Flora of North America species comparison

erect to ascending, unbranched proximally, few to many branches above middle, conspicuously sulcate.

terete, ridged, or sulcate.

proximal 0–13 pairs opposite (often fallen at anthesis), distal alternate, appressed-ascending;

stipular glands usually present, very rarely absent;

blade linear to narrowly lanceolate, 7–30 × 1–3 mm, margins entire, distal leaves not ciliate, apex acute to subulate;

midrib prominent, marginal nerves less conspicuous.

alternate, opposite, or whorled;

stipular glands present or absent;

blade margins entire or glandular-toothed, sometimes ciliate.

open panicles;

bracts glandular-toothed, not ciliate.

1.3–4.7 mm.

sepals persistent, lanceolate, (3.1–)3.6–5(–7.3) mm, inner sepals more delicate than outer, shorter, margins not scarious, all very conspicuously glandular-toothed, apex acuminate, central and marginal veins conspicuous;

petals pale yellow, obovate, 5–10 mm;

stamens 3.3–5.7 mm;

anthers 0.3–0.7 mm;

staminodia absent;

styles connate 0.2–1.8 mm at base, 2–4.5 mm;

stigmas capitate.

homostylous;

sepals persistent or deciduous, margins scarious or not, glandular-toothed or not;

petals yellow, sometimes with maroon at base;

staminodia present or absent;

styles distinct or connate nearly to apex;

stigmas usually capitate, rarely linear.

globose, 2.5–3.3 × 2.1–3 mm, apex rounded to acute, dehiscing freely into 10, sharp-pointed, 1-seeded segments;

segments persistent on plant, false septa incomplete, margins prominently ciliate.

dehiscing into 10, 1-seeded segments or 5, 2-seeded segments;

false septa incomplete to complete.

1.6–2.1 × 0.8–1.1 mm.

tricolpate or multiporate.

= 30.