Flora of North America species comparison

terete, glabrous (sometimes glaucous).

usually erect, usually branched (terete or square, often vernicose with resinous exudates).

basal persistent, petiolate;

cauline alternate, petiolate or sessile;

blades cordate, deltate, elliptic, hastate, ovate, reniform, or sagittate, 2–35 × 0.5–52 cm, sometimes (proximal) pinnately or palmately lobed, bases oblique, truncate, attenuate, cordate, sagittate, or hastate, ultimate margins toothed, apices acute, faces glabrous, hispid, or scabrous.

basal and cauline (basal persistent or withering before flowering); whorled, opposite, subopposite, or alternate (sometimes all conditions on one plant);

petiolate or sessile;

blades (1- or 3-nerved) deltate, elliptic, linear, ovate, or rhombic, sometimes 1–2-pinnately lobed or -pinnatifid, bases cordate or truncate to cuneate, margins entire or toothed, faces glabrous or hairy (sometimes stipitate-glandular).

campanulate to hemispheric, 10–30 mm diam.

flat to slightly convex, paleate (paleae oblong, lanceolate, or linear).

6–12;

corollas yellow.

8–35+ in 1–4 series, pistillate, fertile;

corollas yellow or white.

20–85;

corollas yellow.

20–200+, functionally staminate;

corollas yellow or white, tubes much shorter than narrow, cylindric throats, lobes 5, deltate.

11–18 in 2–3 series, outer appressed to reflexed, apices obtuse to cuspidate, abaxial faces sparsely scabrous.

persistent, 11–45 in 2–4 series (outer broader, foliaceous, inner smaller, thinner, each subtending a ray floret).

radiate, in paniculiform or racemiform arrays.

6–12 × 4–10 mm;

pappi 1–4 mm.

(black to brown) obflattened (± winged, shed alone without accessory structures);

pappi 0, or persistent, of 2 awns (± confluent with cypsela shoulders and wings).

= 7.

= 14.