Hypericum sphaerocarpum |
Hypericum buckleyi |
|
---|---|---|
round-fruit St. John's-wort, roundseed St. Johnswort |
mountain St. John's wort |
|
Habit | Herbs (perennial) or subshrubs, erect or decumbent, not or rarely rhizomatous, unbranched or branched proximally, 2–6 dm. | Shrubs, decumbent, spreading and rooting, wiry, branches ascending to erect, forming compact mats, 0.5–4.5 dm. |
Stems | internodes 2–4-lined. |
internodes 4-lined. |
Leaf | blades narrowly elliptic or narrowly oblong to linear, 30–70 × 3–15 mm, base not articulated, narrowly cuneate to linear, margins plane to revolute, apex subacute to rounded, midrib with 0–4 pairs of branches. |
blades oblong or elliptic to obovate, 4–25 × 2–12 mm, base not articulated, cuneate, margins plane, apex rounded, midrib with 2–4 pairs of branches. |
Inflorescences | rounded-corymbiform, 7–70-flowered, narrowly branched, sometimes with dichasia or branches from to 8 proximal nodes. |
1(–5)-flowered. |
Flowers | 10–15 mm diam.; sepals persistent, not enclosing capsule, 5, broadly ovate to oblong-elliptic, ± unequal, 2.5–5 × 1.5–3 mm; petals 5, bright yellow, oblanceolate-elliptic to elliptic, 5–9 mm; stamens persistent, 45–85; ovary 3-merous, placentation parietal. |
20–25 mm diam.; sepals persistent, not enclosing capsule, 5, broadly elliptic to elliptic-spatulate or obovate, subequal, 4–5 × 2.5–3 mm; petals 5, golden yellow, oblanceolate, 6–10.5 mm; stamens persistent, 100; ovary 3-merous. |
Capsules | broadly ovoid to depressed-globose, 4.5–8 × 4–7 mm. |
ovoid to ovoid-cylindric, 8–12 × 5 mm. |
Seeds | carinate, 2–2.7 mm; testa coarsely reticulate. |
narrowly to broadly carinate, 1.5–2 mm; testa finely foveolate-reticulate. |
Hypericum sphaerocarpum |
Hypericum buckleyi |
|
Phenology | Flowering summer (Jun–Aug). | Flowering early–mid summer (Jun–Jul). |
Habitat | Rocky outcrops or embankments, prairies, stream banks, usually wet or moist, railroad embankments | Seepage areas, moist rock crevices, ditches, road embankments |
Elevation | 500–1000 m (1600–3300 ft) | 900–1600 m (3000–5200 ft) |
Distribution |
AL; AR; IA; IL; IN; KS; KY; MI; MO; MS; NE; OH; OK; TN; TX; WI; ON
|
GA; NC; SC |
Discussion | Hypericum sphaerocarpum differs from H. cistifolium and H. nudiflorum in its semiherbaceous habit and more northwestern distribution, as well as in its combination of relatively long, narrow leaves, persistent sepals, globose and apiculate to rounded capsules, and relatively large seeds. The narrow-leaved, bushy form from eastern parts of the range (var. turgidum) merges with the typical form. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Hypericum buckleyi is found throughout the southern Appalachian Mountains. The decumbent habit and persistent sepals and stamens distinguish Hypericum buckleyi from its nearest relative, H. prolificum. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 6, p. 83. | FNA vol. 6, p. 81. |
Parent taxa | Hypericaceae > Hypericum > sect. Myriandra | Hypericaceae > Hypericum > sect. Myriandra |
Sibling taxa | ||
Synonyms | Brathydium chamaenerium, B. sphaerocarpum, H. chamaenerium, H. sphaerocarpum var. turgidum, H. turgidum | |
Name authority | Michaux: Fl. Bor.-Amer. 2: 78. (1803) | M. A. Curtis: Amer. J. Sci. Arts 44: 80. (1843) |
Web links |