Flora of North America species comparison

1–several, clustered, proximally terete, distally sometimes ± 4-angled but not winged, 2.5–10.5 dm, branching opposite throughout.

usually single, occasionally 2–several, terete or distally ± 4-angled but not winged, 0.8–5 dm, branching all or mostly alternate.

all cauline at flowering time;

blade linear-lanceolate to narrowly or occasionally widely elliptic-ovate, 1–4(–6) cm × 3–14(–22) mm.

all cauline at flowering time;

blade elliptic to widely spatulate, 1–6(–10) cm × 4–30 mm.

corymboid dichasia of compact cymules;

pedicels 1–8(–15) mm.

open, few-flowered cymes;

pedicels (10–)30–60 mm.

5(or 6)-merous;

calyx tube shallowly campanulate, 1–2(–3) mm, midveins somewhat more prominent than commissural veins, low-ridged, commissural veins scarcely ridged, lobes narrowly lanceolate to filiform, (2–)4–9(–14) mm;

corolla white throughout (sometimes drying cream to yellow), tube 2.5–6 mm, lobes oblanceolate, (5–)7–21 × 2.5–8 mm, apex rounded;

anthers recurving.

5–7-merous;

calyx tube shallowly campanulate, 1.5–5 mm, midveins slightly more prominent than commissural, veins not ridged or midveins with low, narrow ridges, lobes oblanceolate to spatulate or ± foliaceous, 8–25(–32) mm;

corolla pale pink proximally, distally white, or white throughout except for eye, eye yellow, projections of eye into corolla lobes triangular, without a contrasting border, tube 3–6 mm, lobes oblanceolate to narrowly spatulate-obovate, 6–15 × 2–6 mm, apex rounded to obtuse;

anthers becoming slightly recurved.

 = 36.

 = 64.