Flora of North America species comparison

0–10 mm.

100–400 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, 30–60 × 0.75–1 mm;

blade linear to linear-lanceolate, margins entire, veins inconspicuous, surfaces hairy.

75–150 mm, sparsely hairy.

30–80 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, 40–85 mm, densely flowered;

bracts broadly ovate, 5–6 mm, lengths equal to sepals.

sepals 2 mm;

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

stamens 4.

sepals 5–6 mm;

corolla radially symmetric, lobes reflexed, 3–3.5 mm, base obtuse;

stamens 4.

2, 2 mm.

1 or 2, 2 mm.

= 24.

= 12.