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FNA | Family List | FNA Vol. 6 | Hypericaceae

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.

1 Herbs rarely with rooting base, bushy; leaf blades usually conduplicate; sepals markedly imbricate.   47 Hypericum concinnum
+ Herbs usually with rooting base (except. H. punctatum), not bushy; leaf blades not conduplicate; sepals not or scarcely imbricate.    
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)
+ 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 (2) Stems from rooting, creeping base, internodes weakly 2-lined or not lined, without black glands, rarely with reddish glands; petals sometimes red-tinged.   50 Hypericum scouleri
+ Stems from rooting, not creeping, base, internodes 2- or 4-lined, with black glands in lines; petals not red-tinged   (4)
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).   48 Hypericum maculatum
+ Stems: internodes 2-lined; sepals lanceolate or narrowly oblong to linear, apex acute to aristate; capsules with longitudinal vittae and shorter, oblique vittae.   49 Hypericum perforatum
5 (2) Leaf blade apex usually acute, rarely obtuse to rounded; inflorescence subsidiary branches ascending to widely spreading; anther gland amber or pellucid.   54 Hypericum pseudomaculatum
+ Leaf blade apex usually obtuse, rounded, retuse, or subretuse, rarely acute; inflorescence subsidiary branches narrowly ascending or curved-ascending; anther gland black   (6)
6 (5) Inflorescences (2–)5–14(–22)-flowered; petals 11–18 mm; styles 5.6–12 mm.   51 Hypericum graveolens
+ Inflorescences (5–)13–600-flowered; petals 3–11 mm; styles 1–5 mm   (7)
7 (6) Stems with black glands on or near lines or all over; flowers 15–20 mm diam.; capsules with longitudinal vittae.   52 Hypericum ×mitchellianum
+ Stems with black glands scattered; flowers 8–15 mm diam.; capsules with longitudinal vittae or elongate to ovoid vesicles.   53 Hypericum punctatum


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