Flora of North America species comparison

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

erect, usually multiple from base, sometimes 1, unbranched or few-branched proximal to inflorescence, slender, wiry, prominently ribbed in inflorescence.

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.

early deciduous, alternate or basalmost opposite, appressed-ascending;

stipular glands present, reddish, becoming dark;

blade linear, 5–15 × 0.5–1.2 mm, margins entire or with scattered minute marginal glands, not ciliate, apex acute; 1-nerved.

corymbs.

cymes.

1–10 mm.

0–2 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.

sepals persistent, lanceolate to ovate or inner ones sometimes obovate, outer sepals 2.5–3.6 mm, margins hyaline, not scarious, all glandular-toothed, apex acuminate;

petals yellow, obovate, 4–6.5 mm;

stamens 3 mm;

anthers 0.3–0.7 mm;

staminodia present or absent;

styles distinct, 2–3 mm;

stigmas capitate.

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.

pyriform, 2–2.5 mm diam., apex pointed, dehiscing readily into 10, 1-seeded segments, segments falling freely, false septa incomplete, margins of septa ciliate.

1–1.5 × 0.6–0.9 mm.

1–1.5 × 0.6–1 mm.

= 36.

= 36.