Flora of North America species comparison

terete, hirsute, hispid, or scabrous.

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

basal persistent, petiolate or sessile;

cauline petiolate or sessile;

blades lanceolate, linear, ovate, or rhombic, 4–60 × 1–30 cm, usually (proximal) 1–2-pinnately lobed, bases attenuate to truncate, ultimate margins unevenly toothed or entire, apices acute, faces hirsute, 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).

27–38;

corollas yellow.

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

corollas yellow or white.

100–275;

corollas yellow.

20–200+, functionally staminate;

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

25–45 in 2–3 series, outer reflexed or appressed, apices acuminate to caudate, abaxial faces hispid to scabrous, ± stipitate-glandular.

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

radiate, in paniculiform or racemiform arrays.

10–18 × 6–12 mm;

pappi 1–3 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.