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1e. HYPERICUM Linnaeus sect. HYPERICUM
[informal sect. group]
Hypericum sect. Concinna N. Robson; Hypericum sect. Graveolentia N. Robson
Herbs, perennial, [subshrubs]; black glands usually on leaves, sepals, and petals and, sometimes, on stems and anthers. Leaves persistent or tardily deciduous, (base not articulated). Flowers 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. Seeds not or slightly carinate.
Species 22 (8 in the flora): North America, Mexico, West Indies, Central America, South America.
SELECTED REFERENCE Culwell, D. E. 1970. A Taxonomic Study of the Section Hypericum in the Eastern United States. Ph.D. dissertation. University of North Carolina.
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| 1 |
Herbs rarely with rooting base, bushy; leaf blades usually conduplicate; sepals markedly imbricate. |
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47 Hypericum concinnum |
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Herbs usually with rooting base (except. H. punctatum), not bushy; leaf blades not conduplicate; sepals not or scarcely imbricate. |
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| 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 |
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(3) |
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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 |
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(5) |
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| 3 (2) |
Stems from rooting, creeping base, internodes weakly 2-lined or not lined, without black glands, rarely with reddish glands; petals sometimes red-tinged. |
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50 Hypericum scouleri |
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Stems from rooting, not creeping, base, internodes 2- or 4-lined, with black glands in lines; petals not red-tinged |
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(4) |
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| 4 (3) |
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). |
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48 Hypericum maculatum |
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Stems: internodes 2-lined; sepals lanceolate or narrowly oblong to linear, apex acute to aristate; capsules with longitudinal vittae and shorter, oblique vittae. |
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49 Hypericum perforatum |
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| 5 (2) |
Leaf blade apex usually acute, rarely obtuse to rounded; inflorescence subsidiary branches ascending to widely spreading; anther gland amber or pellucid. |
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54 Hypericum pseudomaculatum |
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Leaf blade apex usually obtuse, rounded, retuse, or subretuse, rarely acute; inflorescence subsidiary branches narrowly ascending or curved-ascending; anther gland black |
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(6) |
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| 6 (5) |
Inflorescences (2–)5–14(–22)-flowered; petals 11–18 mm; styles 5.6–12 mm. |
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51 Hypericum graveolens |
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Inflorescences (5–)13–600-flowered; petals 3–11 mm; styles 1–5 mm |
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(7) |
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| 7 (6) |
Stems with black glands on or near lines or all over; flowers 15–20 mm diam.; capsules with longitudinal vittae. |
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52 Hypericum ×mitchellianum |
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Stems with black glands scattered; flowers 8–15 mm diam.; capsules with longitudinal vittae or elongate to ovoid vesicles. |
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53 Hypericum punctatum |
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