Flora of North America species comparison

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Hypericum microsepalum

flatwoods St. Johnswort
Habit Shrubs, erect to ascending, bushy, with ± numerous, sometimes straggling branches, 1.5–7 dm.
Stems

internodes 4-lined at first, eventually 2-lined.
Leaf

blades narrowly oblong or oblanceolate to linear, 5–15 × 1–3 mm, base not articulated, rounded to cuneate, margins recurved to subrevolute, apex rounded to obtuse, midrib with 1–3 pairs of branches.
Inflorescences

rounded-pyramidal, 1–3-flowered, narrowly branched, sometimes with 1–3-flowered dichasia or branches from to 4 proximal nodes.
Flowers

15–25 mm diam.;

sepals persistent, not enclosing capsule, (3–)4(–5), oblong or elliptic-oblong to linear, subequal or equal, 3–5 × 1–1.4 mm;

petals (3–)4(–5), bright yellow, obovate (larger pair) to obovate-oblong (smaller pair), 10–12 mm;

stamens persistent, 60–70;

ovary 3-merous, placentation parietal.
Capsules

cylindric-ellipsoid to narrowly ovoid-conic, 6–8 × 2.5 mm.
Seeds

not carinate, 0.9–1 mm;

testa linear-foveolate.
2n

= 18.

Hypericum microsepalum
Phenology Flowering late winter–spring (Feb–May), late fall (Nov).
Habitat Low, pine flatwoods, moist to wet, on sand
Elevation 0–100 m (0–300 ft)
Distribution
from FNA
FL; GA
[WildflowerSearch map]
[BONAP county map]
Discussion

Hypericum microsepalum is related to H. cistifolium, not to the other four-petaled species attributed to Ascyrum, and can be distinguished from it by the bushier habit and smaller leaves and by the usually four-merous flowers with larger petals.

Hypericum isophyllum Steudel is an illegitimate name for H. microsepalum.

(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. 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. 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 Ascyrum microsepalum, Crookea microsepala, Isophyllum drummondii
Name authority (Torrey & A. Gray) A. Gray ex S. Watson: Smithsonian Misc. Collect. 258: 456. (1878)
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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