Hypericum adpressum
Hypericum frondosum
creeping St. John's-wort
cedar glade St. John's-wort, golden St. John's wort
internodes 4-lined at first, then 2-lined to terete.
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.
rounded-corymbiform, 13–60-flowered, narrowly branched, without subsidiary branches.
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.
10–15 mm diam.;
sepals persistent, not enclosing capsule, 5, ovate-lanceolate to lanceolate, subequal, (2–)4–7 × 1–1.5 mm;
petals 5, bright yellow, obovate-oblanceolate, 6–8 mm;
stamens persistent, 60–80;
ovary 3-merous, placentation parietal.
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.
ellipsoid to ovoid-ellipsoid, 3.5–6 × 2–4 mm.
ovoid-conic to ovoid-rostrate, 12–15 × 6–8 mm.
slightly carinate, 0.6–0.7 mm;
testa scalariform.
carinate, 1.5 mm;
testa linear-reticulate.
= 18.
= 18.
Hypericum adpressum
Hypericum frondosum
Hypericum adpressum is more herbaceous and rhizomatous than H. sphaerocarpum and has narrower capsules and smaller seeds.
The plants with aerenchymatous tissue in the rhizome (var. spongiosum) are not taxonomically distinct but merely the result of a habitat-induced modification.
(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.)
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