Contains 30 accepted taxa overall.
Characteristics
Recent work favors including the species of Triadenum within an expanded Hypericum (Meseguer et al. 2013, 2014; Nürk et al. 2013); the species of Triadenum are placed in Hypericum subg. Brathys sect. Elodea (Robson 2016). The three Florida species traditionally included in Triadenum were first described in Hypericum.
Classification
Citation
HYPERICUM Linnaeus, Sp. Pl. 783. 1753.
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TYPE: Hypericum perforatum Linnaeus Lectotypified by Britton & A. Brown, Ill. Fl. N. U.S., ed. 2. 2: 529. 1913.
Species
| Scientific Name | Common Name | Herbarium Specimens | Status | Photos |
|---|---|---|---|---|
| Hypericum adpressum | Bog St. John's-wort, Creeping St. John's-wort | |||
| Hypericum buckleyi | Granite Dome St. John's-wort | |||
| Hypericum canadense | Canada St. John's-wort | |||
| Hypericum cistifolium | Roundpod St. John's Wort | |||
| Hypericum crux-andreae | St. Andrew's Cross, St. Peter's-wort | |||
| Hypericum denticulatum | Coppery St. John's-wort | |||
| Hypericum drummondii | Nits-and-lice, Drummond's St. John's-wort | |||
| Hypericum erythreae | Georgia St. John's-wort, Sparse-leaved St. John’s-wort, Grit St. John’s-wort | |||
| Hypericum fasciculatum | Peelbark St. John's-wort | |||
| Hypericum frondosum | Cedarglade St. Johnswort | |||
| Hypericum galioides | Bedstraw St. Johnswort | |||
| Hypericum gentianoides | Pineweed, Orange-grass | |||
| Hypericum gymnanthum | Clasping-leaf St. John's-wort | |||
| Hypericum harperi | Harper's St. John's-wort | |||
| Hypericum hypericoides | St. Andrew's Cross | |||
| Hypericum lloydii | Lloyd's St. John's-wort | |||
| Hypericum mutilum var. latisepalum | Southern Dwarf St. John's-wort | |||
| Hypericum mutilum var. mutilum | Common Dwarf St. John's-wort | |||
| Hypericum myrtifolium | Myrtle-leaf St. John's-wort | |||
| Hypericum nitidum | Carolina St. Johnswort | |||
| Hypericum nudiflorum | Early St. Johnswort | |||
| Hypericum perforatum | European St. John's-wort | |||
| Hypericum prolificum | Shrubby St-John's-wort | |||
| Hypericum pseudomaculatum | False spotted St. Johnswort | |||
| Hypericum punctatum | Spotted St. John's-wort | |||
| Hypericum setosum | Hairy St. John’s-wort | |||
| Hypericum stragulum | Low St. John’s-wort, Straggling St. John’s-wort | |||
| Hypericum suffruticosum | Pineland St. John's-wort | |||
| Hypericum tenuifolium | Sandhill St. John's-wort | |||
| Hypericum virgatum | Strict St. John’s-wort |
Identification Key
1. Corolla pink, sometimes greenish; stamens 9, in 3 fascicles alternating with staminode fascicles
2
1. Corolla yellow; stamens >9, in 3-5 fascicles or in an continuous or interrupted ring without staminode fascicles
4
2. Petioles conspicuous, 2-15 mm long
2. Petioles absent or inconspicuous, <2 mm long
3
3. Leaf blade with intramarginal gland-dots only
3. Leaf blade with gland-dots on the surface and intramarginally
4. Sepals and petals 4, rarely 5
5
4. Sepals and petals 5, rarely 4
10
5. Styles 2
6
5. Styles 3-4
7
6. Larger leaves >1 cm long, with gland-like auricles at the base; bracteoles near the calyx base; pedicels short, erect at anthesis
6. Larger leaves <1 cm long, without gland-like auricles; bracteoles near the pedicel base; pedicels elongated, reflexed at anthesis
7. Sepals not enclosing the capsule, subequal with the outer ones only slightly larger than the inner ones
7. Sepals enclosing the capsule, unequal with the outer ones much larger than the inner ones
8
8. Outer sepals 9-18 mm wide, conspicuously 5-9-veined
8. Outer sepals 5-10 mm wide, obscurely 3-5-veined
9
9. Leaves subcordate to cordate-clasping
9. Leaves cuneate to truncate at the base
10. Leaves 1-4 mm long
11
10. Larger leaves >5 mm long
12
11. Plant with several, short non-flowering leafy branches
11. Plant lacking short, non-flowering leafy branches
12. Leaves acicular (needle-like), 0.5-1.5 mm wide
13
12. Leaves with an expanded, flat blade, sometimes linear but not acicular, 0.5-25 mm wide
19
13. Largest leaves <12 mm long
14
13. Largest leaves >13 mm long
15
14. Stem internodes sometimes 4-lined at first, soon 2-winged, not terete; leaf surface glossy; capsules 3.5-5.5 mm long; of hydric to mesic habitats
14. Stem internodes 6-lined at first, becoming 4-lined, then terete; leaf surface dull; capsules 6-10 mm long; of xeric habitats
15. Plant <1 m tall, with few branches and a narrow crown
15. Plant >1 m tall with many branches
16
16. Bark smooth and metallic-silvery, exfoliating in thin, curled plates; young stems, leaves, and sepals glaucous
16. Bark not smooth, not metallic-silvery; plant not glaucous
17
17. Bark tight, adherent, not exfoliating or only few narrow strips peeling away
17. Bark flaking in papery sheets or plates or wide strips, corky to spongy
18
18. Plants 2-4 m tall, stems and trunk 2.5-15 cm wide at the base of the plant; stem internodes 4-lined at first, soon 4-angled, then terete; terminal inflorescence 1–3-flowered
18. Plants 1-2 m tall, stems and trunk 0.4-2 cm wide at the base of the plant; stem internodes 6-lined at first, soon 2-winged, then terete; terminal inflorescence (3–)7–32-flowered
19. Stems becoming woody, especially towards the base of the plant
20
19. Stems herbaceous, not woody
26
20. Mid-stem leaves ovate-deltoid, subcordate to cordate, somewhat clasping
20. Mid-stem leaves generally elliptic to linear
21
21. Leaves lacking a definite articulation zone at the base
22
21. Leaves with a definite articulation zone, as a minute, narrow, horizontal line or groove between the leaf base and stem
24
22. Leaves stiff, subcoriaceous, not glaucous, usually with fascicles of leaves in the axils
22. Leaves chartaceous, often glaucous below, lacking leaf fascicles in the axils
23
23. Inflorescences terminal, (1–)3–5(–8)-flowered; sepals tardily deciduous, 1.5–2.3 mm wide; capsules 6–15 × 4.5–8 mm
23. Inflorescences from 1–3 nodes, the terminal 7–45-flowered; sepals deciduous, 1–1.5 mm wide; capsules 3.5–7 × 3–5 mm
24. Inflorescence usually with 1-3 flowers; petals 12-25 mm long
24. Inflorescence usually with 3-25 flowers; petals 5-15 mm long
25
25. Leaf blades 15–32(–37) mm long; flowers 9–14 mm wide; capsules 4.5–6 mm long; seeds 0.7–0.8 mm long
25. Leaf blades 30–70 mm long; flowers 15–30 mm wide; capsules 7–13 mm long; seeds 1.5–2 mm long
26. Leaves linear-subulate; inflorescence racemose
26. Leaves linear to obovate; inflorescence cymose
27
27. Stem and leaves scabrous-tomentose to pilose; sepal margin setulose-ciliate
27. Stems and leaves glabrate; sepal margin not ciliate
28
28. Leaves, sepals, and/or petals with black punctae
29
28. Leaves, sepals, and petals without black punctae
30
29. Petals 6-14 mm long; anther glands amber or pellucid; styles 5-8 mm long
29. Petals 3-6 mm long; anther glands black; styles 1-4 mm long
30. Leaf blades leathery; petals golden yellow or orange-yellow; stamens (35–)50–80
31
30. Leaf blades papery to membranous; petals usually bright, golden, or pale yellow, rarely salmon-orange; stamens 5–25
32
31. Plant unbranched or sparingly branched in the upper nodes; seeds 0.6-0.8 mm long; of dry upland sites
31. Plant with numerous branches at the middle and upper nodes; seeds 0.5-0.6 mm long; of seasonally inundated sites
32. Leaves linear to linear-oblanceolate, 1(3)-nerved
32. Leaves ovate, deltoid-ovate, to elliptic, (3)5-7-nerved
33
33. Upper and mid-stem leaves deltoid-ovate, the apex usually acute
33. Upper and mid-stem leaves ovate-oblong to elliptic, the apex rounded to obtuse
Genus Synonyms
| Synonym | Full Citation | Basionym | Type |
|---|---|---|---|
| No synonyms found. | |||