Hypericum ellipticum |
Hypericum denticulatum |
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millepertuis elliptique, pale Saint John's wort, pale St. John's-wort |
coppery St. John's wort |
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Habit | Herbs, perennial, erect, with creeping, rhizomatous, ± woody base, usually unbranched, sometimes branched proximally, relatively slender, 1.1–3(–5) dm. | Herbs perennial, erect, branching at usually aerenchymatous base and in inflorescence, 2–7 dm. |
Stems | internodes 4-lined. |
internodes 4-lined. |
Leaves | blades broadly to narrowly elliptic or oblanceolate to oblong-elliptic, 11–35 × 3–13 mm, base not articulated, cuneate to shallowly cordate-amplexicaul, margins plane to subrevolute, apex rounded, midrib with 5–7 pairs of branches. |
(main stem) spreading to appressed, sessile; blade usually broadly to narrowly ovate, rarely elliptic or lanceolate, 4–20 × 5–15(–18) mm, mostly shorter than internodes, leathery, margins plane, apex acute to subrounded, densely gland-dotted, basal veins 1–5, if 1, midrib with 2–3 pairs of branches. |
Inflorescences | corymbiform, (1–)3–15-flowered, narrowly branched, sometimes with branches from 1–2 proximal nodes. |
broadly pyramidal to corymbiform, to 25-flowered, branching mostly dichasial. |
Flowers | 12–15 mm diam.; sepals persistent, not enclosing capsule, (4–)5, ± lanceolate to lanceolate-elliptic, ± unequal, 6–7 × 2–3 mm; petals (4–)5, pale yellow, sometimes tinged red, obovate to oblanceolate, 6–8 mm; stamens persistent, 70–95; ovary 3-merous, placentation parietal. |
5–13 mm diam.; sepals ovate or lanceolate to elliptic or obovate, subequal, 3–8 × 1.5–4 mm, margins sometimes ciliate, not setulose-ciliate, apex acute; petals orange-yellow, obovate, 5–10 mm; stamens 50–80, irregularly grouped; styles 2–4 mm; stigmas clavate. |
Capsules | ellipsoid to globose, 4–7 × 3.5–5 mm. |
ovoid to rostrate-subglobose, 3–5 × 2–3 mm. |
Seeds | carinate, 0.6–0.7 mm; testa scalariform-reticulate. |
0.4–0.7 mm; testa obscurely linear-reticulate to finely ribbed-scalariform. |
2n | = 16, 18. |
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Hypericum ellipticum |
Hypericum denticulatum |
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Phenology | Flowering summer (Jun–Sep). | Flowering summer–early fall (Jun–Sep). |
Habitat | Stream, lake, and pond margins, wet meadows, swamps | Wet woods, marshes, bogs |
Elevation | 0–600 m (0–2000 ft) | 0–400 m (0–1300 ft) |
Distribution |
CT; IL; MA; MD; ME; MI; MN; NH; NJ; NY; OH; PA; RI; TN; VT; WA; WI; WV; NB; NF; NS; ON; QC
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AL; DE; GA; NC; NJ; NY; PA; SC; TN; VA
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Discussion | Hypericum ellipticum is related to H. sphaerocarpum, differing by the shorter, herbaceous, rhizomatous habit, shorter leaves, and smaller seeds. A submerged aquatic form (forma submersum Fassett) and one with axillary branches developing after fertilization (forma foliosum Marie-Victorin) seem scarcely worth formal recognition. Hypericum ellipticum is introduced in Washington. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
D. H. Webb (1980) regarded the disjunct populations in North Carolina and Tennessee as possible relicts and the Alabama one as due to recent introduction. J. R. Allison (2011) agreed and, in his opinion, the Pennsylvania and Virginia records are historical, and Hypericum denticulatum is likely adventive in Georgia. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 6, p. 84. | FNA vol. 6, p. 89. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | Brathydium canadense, H. brathydium, H. canadense var. oviforme | H. angulosum, H. denticulatum var. ovalifolium, H. laevigatum, H. virgatum var. ovalifolium |
Name authority | Hooker: Fl. Bor.-Amer. 1: 110. (1831) | Walter: Fl. Carol., 190. (1788) |
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