Flora of North America species comparison

internodes 4-lined at first, then terete.

internodes sometimes 4-lined at first, soon 2-winged, not terete.

blades narrowly oblong or narrowly elliptic-oblong to triangular-lanceolate, 15–40 × 2–10 mm, base not articulated, cuneate to subcordate, margins recurved, apex subacute to rounded, midrib with 1 pair of branches.

blades linear, 6–12 × 0.5–0.7 mm, base articulated deciduous with leaf, cf.

corymbiform to cylindric, (7–)15–65-flowered, narrowly branched, sometimes with 3–65-flowered dichasia from 1–2 proximal nodes and relatively short, flowering branches from further 1–4 nodes.

± narrowly cylindric, 3–15-flowered, with 3–5-flowered dichasia or flowering branches from to 10 proximal nodes.

7–12 mm diam.;

sepals persistent, not enclosing capsule, 5, obovate or broadly elliptic to oblong, unequal, 2–4 × 1–1.7 mm;

petals 5, bright yellow, oblanceolate, 5–8 mm;

stamens (some or all) persistent, 30–50;

ovary 3-merous, placentation parietal.

10–13 mm diam.;

sepals deciduous, not enclosing capsule, 5, linear, unequal, 2.5–4.5 × 0.5–1 mm;

petals 5, bright yellow, obovate-spatulate, 5–8 mm;

stamens deciduous, 40–45;

ovary 3-merous;

styles longer than ovaries.

ovoid-cylindric to broadly ovoid, 4–6 × 3–4 mm.

narrowly cylindric to narrowly ovoid-conic, 3.5–5 × 1.5–2 mm.

not carinate, 0.6 mm;

testa reticulate to linear-foveolate.

not carinate, 0.4–0.6 mm;

testa finely reticulate.

. H. tenuifolium, parallel, margins revolute, apex rounded-apiculate, midrib unbranched.

= 18.

= 18.