Hypericum

Contains 34 accepted taxa overall.

Characteristics
Hypericum L.
CLUSIACEAE
ST.JOHN'S-WORT
Classification
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MALPIGHIALES
Hypericum
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 Status Photos
Hypericum apocynifolium EARLY ST.JOHN'S-WORT Native
Hypericum brachyphyllum COASTALPLAIN ST.JOHN'S-WORT Native FACW (NWPL) FACW (DEP)
Hypericum canadense LESSER CANADIAN ST.JOHN'S-WORT Native FACW (NWPL) FACW (DEP)
Hypericum chapmanii APALACHICOLA ST.JOHN'S-WORT Native Endemic OBL (NWPL) OBL (DEP)
Hypericum cistifolium ROUNDPOD ST.JOHN'S-WORT Native FACW (NWPL) FACW (DEP)
Hypericum crux-andreae ST.PETER'S-WORT Native FACW (NWPL) FACW (DEP)
Hypericum cumulicola HIGHLANDS SCRUB ST.JOHN'S-WORT; HIGHLANDS SCRUB HYPERICUM Native Endemic Endangered-State Endangered-US
Hypericum denticulatum COPPERY ST.JOHN'S-WORT Native FACW (NWPL) FACW (DEP)
Hypericum drummondii NITS-AND-LICE; DRUMMOND'S ST.JOHN'S-WORT Native FACU (NWPL)
Hypericum edisonianum ARCADIAN ST.JOHN'S-WORT; EDISON'S ST.JOHN'S-WORT; EDISON ASCYRUM Native Endemic Endangered-State OBL (NWPL) OBL (DEP)
Hypericum exile FLORIDA SANDS ST.JOHN'S-WORT Native Endemic FACW (NWPL) FACW (DEP)
Hypericum fasciculatum SANDWEED; PEELBARK ST.JOHN'S-WORT Native FACW (NWPL) OD (WAP) OBL (DEP)
Hypericum frondosum CEDARGLADE ST.JOHN'S-WORT Native FACW (DEP)
Hypericum galioides BEDSTRAW ST.JOHN'S-WORT Native OBL (NWPL) FACW (DEP)
Hypericum gentianoides PINEWEEDS; ORANGEGRASS Native FACU (NWPL)
Hypericum gymnanthum CLASPINGLEAF ST.JOHN'S-WORT Native FACW (NWPL) FACW (DEP)
Hypericum harperi HARPER'S ST.JOHN'S-WORT Native FACW (DEP)
Hypericum hypericoides ST.ANDREW'S-CROSS Native FAC (NWPL) FAC (DEP)
Hypericum lissophloeus SMOOTHBARK ST.JOHN'S-WORT Native Endemic Endangered-State OBL (NWPL) OBL (DEP)
Hypericum microsepalum FLATWOODS ST.JOHN'S-WORT Native FAC (NWPL)
Hypericum mutilum DWARF ST.JOHN'S-WORT Native FACW (NWPL) T (WAP) FACW (DEP)
Hypericum myrtifolium MYRTLELEAF ST.JOHN'S-WORT Native FACW (NWPL) T (WAP) FACW (DEP)
Hypericum nitidum CAROLINA ST.JOHN'S-WORT Native OBL (NWPL) OBL (DEP)
Hypericum nudiflorum EARLY ST.JOHN'S-WORT Native FACW (NWPL) FACW (DEP)
Hypericum prolificum SHRUBBY ST.JOHN'S-WORT Native FAC (NWPL)
Hypericum pseudomaculatum FALSE SPOTTED ST.JOHN'S-WORT Native
Hypericum punctatum SPOTTED ST.JOHN'S-WORT Native FAC (NWPL)
Hypericum setosum HAIRY ST.JOHN'S-WORT Native FACW (NWPL) FACW (DEP)
Hypericum suffruticosum PINELAND ST.JOHN'S-WORT Native FACW (DEP)
Hypericum tenuifolium ATLANTIC ST.JOHN'S-WORT Native FACU (NWPL)
Hypericum tetrapetalum FOURPETAL ST.JOHN'S-WORT Native OBL (NWPL) AD (WAP) FAC (DEP)
Hypericum tubulosum LESSER MARSH ST.JOHN'S-WORT Native OBL (NWPL) OBL (DEP)
Hypericum virginicum VIRGINIA MARSH ST.JOHN'S-WORT Native OBL (NWPL) OBL (DEP)
Hypericum walteri GREATER MARSH ST.JOHN'S-WORT Native OBL (NWPL) OBL (DEP)
[Family 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
H. walteri
2.  Petioles absent or inconspicuous, <2 mm long
3
3.  Leaf blade with intramarginal gland-dots only
H. tubulosum
3.  Leaf blade with gland-dots on the surface and intramarginally
H. virginicum
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
H. hypericoides
6.  Larger leaves <1 cm long, without gland-like auricles; bracteoles near the pedicel base; pedicels elongated, reflexed at anthesis
H. suffruticosum
7.  Sepals not enclosing the capsule, subequal with the outer ones only slightly larger than the inner ones
H. microsepalum
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
H. cruxandreae
8.  Outer sepals 5-10 mm wide, obscurely 3-5-veined
9
9.  Leaves subcordate to cordate-clasping
H. tetrapetalum
9.  Leaves cuneate to truncate at the base
H. edisonianum
10.  Leaves 1-4 mm long
11
10.  Larger leaves >5 mm long
12
11.  Plant with several, short non-flowering leafy branches
H. cumulicola
11.  Plant lacking short, non-flowering leafy branches
H. gentianoides
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
H. brachyphyllum
14.  Stem internodes 6-lined at first, becoming 4-lined, then terete; leaf surface dull; capsules 6-10 mm long; of xeric habitats
H. tenuifolium
15.  Plant <1 m tall, with few branches and a narrow crown
H. exile
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
H. lissophloeus
16.  Bark not smooth, not metallic-silvery; plant not glaucous
17
17.  Bark tight, adherent, not exfoliating or only few narrow strips peeling away
H. nitidum
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
H. chapmanii
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
H. fasciculatum
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
H. myrtifolium
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
H. cistifolium
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
H. apocynifolium
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
H. nudiflorum
24.  Inflorescence usually with 1-3 flowers; petals 12-25 mm long
H. frondosum
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
H. galioides
25.  Leaf blades 30–70 mm long; flowers 15–30 mm wide; capsules 7–13 mm long; seeds 1.5–2 mm long
H. prolificum
26.  Leaves linear-subulate; inflorescence racemose
H. drummondii
26.  Leaves linear to obovate; inflorescence cymose
27
27.  Stem and leaves scabrous-tomentose to pilose; sepal margin setulose-ciliate
H. setosum
27.  Stems and leaves glabrate; sepal margin not ciliate
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28.  Leaves, sepals, and/or petals with black punctae
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28.  Leaves, sepals, and petals without black punctae
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29.  Petals 6-14 mm long; anther glands amber or pellucid; styles 5-8 mm long
H. pseudomaculatum
29.  Petals 3-6 mm long; anther glands black; styles 1-4 mm long
H. punctatum
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
H. denticulatum
31.  Plant with numerous branches at the middle and upper nodes; seeds 0.5-0.6 mm long; of seasonally inundated sites
H. harperi
32.  Leaves linear to linear-oblanceolate, 1(3)-nerved
H. canadense
32.  Leaves ovate, deltoid-ovate, to elliptic, (3)5-7-nerved
33
33.  Upper and mid-stem leaves deltoid-ovate, the apex usually acute
H. gymnanthum
33.  Upper and mid-stem leaves ovate-oblong to elliptic, the apex rounded to obtuse
H. mutilum