The green links below add additional plants to the comparison table. Blue links lead to other Web sites.
enable glossary links

smooth-bark St. John's wort

Habit Herbs perennial, semiaquatic or aquatic, erect, branching with long-creeping rhizomes at aerenchymatous base and from mid and distal nodes, 3–10 dm. Shrubs, erect, sparsely branched, forming dense clumps sometimes with prop roots, to 40 dm, bark smooth and metallic-silvery, without laticifers, exfoliating in thin, curled plates.
Stems

internodes 4-lined.

internodes 4-lined at first, soon 4-angled, then terete, dull silvery, glaucous.

Leaves

ascending to deflexed, sessile;

blade narrowly oblong-elliptic (proximal) or lanceolate to linear-lanceolate, 10–30 × 3–8 mm, mostly longer than internodes, not or scarcely smaller distally, leathery, margins plane, apex acute, basal or near-basal veins 1–3(–5), midrib with 0–2 pairs of branches.

blades linear-subulate to acicular, (9–)12–17 × 0.5–0.8 mm, glaucous, base articulated, parallel or almost so, margins revolute, apex obtuse to rounded, midrib unbranched.

Inflorescences

broadly pyramidal to subcorymbiform, 1(–30)-flowered, branching mostly dichasial.

narrowly cylindric, 1–3-flowered, usually with paired flowers or triads from to 9 proximal nodes.

Flowers

4–10 mm diam.;

sepals lanceolate, usually unequal, 3–5 × 0.8–1 mm, margins sometimes ciliate, not setulose-ciliate, apex acute to acuminate;

petals orange-yellow, obovate, 6–10 mm;

stamens 50–80, irregularly grouped;

styles 2–4 mm;

stigmas capitate.

20 mm diam.;

sepals deciduous, not enclosing capsule, 5, linear-subulate, subequal, 7–8 × 0.5–0.8 mm, glaucous;

petals 5, bright yellow, obovate-spatulate, 10–12 mm;

stamens deciduous, 170–220;

ovary 3-merous;

styles 5 mm.

Capsules

ellipsoid to rostrate-subglobose, 3–4.5 × 2–2.5 mm.

narrowly ovoid to ellipsoid, 6–7 × 2.5–3.5 mm.

Seeds

0.5–0.6(–0.7) mm;

testa obscurely linear-reticulate to irregularly reticulate.

narrowly carinate, 1–1.6 mm;

testa coarsely reticulate-sulcate.

2n

= 24.

= 18.

Hypericum harperi

Hypericum lissophloeus

Phenology Flowering mid–late summer (Jul–Sep). Flowering summer–early fall (Jun–Oct).
Habitat Open Taxodium swamps, wet pine barrens Pond and lake margins to 1.5 m deep water
Elevation 0–200 m (0–700 ft) 0–10 m (0–0 ft)
Distribution
from FNA
AL; FL; GA; SC
[BONAP county map]
from FNA
FL
[BONAP county map]
Discussion

Of conservation concern.

Hypericum lissophloeus is found in Bay and Washington counties. The larger capsules, one- to three-flowered, lateral inflorescence branches, and smooth-polished, metallic bark (that exfoliates like that of Betula species) are among the features that distinguish H. lissophloeus from H. fasciculatum, H. nitidum, and their allies (H. brachyphyllum and H. chapmanii).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 6, p. 90. FNA vol. 6, p. 80.
Parent taxa Hypericaceae > Hypericum > sect. Brathys Hypericaceae > Hypericum > sect. Myriandra
Sibling taxa
H. adpressum, H. anagalloides, H. apocynifolium, H. ascyron, H. boreale, H. brachyphyllum, H. buckleyi, H. canadense, H. canariense, H. chapmanii, H. cistifolium, H. concinnum, H. crux-andreae, H. cumulicola, H. densiflorum, H. denticulatum, H. dolabriforme, H. drummondii, H. edisonianum, H. ellipticum, H. erythreae, H. fasciculatum, H. frondosum, H. galioides, H. gentianoides, H. graveolens, H. gymnanthum, H. hypericoides, H. kalmianum, H. lissophloeus, H. lloydii, H. lobocarpum, H. maculatum, H. majus, H. microsepalum, H. mutilum, H. myrtifolium, H. nitidum, H. nudiflorum, H. paucifolium, H. perforatum, H. prolificum, H. pseudomaculatum, H. punctatum, H. radfordiorum, H. scouleri, H. setosum, H. sphaerocarpum, H. suffruticosum, H. tenuifolium, H. tetrapetalum, H. virgatum, H. ×mitchellianum
H. adpressum, H. anagalloides, H. apocynifolium, H. ascyron, H. boreale, H. brachyphyllum, H. buckleyi, H. canadense, H. canariense, H. chapmanii, H. cistifolium, H. concinnum, H. crux-andreae, H. cumulicola, H. densiflorum, H. denticulatum, H. dolabriforme, H. drummondii, H. edisonianum, H. ellipticum, H. erythreae, H. fasciculatum, H. frondosum, H. galioides, H. gentianoides, H. graveolens, H. gymnanthum, H. harperi, H. hypericoides, H. kalmianum, H. lloydii, H. lobocarpum, H. maculatum, H. majus, H. microsepalum, H. mutilum, H. myrtifolium, H. nitidum, H. nudiflorum, H. paucifolium, H. perforatum, H. prolificum, H. pseudomaculatum, H. punctatum, H. radfordiorum, H. scouleri, H. setosum, H. sphaerocarpum, H. suffruticosum, H. tenuifolium, H. tetrapetalum, H. virgatum, H. ×mitchellianum
Name authority R. Keller: Bot. Jahrb. Syst. 58: 198. (1923) W. P. Adams: Contr. Gray Herb. 189: 21. (1962)
Web links