Flora of North America species comparison

1–several, clustered, terete or distally 4-ridged but not angled or winged, 0.8–6 dm, branching all or mostly alternate.

generally single, 4-angled with wings to 0.3 mm wide, 0.3–2(–3.2) dm, branching alternate or proximally occasionally opposite.

basal absent at flowering time, internodes between cauline leaves mostly 1.25+ times as long as subtending leaves;

blade elliptic- or oblong-lanceolate, 1.5–7 cm × 4–12(–16) mm.

all cauline at flowering time;

blade elliptic to ovate or proximal occasionally obovate, 0.6–2(–2.7) cm × 2–9(–13) mm.

open, few-flowered monochasia or solitary flowers at ends of branches;

pedicels 10–90(–110) mm.

open cymes;

pedicels 2–40(–70) mm.

7–12(–14)-merous;

calyx tube obconic to campanulate, 1.5–4 mm, mid- and commissural veins about equally prominent, 4-ridged;

lobes linear to oblong-lanceolate or occasionally narrowly spatulate or ± foliaceous, 4–20 mm;

corolla purplish pink or rarely white, eye yellow, projections of eye into corolla lobes oblong, sometimes shallowly 3-lobed, usually with a red border, tube (3–)4–8 mm, lobes oblanceolate to narrowly spatulate-obovate, (10–)12–25 × 3–11 mm, apex rounded to subacute;

anthers coiling circinately.

5-merous;

calyx tube campanulate, 3.5–8.5 mm, commissural veins more prominent than midveins, ridged, lobes oblong-lanceolate to narrowly ovate-triangular, 3–20 mm;

corolla white to pink, eye white to pale yellow, projections of eye into corolla lobes oblong, without a contrasting border, tube 2–5 mm, lobes spatulate-obovate, 4–10(–13) × 2–8(–11) mm, apex obtuse to subacute;

anthers remaining straight or slightly coiling circinately.

 = 34 + 8B.

 = 28.