Flora of North America species comparison

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

spreading to suberect, branched at base.

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.

opposite near base or alternate throughout, divergent to widely ascending;

stipular glands present;

blade linear to narrowly linear-lanceolate, 10–30 × 1–3 mm, margins entire, ciliate, apex apiculate.

corymbs.

panicles;

bracts with irregular scarious margins.

1–10 mm.

3–8 mm, stout.

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 deciduous, inner sepals somewhat shorter than outer, regularly and delicately glandular-toothed, outer sepals ovate or obovate, 6–8 mm, margins widely scarious, undulate or crenate, with sessile gland near apex of each crenation, apex conspicuously aristate;

petals yellow, grading to reddish near base, obovate, 9–18 mm;

stamens 5–8 mm;

anthers 1–2 mm;

with or without staminodia;

styles connate nearly to apex, 5–10 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.

ovoid, 3.5–4.5 × 3–3.8 mm, apex obtuse, dehiscing into 5, 2-seeded segments, segments persistent on plant, false septa incomplete, united more than halfway, proximal part membranaceous with basal, 5-sided cartilaginous plates, distal part cartilaginous, constituting more than 1/2 of false septum, margins not ciliate.

1–1.5 × 0.6–0.9 mm.

2.3–2.8 × 1–1.3 mm.

= 36.

= 30