Flora of North America species comparison

0–10 mm.

0–20 mm.

50–120 × 1–4 mm;

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

45–140 × 1.5–4 mm;

blade linear, margins entire, veins conspicuous or not, surfaces sericeous, rarely lanate.

200–1500 mm, hairy, hairs antrorse, long and short.

300–1300 mm, hairy, hairs antrorse, long and short.

greenish or brownish, 70–150 mm, densely flowered, flowers in whorls or pairs;

bracts ovate, 1–2 mm, length 0.3–0.8 times sepals.

greenish or brownish, 70–200 mm, densely or loosely flowered, flowers in whorls or pairs;

bracts ovate, 1.5–2 mm, length 0.4–0.7 times sepals, apex acute.

sepals 2.5–3.4 mm;

corolla radially symmetric, lobes reflexed, 2–2.7 mm, base obtuse or slightly cordate;

stamens 4, connective elongated, apex acute.

sepals 2.6–3.3 mm;

corolla bilaterally symmetric, lobes reflexed, 1.7–2.6 mm, base cordate;

stamens 4, connective slightly elongated, apex obtuse.

2, 2.1–2.9 mm.

2, 2.3–2.8 mm.

= 20.