Flora of North America species comparison

strictly annual, disintegrating in 1st year;

blade elliptic or ovate to broadly ovate, 25+ mm wide, leathery, base rounded to lobate or cordate, margins crenate, teeth apices obtuse to rounded, surfaces hairy;

basal veins extending into distal 1/2 of blade, lateral veins 3–6 on each side of midvein.

strictly annual, disintegrating in 1st year;

blade narrowly ovate to ovate or oblong-ovate, 25+ mm wide, slightly leathery, base obtuse, truncate, rounded, or cordate, margins crenate, teeth apices acute to obtuse, surfaces glabrous or sparsely hairy;

basal veins extending through proximal 1/2 of blade, lateral veins 5–12 on each side of midvein.

erect, to 40 cm in fruit;

sterile bracts 10–30, ovate-spatulate, largest 1+ cm;

flowers 100+, densely aggregated (separating in fruit).

erect, to 30 cm in fruit;

sterile bracts 11–20, ovate-spatulate, largest 1+ cm;

flowers 100+, densely aggregated (separating in fruit).

epipetalous.

inserted on receptacle.

puberulent to villous;

ovules 17–40.

puberulent to villous at apex;

ovules 17–40.

hairy.

densely hairy.

4.

3(or 4).

(3 or)4, apex entire or erose;

corolla yellow, bilabiate, tubular to ellipsoid, longer than calyx, hairy, lateral and abaxial petals connate ca. 1/2 their lengths, tube conspicuous.

3 (abaxial petals sometimes with numerous subsidiary lobes), apex entire or erose;

corolla pink, bilabiate, tubular to ellipsoid, 2–3 mm longer than calyx, glabrous, lateral and abaxial petals of abaxial lip connate 1/2+ their lengths, abaxial and adaxial lips sometimes basally adnate slightly to stamen filaments, tube absent.