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, terete, 2.5–8(–10) dm, branching all or 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.

basal and cauline usually present at flowering time;

basal blades oblanceolate to spatulate, 4–10 cm × 9–25 mm;

cauline blades abruptly differentiated, linear to lanceolate, 1.5–5(–6.5) cm × 1–8(–15) mm.

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

pedicels 10–90(–110) mm.

flowers solitary or paired at ends of branches;

pedicels (30–)80–120 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.

8–12(–14)-merous;

calyx tube shallowly campanulate, (2–)3–4(–8) mm, mid- and commissural veins about equally prominent, not ridged;

lobes narrowly linear to subulate, 4–20 mm;

corolla pink or rarely white, eye yellow, projections of eye into corolla lobes oblong, usually with a red border, tube 5–9 mm, lobes narrowly spatulate-obovate, 16–35 × 5–12 mm, apex rounded to obtuse;

anthers coiling circinately.

 = 34 + 8B.

 = 36.