|
flatwoods St. Johnswort
|
great or giant St. John's wort, great St. John's-wort
|
| Shrubs, erect to ascending, bushy, with ± numerous, sometimes straggling branches, 1.5–7 dm. |
|
internodes 4-lined at first, eventually 2-lined. |
|
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. |
|
rounded-pyramidal, 1–3-flowered, narrowly branched, sometimes with 1–3-flowered dichasia or branches from to 4 proximal nodes. |
|
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. |
|
cylindric-ellipsoid to narrowly ovoid-conic, 6–8 × 2.5 mm. |
|
not carinate, 0.9–1 mm; testa linear-foveolate. |
|
= 18. |
|
|
|
|
|
| Flowering late winter–spring (Feb–May), late fall (Nov). |
|
| Low, pine flatwoods, moist to wet, on sand |
|
| 0–100 m (0–300 ft) |
|
|
FL; GA
|
CT; IA; IL; IN; KS; MA; MD; MI; MN; MO; NY; OH; PA; VT; WI; ON; QC; Asia (e China, Japan, Korea, Siberia)
|
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.) |
| FNA vol. 6, p. 83. |
FNA vol. 6, p. 97. |
| Hypericaceae > Hypericum > sect. Myriandra |
Hypericaceae > Hypericum > sect. Roscyna |
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. 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 |
|
|
| Ascyrum microsepalum, Crookea microsepala, Isophyllum drummondii |
|
| (Torrey & A. Gray) A. Gray ex S. Watson: Smithsonian Misc. Collect. 258: 456. (1878) |
Linnaeus: Sp. Pl. 2: 783. (1753) |
| |
WildflowerSearch
iNaturalist
USDA Plants Database
Go Botany
IL Wildflowers
KS Wildflowers
MD Biodiversity
MI Flora
MN Wildflowers
MO Plants
