Flora of North America species comparison

0–15 mm.

100–350 mm, freely branched.

(25–)50–120 × 1–4 mm;

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

cauline, opposite, 60–80 × 1–3 mm;

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

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

100–650 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, (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 2.2–4.8 mm;

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

stamens 4, connective usually elongated, apex acute.

sepals 2–3 mm;

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

stamens 4.

2, 2.2–2.6 mm.

2, 2–2.5 mm.

= 20.

= 12.