Flora of North America species comparison

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Hypericum myrtifolium

myrtleleaf St. Johnswort
Habit Shrubs, erect, with woody caudex, unbranched or branched distally, 3–10 dm, bark on older stems corky.
Stems

internodes 4-lined.
Leaf

blades oblong-ovate to triangular-lanceolate, 8–40 × (5–)7–20 mm, base articulated, subcordate-amplexicaul, margins recurved, apex rounded, midrib with 3 or 4 pairs of branches.
Inflorescences

hemispheric to ± flat-topped, 7–30-flowered, widely branched, with flowers or flowering branches from to 3 proximal nodes.
Flowers

15–25 mm diam.;

sepals persistent, not enclosing capsule, 5, ovate to lanceolate, unequal to subequal, 5–8 × 2–4.5 mm;

petals 5, bright yellow, obovate to oblong-lanceolate, 8–15 mm;

stamens deciduous, 200;

ovary 3(–4)-merous.
Capsules

pyramidal-ovoid, 5–6 × 3–4 mm.
Seeds

narrowly carinate, 1 mm;

testa shallowly linear-reticulate.
2n

= 18.

Hypericum myrtifolium
Phenology Flowering late spring–summer (May–Jul), sometimes fall.
Habitat Moist pinewoods, grassy bogs, pond margins, ditches
Elevation 0–200 m (0–700 ft)
Distribution
from FNA
AL; FL; GA; MS; SC
[WildflowerSearch map]
[BONAP county map]
Discussion

Hypericum myrtifolium is related to H. frondosum; it differs in its shorter, usually amplexicaul leaves, the widely dichasially branched inflorescences, and persistent sepals.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 6, p. 84.
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. lissophloeus, H. lloydii, H. lobocarpum, H. maculatum, H. majus, H. microsepalum, H. mutilum, 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 Brathydium myrtifolium, H. glaucum, H. sessiliflorum, Myriandra glauca
Name authority Lamarck: in J. Lamarck et al., Encycl. 4: 180. (1797)
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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