Flora of North America species comparison

internodes 4-lined at first, then terete.

internodes 4-lined at first, soon 2-winged.

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 elliptic or oblong-linear to narrowly obovate or oblanceolate, 3–10 × 1–3 mm, base not articulated, rounded to cuneate, without glandlike auricles, margins plane to subrecurved, apex obtuse, midrib unbranched.

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.

1-flowered, often with pseudodichotomous branches from apical node, without proximal branches;

pedicels mostly recurved to reflexed in fruit, bracteoles proximal.

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.

10–15 mm diam.;

sepals persistent, enclosing capsule, (2 or) 4, unequal, outer broadly ovate to broadly elliptic, 4–8 × 4–8 mm, apex obtuse to rounded, inner none or minute;

petals 4, pale yellow, narrowly obovate, often unequal, 4–8 mm;

stamens persistent, 30;

ovary 2-merous.

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

cylindric-ellipsoid, 3–5 × 2–3 mm.

not carinate, 0.6 mm;

testa reticulate to linear-foveolate.

scarcely carinate, 1 mm;

testa finely reticulate.

= 18.

= 18.