Flora of North America species comparison

usually single, occasionally 2–several, 4-angled with wings 0.1–0.5 mm wide, 1.5–5(–7.5) dm, branching all opposite or secondary and/or tertiary occasionally alternate.

single, 4-angled with wings 0.2–0.3 mm wide, (0.5–)3–7.5(–9) dm, branching proximally mostly opposite, distally mostly alternate.

basal and cauline or only cauline present at flowering time;

basal blades spatulate-obovate;

cauline blades linear-oblong to ovate-lanceolate, 0.8–2.5(–6) cm × 3–8(–18) mm.

all cauline at flowering time or basal sometimes persistent;

basal blades oblong-spatulate to ovate-orbiculate;

cauline blades lanceolate to widely ovate, 1–4 cm × 5–30(–40) mm.

cymes of compact cymules;

pedicels 1–2(–4) mm.

open cymes;

pedicels 10–60 mm.

5-merous;

calyx tube widely obconic to campanulate, 1.5–3(–3.5) mm, mid- and commissural veins about equally prominent, low-ridged, lobes linear-subulate or rarely wider, 2–8(–11) mm;

corolla white throughout (sometimes drying yellow or salmon) or occasionally with a yellow eye, projections of eye into corolla lobes, when present, triangular, without a contrasting border, tube 2.5–7 mm, lobes oblanceolate to narrowly spatulate-obovate, 4.5–15 × 1.5–6 mm, apex rounded to obtuse;

anthers coiling circinately.

5(or 6)-merous;

calyx tube shallowly campanulate, 1–2 mm, mid- and commissural veins about equally prominent, low-ridged, lobes linear to narrowly oblong-lanceolate or occasionally ± foliaceous, 4–15(–18) mm;

corolla pink or occasionally white (sometimes drying orange), eye greenish yellow, projections of eye into corolla lobes triangular, usually with dark red border, tube 4–7 mm, lobes ± narrowly spatulate-obovate, 6–22 × 2–9(–11) mm, apex rounded to subacute;

anthers coiling circinately.

 = 32, 34.

 = 38.