Flora of North America species comparison

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Hypericum maculatum subsp. obtusiusculum

Hypericum sect. Hypericum
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. Herbs, perennial, [subshrubs]; black glands usually on leaves, sepals, and petals and, sometimes, on stems and anthers.
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.

persistent or tardily deciduous, (base not articulated).
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.

6–35 mm diam.;

sepals persistent, 5;

petals persistent, 5;

stamens persistent, 20–109, in 5 fascicles, fascicles connate as 2 + 2 + 1;

ovary 3(–4)-merous;

placentation axile;

styles spreading, bases distinct;

stigmas relatively small.
Capsules

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

Seeds

scarcely carinate, 1 mm;

testa linear-reticulate.

not or slightly carinate.
Species

22 (8, including 1 hybrid, in the flora): North America, Mexico, West Indies, Central America, South America.
2n

= 32.

Hypericum maculatum subsp. obtusiusculum

Hypericum sect. Hypericum
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]
North America; Mexico; Central America; South America; West Indies
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.)

Species 22 (8 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Herbs rarely with rooting base, bushy; leaf blades usually conduplicate; sepals markedly imbricate.
H. concinnum
1. Herbs usually with rooting base (except H. punctatum), not bushy; leaf blades not conduplicate; sepals not or scarcely imbricate.
→ 2
2. Stems with black glands in raised lines or without black glands; leaf blades: tertiary veins not densely reticulate, black glands intramarginal, (± dense to spaced), and laminar, (relatively few and distal or absent); capsules ovoid, broadly ovoid, narrowly ovoid-pyramidal, or oblanceoloid
→ 3
2. Stems with black glands scattered on or near lines or all over; leaf blades: tertiary veins densely reticulate toward margins, black glands intramarginal (dense) and laminar (scattered); capsules ellipsoid, ovoid, broadly ovoid, or subglobose
→ 5
3. Stems from rooting, creeping base, internodes weakly 2-lined or not lined, without black glands, rarely with reddish glands; petals sometimes red-tinged.
H. scouleri
3. Stems from rooting, not creeping, base, internodes 2- or 4-lined, with black glands in lines; petals not red-tinged
→ 4
4. Stems: internodes (at least some) 4-lined; sepals broadly ovate to oblong, apex rounded-apiculate to erose-denticulate; capsules with longitudinal vittae (narrow linear glands).
H. maculatum
4. Stems: internodes 2-lined; sepals lanceolate or narrowly oblong to linear, apex acute to aristate; capsules with longitudinal vittae and shorter, oblique vittae.
H. perforatum
5. Leaf blade apex usually acute, rarely obtuse to rounded; inflorescence subsidiary branches ascending to widely spreading; anther gland amber or pellucid.
H. pseudomaculatum
5. Leaf blade apex usually obtuse, rounded, retuse, or subretuse, rarely acute; inflorescence subsidiary branches narrowly ascending or curved-ascending; anther gland black
→ 6
6. Inflorescences (2–)5–14(–22)-flowered; petals 11–18 mm; styles 5.6–12 mm.
H. graveolens
6. Inflorescences (5–)13–600-flowered; petals 3–11 mm; styles 1–5 mm
→ 7
7. Stems with black glands on or near lines or all over; flowers 15–20 mm diam.; capsules with longitudinal vittae.
H. ×mitchellianum
7. Stems with black glands scattered; flowers 8–15 mm diam.; capsules with longitudinal vittae or elongate to ovoid vesicles.
H. punctatum
Source FNA vol. 6, p. 99. FNA vol. 6, p. 97.
Parent taxa Hypericaceae > Hypericum > sect. Hypericum > Hypericum maculatum Hypericaceae > Hypericum
Subordinate taxa
H. concinnum, H. graveolens, H. maculatum, H. perforatum, H. pseudomaculatum, H. punctatum, H. scouleri, H. ×mitchellianum
Synonyms H. quadrangulum subsp. obtusiusculum H. section Concinna, H. section Graveolentia
Name authority (Tourlet) Hayek: Sched. Fl. Stiriac. 23 – 24: 27. (1912) unknown
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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