Flora of North America species comparison

0–10 mm.

100–350 mm, freely branched.

50–300 × 10–30 mm;

blade lanceolate, margins entire, sometimes toothed, veins conspicuous, laterals branching from base, surfaces sparsely hairy.

cauline, opposite, 60–80 × 1–3 mm;

blade linear to linear-lanceolate, margins entire or toothed, veins conspicuous or not, surfaces hairy.

75–150 mm, sparsely hairy.

100–650 mm, hairy.

brownish or greenish, 100–450 mm, loosely flowered, rachis visible between flowers;

bracts ovate, 1 mm, length 0.5–0.6 times sepals.

greenish or brownish, (50–)150–250 mm, densely flowered, eglandular;

bracts proximal strongly differing from distal, ovate, 2–5(–7) mm, length 1–1.5 times sepals, proximal bracts: apex acute.

sepals 2 mm;

corolla radially symmetric, lobes spreading, 1 mm, base obtuse;

stamens 4.

sepals 2–3 mm;

corolla radially symmetric, lobes reflexed, 2–4 mm, base obtuse;

stamens 4.

2, 2 mm.

2, 2–2.5 mm.

= 24.

= 12.