Hypericum ascyron subsp. pyramidatum
millepertuis à grandes fleurs
internodes 4-lined at first, then 4-angled.
spreading, sessile, amplexicaul;
blade ovate-lanceolate to lanceolate or oblong, 40–85 × 18–37 mm on main stem, smaller distally and on branches, base rounded to cordate, margins plane, apex usually acute to apiculate, sometimes obtuse, midrib with 4–7 pairs of branches, tertiary veins densely reticulate toward margins.
cylindric to narrowly pyramidal, 1–35-flowered.
sepals ovate to lanceolate or oblong-elliptic, subequal or equal, 8–13 × 4–8 mm, apex acute to acuminate;
petals golden yellow, sometimes red-tinged, narrowly obovate to oblanceolate-falcate, 25–40 mm;
styles (4–)5, 3–7 mm.
ovoid, 12–20(–30) × 10–13 mm.
1.5 mm, narrowly winged;
testa shallowly linear-reticulate.
Hypericum ascyron subsp. pyramidatum
The American populations of Hypericum ascyron sometimes have been treated as distinct from those of eastern Asia, usually as H. pyramidatum. These populations can be distinguished by the combination of relatively broad leaves, acute sepals, and, usually, almost distinct styles; they are better treated as subsp. pyramidatum (see N. K. B. Robson 2001). The scattered American distribution of Hypericum ascyron, which seems to coincide well with earlier Native American campsites, led W. G. Dore (in herbarium notes) to suggest that it was distributed by aborigines for an as yet unknown reason (see J. M. Gillett and N. K. B. Robson 1981).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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