Hypericum mutilum |
Hypericum harperi |
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dwarf St. John's-wort, small Canadian St. John's-wort, small flower st john's wort |
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Habit | 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. | Herbs perennial, semiaquatic or aquatic, erect, branching with long-creeping rhizomes at aerenchymatous base and from mid and distal nodes, 3–10 dm. | ||||
Stems | internodes 4-angled. |
internodes 4-lined. |
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Leaves | 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. |
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. |
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Inflorescences | cylindric, 5–60-flowered, branching mostly dichasial; bracts linear-subulate. |
broadly pyramidal to subcorymbiform, 1(–30)-flowered, branching mostly dichasial. |
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Flowers | 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. |
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. |
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Capsules | narrowly ovoid to cylindric-ellipsoid, 2–5 × 1.6–2.4 mm, usually broadest at or near middle. |
ellipsoid to rostrate-subglobose, 3–4.5 × 2–2.5 mm. |
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Seeds | 0.4–0.7 mm; testa finely linear-scalariform. |
0.5–0.6(–0.7) mm; testa obscurely linear-reticulate to irregularly reticulate. |
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2n | = 24. |
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Hypericum mutilum |
Hypericum harperi |
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Phenology | Flowering mid–late summer (Jul–Sep). | |||||
Habitat | Open Taxodium swamps, wet pine barrens | |||||
Elevation | 0–200 m (0–700 ft) | |||||
Distribution |
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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AL; FL; GA; SC |
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Discussion | 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. 93. | FNA vol. 6, p. 90. | ||||
Parent taxa | Hypericaceae > Hypericum > sect. Brathys | Hypericaceae > Hypericum > sect. Brathys | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Sarothra mutila | |||||
Name authority | Linnaeus: Sp. Pl. 2: 787. (1753) | R. Keller: Bot. Jahrb. Syst. 58: 198. (1923) | ||||
Web links |
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