Hypericum dolabriforme
Hypericum denticulatum
straggling St. John's-wort
coppery St. John's wort
internodes 4-lined at first, then 2-lined to terete.
internodes 4-lined.
blades linear-elliptic or linear-oblong to linear, 20–35 × 3–5 mm (main stem), base not articulated, narrowly cuneate to rounded, margins recurved to revolute, apex obtuse to acute, midrib unbranched.
(main stem) spreading to appressed, sessile;
blade usually broadly to narrowly ovate, rarely elliptic or lanceolate, 4–20 × 5–15(–18) mm, mostly shorter than internodes, leathery, margins plane, apex acute to subrounded, densely gland-dotted, basal veins 1–5, if 1, midrib with 2–3 pairs of branches.
obconic, (1–)3–20-flowered, ± widely branched, sometimes with single flowers at immediately proximal nodes.
broadly pyramidal to corymbiform, to 25-flowered, branching mostly dichasial.
15–20 mm diam.;
sepals persistent, not enclosing capsule, 5, ovate-lanceolate to lanceolate, ± foliaceous, unequal, 5–8(–15) × 2–3(–8)mm;
petals 5, yellow, curved-dolabriform, 10–13 mm;
stamens deciduous, 120–200;
ovary 3-merous.
5–13 mm diam.;
sepals ovate or lanceolate to elliptic or obovate, subequal, 3–8 × 1.5–4 mm, margins sometimes ciliate, not setulose-ciliate, apex acute;
petals orange-yellow, obovate, 5–10 mm;
stamens 50–80, irregularly grouped;
styles 2–4 mm;
stigmas clavate.
ovoid-conic, rostrate, 4–9 × 3–4 mm.
ovoid to rostrate-subglobose, 3–5 × 2–3 mm.
carinate, 1.5–1.8 mm;
testa reticulate-scalariform.
0.4–0.7 mm;
testa obscurely linear-reticulate to finely ribbed-scalariform.
= 18.
Hypericum dolabriforme
Hypericum denticulatum
Hypericum dolabriforme is superficially similar to H. sphaerocarpum, to which W. P. Adams (1962) related it. Apart from the narrow leaves and unequal sepals, it is much nearer morphologically to H. myrtifolium (for example, in the wide-spreading inflorescence, numbers of stamens, and ovoid-conic capsules). Hypericum bissellii, described from a plant growing in Southington, Connecticut, is unlikely to be indigenous in that state.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
D. H. Webb (1980) regarded the disjunct populations in North Carolina and Tennessee as possible relicts and the Alabama one as due to recent introduction. J. R. Allison (2011) agreed and, in his opinion, the Pennsylvania and Virginia records are historical, and Hypericum denticulatum is likely adventive in Georgia.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Go Botany
WildflowerSearch
iNaturalist
USDA Plants Database
