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.

usually single, rarely 2 or 3, proximally terete, distally 4-angled but not winged, 1.5–7 dm, branching all opposite or distally all or partly 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.

cauline and usually also basal present at flowering time;

basal blades spatulate;

cauline blades oblong to lanceolate, 1–3(–5) cm × 3–10(–16) mm.

cymes of compact cymules;

pedicels 1–2(–4) mm.

open cymes or thyrses;

pedicels 1–8(–13) 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-merous;

calyx tube turbinate to campanulate, 1–4 mm, mid- and commissural veins about equally prominent, with low, narrow ridges, lobes linear-subulate, (4–)6–10(–15) mm;

corolla pink or rarely white, eye greenish yellow, projections of eye into corolla lobes triangular, usually with a dark red border, tube 3–6 mm, lobes oblanceolate to narrowly spatulate-obovate, 5–20 × 2–8 mm, apex obtuse to subacute;

anthers coiling circinately.

 = 32, 34.

 = 32.