Flora of North America species comparison

0–15 mm.

100–400 mm, freely branched.

(25–)50–120 × 1–4 mm;

blade linear, margins entire, rarely toothed, veins conspicuous or not, surfaces villous.

cauline, opposite, 30–60 × 0.75–1 mm;

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

(10–)40–240(–260) mm, hairy, hairs antrorse, long and short and patent, long.

30–80 mm, hairy.

grayish or brownish, 40–120 mm, densely flowered, flowers in whorls or pairs;

bracts triangular or narrowly ovate, 2–10 mm, length 1–2 times sepals, apex acute or acuminate.

greenish or brownish, 40–85 mm, densely flowered;

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

sepals 2.2–4.8 mm;

corolla bilaterally symmetric, lobes reflexed, 1.6–2.1 mm, base cordate;

stamens 4, connective usually elongated, apex acute.

sepals 5–6 mm;

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

stamens 4.

2, 2.2–2.6 mm.

1 or 2, 2 mm.

= 20.

= 12.