Flora of North America species comparison

erect, branches 1–several from base, unbranched proximal to inflorescence.

terete, ridged, or sulcate.

proximal 4–10 pairs opposite, distal alternate, erect to spreading;

stipular glands absent;

blade of proximal leaves spatulate, central and distal elliptic, oblanceolate, or obovate, 15–25 × 3–7 mm, margins entire, not ciliate, apex acute to apiculate.

alternate, opposite, or whorled;

stipular glands present or absent;

blade margins entire or glandular-toothed, sometimes ciliate.

corymbs.

1–10 mm.

sepals persistent, lanceolate-ovate, inner shorter, broader, thinner than outer, outer sepals 2–4 mm, margins not scarious, inner sepals usually with a few small, sessile glands along margin distal to middle, rarely eglandular, outer ones entire, apex acute to acuminate;

petals yellow, obovate (sometimes notched at apex), 3–5.5 mm;

stamens 1.2–3 mm;

anthers 0.5–1 mm;

staminodia absent;

styles distinct, 1–2 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, carpels flattened or ± concave abaxially, 1.3–1.8 × 2–2.5 mm, apex depressed, dehiscing freely into 10, 1-seeded segments, segments falling freely, false septa nearly complete, proximal margins usually sparsely and inconspicuously few-ciliate.

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

false septa incomplete to complete.

1–1.5 × 0.6–0.9 mm.

tricolpate or multiporate.

= 36.