Flora of North America species comparison

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Hypericum maculatum subsp. obtusiusculum
Photo is of parent taxon

dotted john's-wort, imperforate St. John's-wort, spotted St. John's-wort
Habit Herbs erect, with rooting, not creeping, base, forming clumps, 1.5–10 dm.
Stems

internodes (at least some) 4-lined, with black glands in raised lines.
Leaves

spreading, sessile;

blade ovate, ovate-lanceolate, oblong, or elliptic, 15–50 × 10–20 mm, base cuneate to rounded, margins plane, apex rounded, midrib with 2–3 pairs of branches, tertiary veins not densely reticulate, black glands intramarginal (spaced), pale glands usually sparse or absent.
Inflorescences

subcorymbiform to broadly pyramidal or cylindric, to 40-flowered.
Flowers

15–25(–30) mm diam.;

sepals not imbricate, spreading in fruit, broadly ovate to oblong, unequal to subequal, 4–5 × 2–3.5 mm, apex rounded-apiculate to erose-denticulate;

petals golden yellow, obovate-oblong to oblanceolate, 10–15 mm;

stamens 30–70;

anther gland black;

styles 3–4 mm.
Capsules

broadly ovoid, 7–9 × 5–7 mm, with longitudinal vittae.
Seeds

scarcely carinate, 1 mm;

testa linear-reticulate.
2n

= 32.

Hypericum maculatum subsp. obtusiusculum
Phenology Flowering summer.
Habitat Waste places, open sites, dry or damp
Elevation 0–2500 m (0–8200 ft)
Distribution
from FNA
ID; WA; BC; Europe [Introduced in North America]
[BONAP county map]
Discussion

The western European lowland subspecies of Hypericum maculatum has been recorded from disturbed habitats near Vancouver and Prince Rupert regions in western British Columbia for more than 50 years. There is no evidence as to whether it has persisted over the whole of this period or has been reintroduced. The mainly eastern European and Siberian subsp. maculatum is diploid (2n = 16) and has entire sepals, dotted to shortly streaked (not lined) petals, and a narrower angle of branching (ca. 30° rather than ca. 50°).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 6, p. 99.
Parent taxa Hypericaceae > Hypericum > sect. Hypericum > Hypericum maculatum
Synonyms H. quadrangulum subsp. obtusiusculum
Name authority (Tourlet) Hayek: Sched. Fl. Stiriac. 23 – 24: 27. (1912)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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