Flora of North America species comparison

internodes 4-lined at first, becoming 2-winged, then terete.

blades linear or linear-subulate, 9–26 × 0.5–1.5 mm, base articulated, narrowly cuneate or parallel, margins revolute, apex rounded or acute to long-acuminate with prominent hydathode, midrib unbranched.

rounded-corymbiform, 13–60-flowered, narrowly branched, without subsidiary branches.

narrowly to broadly cylindric, 3–15-flowered, sometimes with 1–3(–7)-flowered dichasia from to 6 proximal nodes, sometimes with 1–2 pairs of additional flowering branches.

10–15 mm diam.;

sepals persistent, not enclosing capsule, 5, ovate-lanceolate to lanceolate, subequal, (2–)4–7 × 1–1.5 mm;

petals 5, bright yellow, obovate-oblanceolate, 6–8 mm;

stamens persistent, 60–80;

ovary 3-merous, placentation parietal.

10–18 mm diam.;

sepals deciduous, not enclosing capsule, 5, linear-subulate, unequal to subequal, 3.5–7 × 0.4–0.8 mm;

petals 5, yellow, obovate to elliptic-lanceolate, (5–)6–10 mm;

stamens deciduous, 50–80(–115);

ovary 3-merous;

styles shorter than ovaries.

ellipsoid to ovoid-ellipsoid, 3.5–6 × 2–4 mm.

narrowly conic to cylindric, (4.5–)5–7 × (1.3–)2–3 mm.

slightly carinate, 0.6–0.7 mm;

testa scalariform.

scarcely carinate, 0.5 mm;

testa finely reticulate.

= 18.