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

Habit Herbs perennial, semiaquatic or aquatic, erect, branching with long-creeping rhizomes at aerenchymatous base and from mid and distal nodes, 3–10 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.

Leaves

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.

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

broadly pyramidal to subcorymbiform, 1(–30)-flowered, branching mostly dichasial.

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

Flowers

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.

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

ellipsoid to rostrate-subglobose, 3–4.5 × 2–2.5 mm.

ellipsoid to globose, 4–7 × 3.5–5 mm.

Seeds

0.5–0.6(–0.7) mm;

testa obscurely linear-reticulate to irregularly reticulate.

carinate, 0.6–0.7 mm;

testa scalariform-reticulate.

2n

= 24.

= 16, 18.

Hypericum harperi

Hypericum ellipticum

Phenology Flowering mid–late summer (Jul–Sep). Flowering summer (Jun–Sep).
Habitat Open Taxodium swamps, wet pine barrens Stream, lake, and pond margins, wet meadows, swamps
Elevation 0–200 m (0–700 ft) 0–600 m (0–2000 ft)
Distribution
from FNA
AL; FL; GA; 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
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[BONAP county map]
Discussion

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. 90. FNA vol. 6, p. 84.
Parent taxa Hypericaceae > Hypericum > sect. Brathys Hypericaceae > Hypericum > sect. Myriandra
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. 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 R. Keller: Bot. Jahrb. Syst. 58: 198. (1923) Hooker: Fl. Bor.-Amer. 1: 110. (1831)
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