Flora of North America species comparison

internodes 2–4-lined.

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

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

rounded-corymbiform, 7–70-flowered, narrowly branched, sometimes with dichasia or branches from to 8 proximal nodes.

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

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.

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.

broadly ovoid to depressed-globose, 4.5–8 × 4–7 mm.

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

carinate, 2–2.7 mm;

testa coarsely reticulate.

not carinate, 0.4–0.6 mm;

testa finely reticulate.

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

= 18.