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brushy mountain St. Johnswort

coppery St. John's wort

Habit Herbs perennial, erect or ± spreading, branching at base and beyond, (3–)4–7(–7.8) dm. Herbs perennial, erect, branching at usually aerenchymatous base and in inflorescence, 2–7 dm.
Stems

internodes 4-lined.

internodes 4-lined.

Leaves

ascending to widely spreading, sessile;

blade narrowly lanceolate (linear-lanceolate on axillary branches), 10–40(–55) × 5–10(–13) mm, longer than internodes, leathery, margins plane, apex acute to acuminate, densely gland-dotted, basal vein 1, midrib with inconspicuous 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

cylindric, to 40-flowered; branching mostly dichasial, subsidiary branches usually with relatively smaller leaves.

broadly pyramidal to corymbiform, to 25-flowered, branching mostly dichasial.

Flowers

8–15+ mm diam.;

sepals lanceolate, unequal (outer slightly wider than inner), 3–6(–7.5) × 1.1–1.8(–2.2) mm, margins sometimes ciliate, not setulose-ciliate, apex acute or acuminate;

petals orange-yellow, obovate, 5–10 mm;

stamens 50–80, filaments basally connate;

styles 2–4 mm;

stigmas capitate.

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

ovoid, 5 × 3–4 mm.

ovoid to rostrate-subglobose, 3–5 × 2–3 mm.

Seeds

0.4–0.8 mm;

testa linear-pitted.

0.4–0.7 mm;

testa obscurely linear-reticulate to finely ribbed-scalariform.

2n

= 24.

Hypericum radfordiorum

Hypericum denticulatum

Phenology Flowering late spring–fall (May–)Jun–Sep(–Oct). Flowering summer–early fall (Jun–Sep).
Habitat Granitic outcrops Wet woods, marshes, bogs
Elevation 500–800 m (1600–2600 ft) 0–400 m (0–1300 ft)
Distribution
from FNA
NC
[BONAP county map]
from FNA
AL; DE; GA; NC; NJ; NY; PA; SC; TN; VA
[WildflowerSearch map]
[BONAP county map]
Discussion

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. 90. FNA vol. 6, p. 89.
Parent taxa Hypericaceae > Hypericum > sect. Brathys Hypericaceae > Hypericum > sect. Brathys
Sibling taxa
H. adpressum, H. anagalloides, H. apocynifolium, H. ascyron, H. boreale, H. brachyphyllum, H. buckleyi, H. canadense, H. canariense, H. chapmanii, H. cistifolium, H. concinnum, H. crux-andreae, H. cumulicola, H. densiflorum, H. denticulatum, H. dolabriforme, H. drummondii, H. edisonianum, H. ellipticum, H. erythreae, H. fasciculatum, H. frondosum, H. galioides, H. gentianoides, H. graveolens, H. gymnanthum, H. harperi, H. hypericoides, H. kalmianum, H. lissophloeus, H. lloydii, H. lobocarpum, H. maculatum, H. majus, H. microsepalum, H. mutilum, H. myrtifolium, H. nitidum, H. nudiflorum, H. paucifolium, H. perforatum, H. prolificum, H. pseudomaculatum, H. punctatum, H. scouleri, H. setosum, H. sphaerocarpum, H. suffruticosum, H. tenuifolium, H. tetrapetalum, H. virgatum, H. ×mitchellianum
H. adpressum, H. anagalloides, H. apocynifolium, H. ascyron, H. boreale, H. brachyphyllum, H. buckleyi, H. canadense, H. canariense, H. chapmanii, H. cistifolium, H. concinnum, H. crux-andreae, H. cumulicola, H. densiflorum, H. dolabriforme, H. drummondii, H. edisonianum, H. ellipticum, H. erythreae, H. fasciculatum, H. frondosum, H. galioides, H. gentianoides, H. graveolens, H. gymnanthum, H. harperi, H. hypericoides, H. kalmianum, H. lissophloeus, H. lloydii, H. lobocarpum, H. maculatum, H. majus, H. microsepalum, H. mutilum, H. myrtifolium, H. nitidum, H. nudiflorum, H. paucifolium, H. perforatum, H. prolificum, H. pseudomaculatum, H. punctatum, H. radfordiorum, H. scouleri, H. setosum, H. sphaerocarpum, H. suffruticosum, H. tenuifolium, H. tetrapetalum, H. virgatum, H. ×mitchellianum
Synonyms H. angulosum, H. denticulatum var. ovalifolium, H. laevigatum, H. virgatum var. ovalifolium
Name authority Weakley ex J. R. Allison: Castanea 76: 110, fig. 3. (2011) Walter: Fl. Carol., 190. (1788)
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