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mountain St. John's wort

sharpleaf St. Johnswort

Habit Shrubs, decumbent, spreading and rooting, wiry, branches ascending to erect, forming compact mats, 0.5–4.5 dm. Herbs perennial, erect, unbranched or branching at base and in inflorescence, 4–7.5(–10) dm.
Stems

internodes 4-lined.

internodes 4-lined.

Leaves

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.

(main stem) ascending to spreading, sessile;

blade lanceolate to oblong-elliptic or obovate, 10–30(–50) × 3–8(–12) mm, on main stem, longer than internodes, leathery, margins plane, apex usually acute to acuminate, rarely obtuse, basal veins 1–3+, midrib with 2–3 pairs of inconspicuous branches.

Inflorescences

1(–5)-flowered.

broadly cylindric to corymbiform, 25–70-flowered, branching mostly dichasial, subsidiary branches with or without relatively smaller leaves.

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.

8–13 mm diam.;

sepals narrowly ovate to lanceolate, equal, 3–3.5 × 1.5–2.5 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.

Capsules

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

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

Seeds

narrowly to broadly carinate, 1.5–2 mm;

testa finely foveolate-reticulate.

(0.5–)0.6–0.8(–0.9) mm;

testa reticulate.

2n

= 24.

Hypericum buckleyi

Hypericum virgatum

Phenology Flowering early–mid summer (Jun–Jul). Flowering mid–late summer (Jun–Sep).
Habitat Seepage areas, moist rock crevices, ditches, road embankments Dry roadsides, fields, open woods
Elevation 900–1600 m (3000–5200 ft) 0–700 m (0–2300 ft)
Distribution
from FNA
GA; NC; SC
[BONAP county map]
from FNA
AL; AR; FL; GA; IL; IN; KY; LA; MD; MS; NC; OH; SC; TN; VA; WV
[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.)

Source FNA vol. 6, p. 81. FNA vol. 6, p. 90.
Parent taxa Hypericaceae > Hypericum > sect. Myriandra Hypericaceae > Hypericum > sect. Brathys
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. 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. ×mitchellianum
Synonyms Brathys lanceolata, H. acutifolium, H. denticulatum subsp. acutifolium, H. denticulatum var. acutifolium, H. denticulatum var. recognitum, H. virgatum var. acutifolium
Name authority M. A. Curtis: Amer. J. Sci. Arts 44: 80. (1843) Lamarck: in J. Lamarck et al., Encycl. 4: 158. (1796)
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