Hypericum mutilum |
Hypericum fasciculatum |
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dwarf St. John's-wort, small Canadian St. John's-wort, small flower st john's wort |
peelbark St. Johnswort, sandweed |
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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. | Shrubs, erect, much-branched distally, bushy, not treelike, usually forming mounds, to 15(–30) dm, bark thick, smooth, thin-corky and spongy, exfoliating in thin, papery sheets or plates. | ||||
Stems | internodes 4-angled. |
internodes 6-lined at first, soon 2-winged, then terete, not glaucous. |
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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. |
blades linear-subulate, 8–20 × 0.7–1 mm, not glaucous, base articulated, parallel, margins revolute, apex sometimes slightly broadened, midrib unbranched. |
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Inflorescences | cylindric, 5–60-flowered, branching mostly dichasial; bracts linear-subulate. |
rounded-pyramidal to corymbiform, sometimes intercalary as result of resumed vegetative growth, (3–)7–32-flowered, sometimes with single flowers or 3–5-flowered dichasia from to 3 proximal nodes. |
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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. |
13–16 mm diam.; sepals deciduous, not enclosing capsule, 5, linear-subulate, unequal, (3–)4.5–8(–10) × 0.5 mm, not glaucous; petals 5, bright yellow, obovate-spatulate, 6–9 mm; stamens deciduous, 70–100; ovary 3-merous; styles 2.5–4 mm. |
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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-conic to ovoid-ellipsoid, 5.5 × 2.5–3 mm. |
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Seeds | 0.4–0.7 mm; testa finely linear-scalariform. |
not carinate, 0.4 mm; testa finely foveolate-reticulate. |
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2n | = 18. |
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Hypericum mutilum |
Hypericum fasciculatum |
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Phenology | Flowering spring–fall (Apr–Nov). | |||||
Habitat | Ponds and lake margins, marshes, ditches, coastal plain | |||||
Elevation | 0–500 m (0–1600 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; LA; MS; NC; SC
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Discussion | Subspecies 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
The thick, often spongy, bark, relatively long axillary leaf clusters, paired leaf grooves flanking the midrib abaxially, broader inflorescence, and broader capsules distinguish Hypericum fasciculatum (and H. chapmanii) from H. nitidum and its relatives. Hypericum aspalathoides Willdenow is an illegitimate name for H. fasciculatum. (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. 81. | ||||
Parent taxa | Hypericaceae > Hypericum > sect. Brathys | Hypericaceae > Hypericum > sect. Myriandra | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Sarothra mutila | H. fasciculatum var. aspalathoides, H. fulgidum, H. galioides var. fasciculatum | ||||
Name authority | Linnaeus: Sp. Pl. 2: 787. (1753) | Lamarck: in J. Lamarck et al., Encycl. 4: 160. (1797) | ||||
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