Flora of North America species comparison

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

internodes 4-lined at first, then 2-lined to 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 usually oblong to lanceolate-oblong, sometimes oblanceolate, 25–65 × 8–22 mm, base articulated, broadly to narrowly cuneate, margins plane or subrecurved, apex apiculate-obtuse to rounded, midrib with 10–16 pairs of branches.

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

1–3(–7)-flowered from apical node, sometimes with paired single flowers or triads (3-flowered cymules) or 1–3-flowered branches at proximal node.

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.

24–45 mm diam.;

sepals deciduous, not enclosing capsule, (4)5, ovate or oblong to elliptic-spatulate, unequal, 6–14(–20) × 4–10 mm;

petals (4–)5, golden yellow to orange-yellow, obovate to oblanceolate, 12–25 mm;

stamens deciduous, 250–650;

ovary 3-merous.

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

ovoid-conic to ovoid-rostrate, 12–15 × 6–8 mm.

not carinate, 0.8 mm;

testa shallowly scalariform.

carinate, 1.5 mm;

testa linear-reticulate.

= 18.

= 18.