Flora of North America species comparison

usually 1, erect to ascending, usually branched distally, glabrous.

blades oblong to obovate, mostly 30–55+ × 15–30+ mm, mostly 2–3-pinnately lobed, ultimate margins dentate.

mostly cauline; alternate; petiolate or sessile;

blades obovate to oblong (bases sometimes ± clasping), usually 1–3-pinnately lobed, ultimate margins usually dentate, rarely entire, faces glabrous.

± hemispheric or broader, 15–25+ mm diam.

convex to hemispheric, epaleate.

pale yellow, sometimes white-tipped, laminae oblong to linear, 15–25 mm.

10–21+, pistillate, fertile;

corollas mostly yellow, sometimes paler distally, laminae linear, oblong, or ovate.

60–150+, bisexual, fertile;

corollas ± yellow, tubes ± cylindric (basally ± dilated, ± gland-dotted), throats funnelform, lobes 5, narrowly deltate (each with a resin sac).

persistent, 25–60+ in 3–4 series, distinct, ovate or obovate to lance-deltate or lanceolate (not carinate, usually each with a resin canal), margins and apices (colorless or stramineous to pale brown) scarious (tips of inner often ± dilated).

radiate, borne singly or in 2s or 3s.

dimorphic: outer (ray) 3-angled (each angle ± winged, wings not spine-tipped);

inner (disc) compressed-prismatic to columnar (adaxial, rarely abaxial, angles sometimes ± winged, wings not spine-tipped);

ribs usually 10, faces glabrous, sometimes gland-dotted between ribs (pericarps without myxogenic cells or resin sacs; embryo sac development monosporic);

pappi 0.

triquetrous, 2.5–3 mm, angles ± winged, faces obscurely nerved or ribbed;

disc cypselae ± prismatic, ± compressed, 2.5–3 mm, obscurely ribbed, sometimes with adaxial (rarely the abaxial) rib ± winged.

= 9.

= 18.