Hypericum sphaerocarpum |
Hypericum erythreae |
|
---|---|---|
round-fruit St. John's-wort, roundseed St. Johnswort |
sparse-leaf St. Johnswort |
|
Habit | Herbs (perennial) or subshrubs, erect or decumbent, not or rarely rhizomatous, unbranched or branched proximally, 2–6 dm. | Herbs perennial, erect to ascending, branching at ± aerenchymatous base and in inflorescence, 3–12 dm. |
Stems | internodes 2–4-lined. |
internodes 4-lined. |
Leaves | 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. |
ascending to appressed, sessile; blade usually lanceolate, rarely elliptic to ovate, 5–20(–24) × 5–15 mm, shorter than internodes, smaller distally, leathery, margins plane, apex acute, gland-dotted, less conspicuously adaxially, basal veins 1–5, midrib with 2–3 pairs of branches. |
Inflorescences | rounded-corymbiform, 7–70-flowered, narrowly branched, sometimes with dichasia or branches from to 8 proximal nodes. |
corymbiform, to 30-flowered, branching mostly dichasial. |
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. |
5–13 mm diam.; sepals lanceolate, unequal, 3.5–4.2(–4.8) mm, margins sometimes ciliate, not setulose-ciliate, apex acute to subacuminate; petals orange-yellow, ± obovate, 5–10 mm; stamens 50–80, filaments basally connate; styles 2–4 mm; stigmas clavate. |
Capsules | broadly ovoid to depressed-globose, 4.5–8 × 4–7 mm. |
ovoid, 3–4.5 mm. |
Seeds | carinate, 2–2.7 mm; testa coarsely reticulate. |
0.4–0.7 mm; testa reticulate. |
Hypericum sphaerocarpum |
Hypericum erythreae |
|
Phenology | Flowering summer (Jun–Aug). | Flowering mid summer–fall (Jul–Oct). |
Habitat | Rocky outcrops or embankments, prairies, stream banks, usually wet or moist, railroad embankments | Bogs, ditches, coastal plain |
Elevation | 500–1000 m (1600–3300 ft) | 0–300 m (0–1000 ft) |
Distribution |
AL; AR; IA; IL; IN; KS; KY; MI; MO; MS; NE; OH; OK; TN; TX; WI; ON
|
GA; 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.) |
|
Source | FNA vol. 6, p. 83. | FNA vol. 6, p. 90. |
Parent taxa | Hypericaceae > Hypericum > sect. Myriandra | Hypericaceae > Hypericum > sect. Brathys |
Sibling taxa | ||
Synonyms | Brathydium chamaenerium, B. sphaerocarpum, H. chamaenerium, H. sphaerocarpum var. turgidum, H. turgidum | Brathys erythreae |
Name authority | Michaux: Fl. Bor.-Amer. 2: 78. (1803) | (Spach) Steudel: Nomencl. Bot. ed. 2, 1: 787. (1840) |
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