Flora of North America species comparison

internodes 2–4-lined at first, then 2-winged.

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

blades usually oblong to elliptic, rarely obovate to oblanceolate or triangular-ovate, 12–36 × 6–16 mm, base articulated, rounded to slightly cordate-amplexicaul, without glandlike auricles, margins plane to subrecurved, apex rounded to obtuse, midrib with to 3 pairs of branches.

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

± narrowly cylindric to narrowly pyramidal, 1–3(–7)-flowered, branching dichasial, from to 4 proximal nodes.

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

20–30 mm diam.;

sepals persistent, enclosing capsule, 4, unequal, outer broadly ovate to circular, 9–20 × 9–18 mm, apex apiculate or obtuse to rounded, inner narrowly elliptic to lanceolate, 7–14 × 2–4 mm, apex acute to subacute;

petals 4, bright yellow, obovate, 11–18 mm;

stamens persistent, 80–100;

ovary 3(–4)-merous.

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.

narrowly ellipsoid-ovoid, 7–10 × 5–6.5 mm.

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

not carinate, 0.8 mm;

testa shallowly scalariform.

not carinate, 0.4–0.6 mm;

testa finely reticulate.

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

= 18.

= 18.