Hypericum dolabriforme
Hypericum lissophloeus
straggling St. John's-wort
smooth-bark St. John's wort
internodes 4-lined at first, then 2-lined to terete.
internodes 4-lined at first, soon 4-angled, then terete, dull silvery, glaucous.
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.
blades linear-subulate to acicular, (9–)12–17 × 0.5–0.8 mm, glaucous, base articulated, parallel or almost so, margins revolute, apex obtuse to rounded, midrib unbranched.
obconic, (1–)3–20-flowered, ± widely branched, sometimes with single flowers at immediately proximal nodes.
narrowly cylindric, 1–3-flowered, usually with paired flowers or triads from to 9 proximal nodes.
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.
20 mm diam.;
sepals deciduous, not enclosing capsule, 5, linear-subulate, subequal, 7–8 × 0.5–0.8 mm, glaucous;
petals 5, bright yellow, obovate-spatulate, 10–12 mm;
stamens deciduous, 170–220;
ovary 3-merous;
styles 5 mm.
ovoid-conic, rostrate, 4–9 × 3–4 mm.
narrowly ovoid to ellipsoid, 6–7 × 2.5–3.5 mm.
carinate, 1.5–1.8 mm;
testa reticulate-scalariform.
narrowly carinate, 1–1.6 mm;
testa coarsely reticulate-sulcate.
= 18.
= 18.
Hypericum dolabriforme
Hypericum lissophloeus
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.)
Of conservation concern.
Hypericum lissophloeus is found in Bay and Washington counties. The larger capsules, one- to three-flowered, lateral inflorescence branches, and smooth-polished, metallic bark (that exfoliates like that of Betula species) are among the features that distinguish H. lissophloeus from H. fasciculatum, H. nitidum, and their allies (H. brachyphyllum and H. chapmanii).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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