Flora of North America species comparison

not developed;

roots often long and rhizomelike, non-tuberiferous.

usually not developed;

roots often long and rhizomelike, lignescent, tuberiferous.

usually few- to several-branched distally, sometimes unbranched, 20–80 cm, faces strongly unequal, 1 pair of opposite faces rounded to convex, the other narrower, flat or concave, without wings or very narrowly winged, internodes and nodes usually hirsute-villous, rarely glabrous or glabrate, hairs gland-tipped.

unbranched to several-branched, 40–70 cm, faces subequal, angles weakly ridged, sometimes narrowly winged, internodes glabrous, nodes sparsely hirsute to villous, hairs yellowish, eglandular.

sessile, subsessile, or petioles 0.5–1.5 mm;

blade linear, lanceolate, elliptic, or narrowly ovate, rarely linear-filiform, 2–4 cm × (5–)8–15(–20) mm, margins serrate, surfaces loosely strigose to strigose-hirsute or villous.

sessile to subsessile;

blade usually lanceolate, 2–3 cm × 3–9 mm, margins shallowly serrate to barely crenulate, apex sometimes minutely apiculate, surfaces glabrous or sparsely long-strigose to ascending-villous.

diffuse, not obscured by bracts.

diffuse, not obscured by bracts.

hypanthium ovoid to subglobose, about as long as the constricted neck, 6–10 mm, hirsute-villous, glabrous, or glabrate, hairs gland-tipped;

calyx lobes narrowly triangular, apices acute to acuminate, narrowed to linear-oblong extensions;

petals spreading, white or pale to dull lavender, 1.2–1.5 cm;

anthers curved, 5–8 mm.

hypanthium ovoid, about as long as the constricted neck, 7–10 mm, hispid-hirsute at neck, rim, and calyx lobes, hairs yellowish, eglandular;

calyx lobes triangular, apices acuminate-aristate;

petals spreading, dull lavender, 1–2 cm;

anthers curved, 5–6 mm.

0.7 mm, surfaces longitudinally ridged with contiguous tubercles, papillae, or laterally flattened domes.

ca 0.7 mm, surfaces with irregular, concentric ridges, with few isolated domes or papillae.

= 22.

= 22.