Flora of North America species comparison

0–12 mm.

20–40 mm.

50–130 × 3–7 mm;

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

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.

80–250 mm, hairy, hairs patent, long and antrorse, short.

100–500 mm, hairy, hairs antrorse, long and short.

greenish, whitish, or brownish, 50–120 mm, densely flowered, flowers in whorls or pairs;

bracts triangular, 2.5–8 mm, length 0.6–2.2 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 3.5–4 mm;

corolla radially symmetric, lobes reflexed, 3–3.6 mm, base 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, 3.2–3.8 mm.

2, 2.5–2.9 mm.

= 20.

= 20.