Hypericum harperi |
Hypericum ellipticum |
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millepertuis elliptique, pale Saint John's wort, pale St. John's-wort |
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Habit | Herbs perennial, semiaquatic or aquatic, erect, branching with long-creeping rhizomes at aerenchymatous base and from mid and distal nodes, 3–10 dm. | Herbs, perennial, erect, with creeping, rhizomatous, ± woody base, usually unbranched, sometimes branched proximally, relatively slender, 1.1–3(–5) dm. |
Stems | internodes 4-lined. |
internodes 4-lined. |
Leaves | ascending to deflexed, sessile; blade narrowly oblong-elliptic (proximal) or lanceolate to linear-lanceolate, 10–30 × 3–8 mm, mostly longer than internodes, not or scarcely smaller distally, leathery, margins plane, apex acute, basal or near-basal veins 1–3(–5), midrib with 0–2 pairs of branches. |
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. |
Inflorescences | broadly pyramidal to subcorymbiform, 1(–30)-flowered, branching mostly dichasial. |
corymbiform, (1–)3–15-flowered, narrowly branched, sometimes with branches from 1–2 proximal nodes. |
Flowers | 4–10 mm diam.; sepals lanceolate, usually unequal, 3–5 × 0.8–1 mm, margins sometimes ciliate, not setulose-ciliate, apex acute to acuminate; petals orange-yellow, obovate, 6–10 mm; stamens 50–80, irregularly grouped; styles 2–4 mm; stigmas capitate. |
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. |
Capsules | ellipsoid to rostrate-subglobose, 3–4.5 × 2–2.5 mm. |
ellipsoid to globose, 4–7 × 3.5–5 mm. |
Seeds | 0.5–0.6(–0.7) mm; testa obscurely linear-reticulate to irregularly reticulate. |
carinate, 0.6–0.7 mm; testa scalariform-reticulate. |
2n | = 24. |
= 16, 18. |
Hypericum harperi |
Hypericum ellipticum |
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Phenology | Flowering mid–late summer (Jul–Sep). | Flowering summer (Jun–Sep). |
Habitat | Open Taxodium swamps, wet pine barrens | Stream, lake, and pond margins, wet meadows, swamps |
Elevation | 0–200 m (0–700 ft) | 0–600 m (0–2000 ft) |
Distribution |
AL; FL; GA; SC |
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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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.) |
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Source | FNA vol. 6, p. 90. | FNA vol. 6, p. 84. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | Brathydium canadense, H. brathydium, H. canadense var. oviforme | |
Name authority | R. Keller: Bot. Jahrb. Syst. 58: 198. (1923) | Hooker: Fl. Bor.-Amer. 1: 110. (1831) |
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