Flora of North America species comparison

developed;

roots short, fibrous, lignescent, non-tuberiferous.

not developed;

roots often long and rhizomelike, lignescent, non-tuberiferous.

branched proximally, 10–40 cm, faces subequal, flat to convex, 4-angled distally from midstem, internodes and nodes hirsute, hairs eglandular.

mostly unbranched proximally, usually branched distally, 10–40 cm, faces subequal, angles weakly ridged, internodes glabrous or sparsely hirsute, hairs minutely gland-tipped, nodes hirsute, hairs eglandular.

subsessile;

blade spatulate to oblanceolate or elliptic, 2–3 cm × 2–8 mm, 2 lateral veins marginal on narrower leaves, margins subentire to shallowly serrate, surfaces loosely strigose, hairs yellowish.

petiole 1–5 mm;

blade broadly ovate to elliptic, 1.5–3 cm ×4–8 mm, margins finely serrate, surfaces sparsely strigose.

diffuse, not obscured by bracts.

diffuse, not obscured by bracts.

hypanthium globose, much longer than the constricted neck, 6–7 mm, hirsute to villous, eglandular;

calyx lobes triangular, apices aristate;

petals ascending, golden-yellow, 1–1.5 cm;

anthers straight, 2 mm.

hypanthium subglobose, much longer than the constricted neck, 5–7 mm, sparsely hirsute apically, hairs gland-tipped;

calyx lobes triangular, apices short-acuminate;

petals spreading, white or pale lavender, 0.8–1(–1.3) cm;

anthers slightly curved, 3–3.5 mm.

0.7 mm, surfaces with few straight ridges of papillae along crest, sides with lower, more scattered papillae or ± smooth.

0.6 mm, surfaces crested with irregular, roughly concentric, interrupted rows of laterally flattened tubercles, these in turn vertically grooved.

= 44.

= 22.