Flora of North America species comparison

multiple, erect, straight;

branches distal, distal longest, antrorse, straight; hairy.

multiple, erect, zigzag or straight;

branches distal or along entire stem, distal longest or all ± equal, antrorse, upcurved; hairy.

blade 25–100 × 1–18.1 mm, widest intersinus distance 1–4.2 mm;

proximal spatulate to elliptic, margins entire or dentate to pinnatisect, teeth or lobes 0–26, slightly antrorse, 0.6–9.5 mm;

distal oblanceolate, elliptic, or lanceolate, base not clasping, margins entire, serrate, or pinnatisect, teeth or lobes 0–24, slightly antrorse, 0.4–7.1 mm;

abaxial surface with needlelike and occasionally simple and complex grappling-hook trichomes, adaxial surface with simple grappling-hook and needlelike trichomes.

blade 17–94 × 12–32 mm, widest intersinus distance 9.5–29 mm;

proximal broadly spatulate to elliptic, margins serrate, teeth 6–12, slightly antrorse or perpendicular to leaf axis, 0.4–1.5 mm;

distal broadly spatulate, elliptic, or obovate, base not clasping, margins serrate, teeth 8–10, slightly antrorse or perpendicular to leaf axis, 1–3.6 mm;

abaxial surface with complex grappling-hook and occasionally with simple grappling-hook and needlelike trichomes, adaxial surface with needlelike trichomes.

margins usually entire, occasionally pinnate.

margins entire.

petals light yellow, 11.4–19(–22.7) × 1.8–3.6(–5) mm, apex acute, glabrous abaxially;

stamens light yellow, 5 outermost petaloid, filaments narrowly spatulate, slightly clawed, 11–18.1(–22.7) × (0.5–)1–3.7 mm, without anthers, second whorl without anthers;

anthers straight after dehiscence, epidermis papillate;

styles 7.5–11.4 mm.

petals white to light yellow, 9.4–17.4(–20) × 1.7–4.3 mm, apex acute to rounded, glabrous abaxially;

stamens white to light yellow, 5 outermost petaloid, filaments narrowly spatulate, slightly clawed, 8.5–18 × 1–1.3(–2.9) mm, without anthers, second whorl with anthers;

anthers straight after dehiscence, epidermis papillate;

styles 5.8–9 mm.

cup-shaped, 6.8–12 × (4–)4.8–9.1 mm, base tapering or rounded, not longitudinally ridged.

cup-shaped, 4.9–10.3 × 4.6–8.6 mm, base rounded, not longitudinally ridged.

coat anticlinal cell walls wavy, papillae 6–14 per cell.

coat anticlinal cell walls straight to slightly wavy, papillae 8–14 per cell.

= 18.