Flora of North America species comparison

ascending, branched at base, herbaceous throughout.

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

alternate or sometimes proximal leaves opposite, appressed-ascending;

stipular glands present (conspicuous);

blade linear, 7–20 × 0.6–1.5 mm, margins entire or distal leaves sparsely glandular-toothed, ciliate, apex acute; 1-nerved.

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.

open panicles.

cymes.

5–10 mm.

0–2 mm.

sepals falling tardily, lanceolate, 4–7 mm, margins of inner sepals scarious, glandular-toothed, apex acute to acuminate, puberulent at least on midrib;

outer 3-nerved;

petals yellowish orange to salmon, with maroon or reddish base, obcordate or broadly obovate, 9–15 mm;

stamens 4–7 mm;

anthers 0.6–1.4 mm;

staminodia absent;

styles connate nearly to apex, 3–7 mm;

stigmas dark, 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.

ovoid-ellipsoid, 3.5–4 × 2.5–5 mm, apex obtuse, dehiscing into 5, 2-seeded segments, segments persistent on plant, false septa complete, proximal margin not terminating in loose fringe, distal part cartilaginous, margins 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.

1.5–3 × 0.9–1.3 mm.

1–1.5 × 0.6–1 mm.

= 30.

= 36.