Hypericum mutilum |
Hypericum drummondii |
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dwarf St. John's-wort, small Canadian St. John's-wort, small flower st john's wort |
Drummond's St. Johnswort, nits and lice |
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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 annual, erect, branches strict, in distal 1/2, 1–8 dm, wiry. | ||||
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. |
erect to suberect, sessile; blade linear or linear-subulate to linear-lanceolate, 5–22 × 0.5–1 mm, subcoriaceous, margins recurved to revolute, apex acute to obtuse, basal vein 1, midrib unbranched. |
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Inflorescences | cylindric, 5–60-flowered, branching mostly dichasial; bracts linear-subulate. |
narrowly to broadly triangular, 1–12-flowered, branching mostly monochasial. |
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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. |
5–8 mm diam.; sepals narrowly oblong to linear-lanceolate, subequal, 3–7 × 0.7–1.3 mm, apex acute; petals golden yellow to orange-yellow, oblong, 4–7 mm; stamens 10–22, separate or obscurely 3-fascicled; styles (0.5–)0.8–1.5 mm; stigmas broadly capitate. |
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Capsules | narrowly ovoid to cylindric-ellipsoid, 2–5 × 1.6–2.4 mm, usually broadest at or near middle. |
narrowly ovoid to ovoid-cylindric, 3.5–7 × 2.5–3 mm, length 1–1.2 times sepals. |
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Seeds | 0.4–0.7 mm; testa finely linear-scalariform. |
0.9–1.1 mm; testa finely scalariform. |
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2n | = 24. |
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Hypericum mutilum |
Hypericum drummondii |
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Phenology | Flowering summer–early fall (Jul–Sep). | |||||
Habitat | Dry, sandy or clay soil in open woods, old fields, waste or rocky places | |||||
Elevation | 0–1100 m (0–3600 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; AR; FL; GA; IA; IL; IN; KS; KY; LA; MO; MS; NC; OH; OK; SC; TN; TX; VA
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Discussion | Subspecies 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Hypericum drummondii is closely related to H. gentianoides. (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. 95. | ||||
Parent taxa | Hypericaceae > Hypericum > sect. Brathys | Hypericaceae > Hypericum > sect. Brathys | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Sarothra mutila | Sarothra drummondii, Brathys drummondii | ||||
Name authority | Linnaeus: Sp. Pl. 2: 787. (1753) | (Greville & Hooker) Torrey & A. Gray: Fl. N. Amer. 1: 165. (1838) | ||||
Web links |
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