Flora of North America species comparison

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Hypericum adpressum

creeping St. John's-wort
Inflorescences

rounded-corymbiform, 13–60-flowered, narrowly branched, without subsidiary branches.
Flowers

10–15 mm diam.;

sepals persistent, not enclosing capsule, 5, ovate-lanceolate to lanceolate, subequal, (2–)4–7 × 1–1.5 mm;

petals 5, bright yellow, obovate-oblanceolate, 6–8 mm;

stamens persistent, 60–80;

ovary 3-merous, placentation parietal.
Capsules

ellipsoid to ovoid-ellipsoid, 3.5–6 × 2–4 mm.
Seeds

slightly carinate, 0.6–0.7 mm;

testa scalariform.
2n

= 18.

Hypericum adpressum
Phenology Flowering late summer (Jul–Sep).
Habitat Marshes, pond margins, wet ditches, bogs, coastal plain
Elevation 0–1000 m (0–3300 ft)
Distribution
from FNA
CT; DE; GA; IL; IN; MA; MD; MO; NC; NJ; NY; PA; RI; SC; TN; VA; WV
[WildflowerSearch map]
[BONAP county map]
Discussion

Hypericum adpressum is more herbaceous and rhizomatous than H. sphaerocarpum and has narrower capsules and smaller seeds.

The plants with aerenchymatous tissue in the rhizome (var. spongiosum) are not taxonomically distinct but merely the result of a habitat-induced modification.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 6, p. 83.
Parent taxa Hypericaceae > Hypericum > sect. Myriandra
Sibling taxa
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. 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 Brathydium fastigiatum, H. adpressum var. fastigiatum, H. adpressum var. spongiosum, H. bonaparteae, H. fastigiatum, Myriandra adpressa
Name authority W. P. C. Barton: Comp. Fl. Philadelph. 2: 15. (1818)
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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