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mountain St. John's wort

millepertuis elliptique, pale Saint John's wort, pale St. John's-wort

Habit Shrubs, decumbent, spreading and rooting, wiry, branches ascending to erect, forming compact mats, 0.5–4.5 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.

Leaf

blades oblong or elliptic to obovate, 4–25 × 2–12 mm, base not articulated, cuneate, margins plane, apex rounded, midrib with 2–4 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

1(–5)-flowered.

corymbiform, (1–)3–15-flowered, narrowly branched, sometimes with branches from 1–2 proximal nodes.

Flowers

20–25 mm diam.;

sepals persistent, not enclosing capsule, 5, broadly elliptic to elliptic-spatulate or obovate, subequal, 4–5 × 2.5–3 mm;

petals 5, golden yellow, oblanceolate, 6–10.5 mm;

stamens persistent, 100;

ovary 3-merous.

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

ovoid to ovoid-cylindric, 8–12 × 5 mm.

ellipsoid to globose, 4–7 × 3.5–5 mm.

Seeds

narrowly to broadly carinate, 1.5–2 mm;

testa finely foveolate-reticulate.

carinate, 0.6–0.7 mm;

testa scalariform-reticulate.

2n

= 16, 18.

Hypericum buckleyi

Hypericum ellipticum

Phenology Flowering early–mid summer (Jun–Jul). Flowering summer (Jun–Sep).
Habitat Seepage areas, moist rock crevices, ditches, road embankments Stream, lake, and pond margins, wet meadows, swamps
Elevation 900–1600 m (3000–5200 ft) 0–600 m (0–2000 ft)
Distribution
from FNA
GA; NC; SC
[BONAP county map]
from FNA
CT; IL; MA; MD; ME; MI; MN; NH; NJ; NY; OH; PA; RI; TN; VT; WA; WI; WV; NB; NF; NS; ON; QC
[WildflowerSearch map]
[BONAP county map]
Discussion

Hypericum buckleyi is found throughout the southern Appalachian Mountains.

The decumbent habit and persistent sepals and stamens distinguish Hypericum buckleyi from its nearest relative, H. prolificum.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

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.)

Source FNA vol. 6, p. 81. FNA vol. 6, p. 84.
Parent taxa Hypericaceae > Hypericum > sect. Myriandra Hypericaceae > Hypericum > sect. Myriandra
Sibling taxa
H. adpressum, H. anagalloides, H. apocynifolium, H. ascyron, H. boreale, H. brachyphyllum, 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. radfordiorum, 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. denticulatum, H. dolabriforme, H. drummondii, H. edisonianum, 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 Brathydium canadense, H. brathydium, H. canadense var. oviforme
Name authority M. A. Curtis: Amer. J. Sci. Arts 44: 80. (1843) Hooker: Fl. Bor.-Amer. 1: 110. (1831)
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