Flora of North America species comparison

several, clustered, terete, 5–14 dm, branching opposite throughout.

single, terete, 1.5–9(–11) dm, branching alternate.

all cauline at flowering time;

blade lanceolate to ovate-oblong or ovate, 2.5–6(–8.5) cm × 5–30(–45) mm.

all cauline at flowering time;

blade mostly linear, 1–5 cm × 0.5–2 mm or those near base to 5 mm wide, distal leaves filiform.

corymboid dichasia of compact cymules;

pedicels 1–5 mm.

open, few-flowered cymes or solitary flowers;

pedicels (20–)40–120 mm.

5-merous;

calyx tube campanulate, 1–2 mm, mid- and commissural veins about equally prominent, not ridged or with low, narrow ridges, lobes triangular to linear-subulate, 0.1–3 mm;

corolla white or cream throughout, tube 2–4 mm, lobes oblong-oblanceolate, 4–7(–9) × 2–3(–4) mm, apex rounded to obtuse;

anthers recurving.

5-merous;

calyx tube campanulate, 6–25(–30) mm, midveins slightly more prominent than commissural veins, veins not ridged or midveins low-ridged, lobes subulate to linear;

corolla pink or occasionally white, eye yellow, projections of eye into corolla lobes oblong, usually with red border, tube 3–8 mm, lobes narrowly to medium-widely obovate, (13–)17–30 × 5–15 mm, apex rounded to subacute;

anthers coiling circinately.

 = 36.