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.

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 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 or basal sometimes persistent;

basal blades oblong-spatulate to ovate-orbiculate;

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

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

pedicels 10–90(–110) mm.

open cymes;

pedicels 10–60 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(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.

 = 34 + 8B.

 = 38.