FNA: Hypericum microsepalum vs. Hypericum maculatum

	Hypericum microsepalum	Hypericum maculatum
	flatwoods St. Johnswort	imperforate St. John's wort, spotted St. John's-wort, streaked St. John's-wort
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	Hypericum maculatum
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	FL; GA [WildflowerSearch map] [BONAP county map]	ID; WA; BC; Europe; Asia (Siberia) [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.)	Subspecies 3 (1 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.)
Source	FNA vol. 6, p. 83.	FNA vol. 6, p. 99.
Parent taxa	Hypericaceae > Hypericum > sect. Myriandra	Hypericaceae > Hypericum > sect. Hypericum
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	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. 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
Subordinate taxa		H. maculatum subsp. obtusiusculum
Synonyms	Ascyrum microsepalum, Crookea microsepala, Isophyllum drummondii
Name authority	(Torrey & A. Gray) A. Gray ex S. Watson: Smithsonian Misc. Collect. 258: 456. (1878)	Crantz: Stirp. Austr. Fasc. 2: 64. (1763)
Web links	WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search	Local floras: BC, WA Local Web sites: Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Hypericum maculatum

flatwoods St. Johnswort

imperforate St. John's wort, spotted St. John's-wort, streaked St. John's-wort

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.

= 18.

Hypericum maculatum

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

FL; GA

[WildflowerSearch map]

[BONAP county map]

ID; WA; BC; Europe; Asia (Siberia)

[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.)

Subspecies 3 (1 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source

FNA vol. 6, p. 83.

FNA vol. 6, p. 99.

Parent taxa

Hypericaceae > Hypericum > sect. Myriandra

Hypericaceae > Hypericum > sect. Hypericum

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

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. 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

Subordinate taxa

H. maculatum subsp. obtusiusculum

Synonyms

Ascyrum microsepalum, Crookea microsepala, Isophyllum drummondii

Name authority

(Torrey & A. Gray) A. Gray ex S. Watson: Smithsonian Misc. Collect. 258: 456. (1878)

Crantz: Stirp. Austr. Fasc. 2: 64. (1763)

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).

Choose a data source: Flora of North America, UW Burke Herbarium

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Hypericum microsepalum

Hypericum maculatum

Hypericum microsepalum

Hypericum maculatum