Flora of North America species comparison

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Hypericum chapmanii

Apalachicola St. Johnswort
Habit Shrubs, erect, treelike, to 40 dm, bark thick-corky, striate, exfoliating in thin, papery sheets or plates.
Stems

internodes 4-lined at first, soon 4-angled, then terete, not glaucous.
Leaf

blades linear-subulate, 8–25 × 0.5–0.7 mm, not glaucous, base articulated, parallel or slightly expanded, margins revolute, apex acute, midrib unbranched.
Inflorescences

shortly cylindric, 1–3-flowered, often with single flowers or triads from 1–2 proximal nodes.
Flowers

12–15 mm diam.;

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

petals 5, bright yellow, oblong-spatulate, 7–9 mm;

stamens deciduous, 75;

ovary 3-merous;

styles 2.5–4 mm.
Capsules

narrowly pyramidal-ovoid, 6 × 2.4 mm.
Seeds

not carinate, 0.6–0.8 mm;

testa finely foveolate-reticulate.

Hypericum chapmanii
Phenology Flowering summer (Jun–Aug).
Habitat Pond margins, flatwoods, depressions
Elevation 0–10 m (0–0 ft)
Distribution
from FNA
FL
[BONAP county map]
Discussion

Hypericum chapmanii differs from H. fasciculatum in its taller, single-stemmed habit, thicker stems (to 10–15 cm diameter) with fluted, spongy bark containing large laticifers, and fewer-flowered inflorescences.

Hypericum chapmanii is known from the panhandle of northwestern Florida.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 6, p. 81.
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. 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. 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
Synonyms H. arborescens
Name authority W. P. Adams: Contr. Gray Herb. 189: 22. (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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