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.

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 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.

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.

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

pedicels 10–90(–110) mm.

open cymes or thyrses;

pedicels 1–8(–13) 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 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.

 = 34 + 8B.

 = 32.