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mountain St. John's wort

cedar glade St. John's-wort, golden St. John's wort

Habit Shrubs, decumbent, spreading and rooting, wiry, branches ascending to erect, forming compact mats, 0.5–4.5 dm. Shrubs, erect, forming rounded bush or treelike, (6–)10–30 dm.
Stems

internodes 4-lined.

internodes 4-lined at first, then 2-lined to terete.

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 usually oblong to lanceolate-oblong, sometimes oblanceolate, 25–65 × 8–22 mm, base articulated, broadly to narrowly cuneate, margins plane or subrecurved, apex apiculate-obtuse to rounded, midrib with 10–16 pairs of branches.

Inflorescences

1(–5)-flowered.

1–3(–7)-flowered from apical node, sometimes with paired single flowers or triads (3-flowered cymules) or 1–3-flowered branches at proximal node.

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.

24–45 mm diam.;

sepals deciduous, not enclosing capsule, (4)5, ovate or oblong to elliptic-spatulate, unequal, 6–14(–20) × 4–10 mm;

petals (4–)5, golden yellow to orange-yellow, obovate to oblanceolate, 12–25 mm;

stamens deciduous, 250–650;

ovary 3-merous.

Capsules

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

ovoid-conic to ovoid-rostrate, 12–15 × 6–8 mm.

Seeds

narrowly to broadly carinate, 1.5–2 mm;

testa finely foveolate-reticulate.

carinate, 1.5 mm;

testa linear-reticulate.

2n

= 18.

Hypericum buckleyi

Hypericum frondosum

Phenology Flowering early–mid summer (Jun–Jul). Flowering summer (Jun–Jul).
Habitat Seepage areas, moist rock crevices, ditches, road embankments Dry cedar-glades and barrens on limestone and calcareous shale
Elevation 900–1600 m (3000–5200 ft) 100–500 m (300–1600 ft)
Distribution
from FNA
GA; NC; SC
[BONAP county map]
from FNA
AL; CT; FL; GA; KY; LA; MA; MS; NC; NY; TN; TX
[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 frondosum is endemic to the southwestern end of the Appalachian Range; it is recorded as introduced in Connecticut, Massachusetts, and New York (W. P. Adams 1962). Records from Arkansas and, possibly, South Carolina and Virginia appear to be errors for H. prolificum. Although H. frondosum is variable over its natural range and approaches H. prolificum morphologically in Arkansas, it remains distinct from its immediate relatives. In cultivation, it sometimes hybridizes with H. prolificum. Artificial hybrids have been made, as well as artificial tetraploids (O. Myers 1963).

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

Source FNA vol. 6, p. 81. FNA vol. 6, p. 76.
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. ellipticum, H. erythreae, H. fasciculatum, 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. amoenum, H. splendens
Name authority M. A. Curtis: Amer. J. Sci. Arts 44: 80. (1843) Michaux: Fl. Bor.-Amer. 2: 81. (1803)
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