Flora of North America species comparison

0–10 mm.

20–40 mm.

50–120 × 1–4 mm;

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

30–200 × 3–7 mm;

blade linear or narrowly lanceolate, margins entire, rarely toothed, veins conspicuous or not, abaxial surface villous, adaxial glabrous or sparsely villous.

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

100–500 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, 80–150 mm, densely flowered, flowers in whorls or pairs;

bracts almost linear, 15–30 mm, length 2–12 times sepals.

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 2.7–3.7 mm;

corolla bilaterally symmetric, lobes reflexed, adaxials 1.4–2.3 mm, laterals symmetric, base deeply cordate;

stamens 4, connective elongated, apex acute.

2, 2.1–2.9 mm.

2, 2.5–2.9 mm.

= 20.

= 20.