Flora of North America species comparison

4–20 cm.

5–30 cm.

mostly whorled at stem apex, some alternate on proximal stem;

blades of distal leaves lanceolate to lanceolate-elliptic, 2.5–10(–12) cm × 6–45 mm, widest at midlength, (proximal leaves abruptly much smaller, 0.1–0.6 cm × 0.3–1.5 mm, ± scalelike), apex acute to acuminate.

whorled or densely crowded at stem apex, becoming alternate and progressively or abruptly smaller proximally;

blades of distal leaves obovate or oblanceolate to spatulate (sometimes elliptic), 2–6 cm × 9–26 mm, widest beyond midlength, (proximal leaves smaller, 0.2–2 cm × 1–13 mm, only proximalmost ± scalelike), apex acute to rounded or obtuse.

1–3(–5), 1.5–4 cm, shorter than leaves, usually sparsely stipitate-glandular.

1–2, (1.4–)1.8–5.5 cm, equaling or longer than leaves, sparsely to densely glandular, at least proximally.

corolla white, 5.5–8(–10) mm, lobes ovate to narrowly lanceolate, apex acute to acuminate.

corolla usually white, 5–9 mm, lobes ovate to broadly elliptic or lanceolate, apex acute to acuminate (or apiculate).

= 96.

= 84; 70+, 90, 100, 110, 130, 160, 170 (all Siberia);

ca. 128 (Norway); 112, 160 (Europe); 170 (Belarus).