate. |
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Capsules | ovoid-cylindric to broadly ovoid, 4–6 × 3–4 mm. |
narrowly ovoid to cylindric-ellipsoid, 2–5 × 1.6–2.4 mm, usually broadest at or near middle. |
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Seeds | not carinate, 0.6 mm; testa reticulate to linear-foveolate. |
0.4–0.7 mm; testa finely linear-scalariform. |
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2n | = 18. |
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Hypericum cistifolium |
Hypericum mutilum |
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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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AL; AR; CA; CO; CT; DC; DE; FL; GA; IA; IL; IN; KS; KY; LA; MA; MD; ME; MI; MO; MS; NC; NE; NH; NJ; NY; OH; OK; OR; PA; RI; SC; TN; TX; UT; VA; VT; WA; WI; WV; BC; NB; NS; ON; QC; SK [Introduced in w North America]
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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 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 6, p. 82. | FNA vol. 6, p. 93. | ||||
Parent taxa | Hypericaceae > Hypericum > sect. Myriandra | Hypericaceae > Hypericum > sect. Brathys | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | H. opacum, H. punctulosum, H. rosmarinifolium | Sarothra mutila | ||||
Name authority | Lamarck: in J. Lamarck et al., Encycl. 4: 158. (1797) | Linnaeus: Sp. Pl. 2: 787. (1753) | ||||
Web links |
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