Flora of North America species comparison

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

erect, unbranched proximal to inflorescence or few-branched at base.

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.

proximalmost opposite, distalmost alternate, sometimes opposite nearly to inflorescence, erect to ascending;

stipular glands absent;

blade narrowly elliptic to oblanceolate, 8–27 × 1.2–5.6 mm, margins entire, not ciliate, apex acute;

internal venation shown by transmitted light.

open panicles;

bracts glandular-toothed, not ciliate.

panicles.

1.3–4.7 mm.

0–5 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.

sepals persistent, lanceolate, 2–3 mm, margins not scarious, entire, or inner and rarely outer sparsely glandular-toothed, apex sharp-pointed;

petals yellow, obovate, 4–7 mm;

stamens 3 mm;

anthers 0.5–1 mm;

staminodia absent;

styles distinct, 1.5–2.5 mm;

stigmas capitate.

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.

turbinate, 2–3 × 2–2.3 mm, apex acute or obtuse, dehiscing freely into 10, sharp-pointed 1-seeded segments, segments persistent on plant, false septa incomplete, proximal margins sparsely but conspicuously ciliate.

1.6–2.1 × 0.8–1.1 mm.

1.3–1.8 × 0.6–0.9 mm.

= 30.

= 36.