Hypericum sphaerocarpum
Hypericum gentianoides
round-fruit St. John's-wort, roundseed St. Johnswort
orange-grass, orange-grass St. John's-wort, pineweed, pinweed St. Johnswort
internodes 2–4-lined.
internodes 4-lined.
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.
appressed, sessile;
blade narrowly triangular-subulate to linear-subulate, scalelike, 1–4 × 0.4–0.6 mm, subcoriaceous to chartaceous, margins incurved, apex obtuse to rounded, basal vein 1, midrib unbranched.
rounded-corymbiform, 7–70-flowered, narrowly branched, sometimes with dichasia or branches from to 8 proximal nodes.
usually pyramidal, 1–24-flowered, branching mostly monochasial.
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.
3–5 mm diam.;
sepals lanceolate to narrowly oblong or linear-lanceolate, unequal, 1.5–2.5 × 0.4–0.8 mm, apex acute;
petals orange-yellow to golden yellow, oblong, 2–4 mm;
stamens 5–11, 5 separate or obscurely 5-grouped;
styles 0.8–1.2 mm;
stigmas broadly capitate.
broadly ovoid to depressed-globose, 4.5–8 × 4–7 mm.
narrowly cylindric-conic, 4–5 × 1–1.2 mm, length 2–2.7 times sepals.
carinate, 2–2.7 mm;
testa coarsely reticulate.
0.4–0.8 mm;
testa markedly ribbed-scalariform.
= 24.
Hypericum sphaerocarpum
Hypericum gentianoides
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 gentianoides is smaller in all parts than H. drummondii and more branched. The relatively long, narrow capsule is diagnostic, as are the relatively small, often scalelike leaves.
Hypericum sarothra Michaux and Sarothra hypericoides Nuttall are illegitimate names that pertain here.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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