Flora of North America species comparison

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Hypericum lissophloeus

smooth-bark St. John's wort
Habit 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 at first, soon 4-angled, then terete, dull silvery, glaucous.
Leaf

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

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

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

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

narrowly carinate, 1–1.6 mm;

testa coarsely reticulate-sulcate.
2n

= 18.

Hypericum lissophloeus
Phenology Flowering summer–early fall (Jun–Oct).
Habitat Pond and lake margins to 1.5 m deep water
Elevation 0–10 m (0–0 ft)
Distribution
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. 80.
Parent taxa 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. 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 W. P. Adams: Contr. Gray Herb. 189: 21. (1962)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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