Flora of North America species comparison

erect, 5–30 dm, scabrous to scabro-hispidulous.

erect, distally densely hispid.

cauline; mostly alternate;

petioles 0–2 cm;

blades (light green to gray-green, 1-nerved, conduplicate) lanceolate, 10–30 × 2–5.5 cm, bases cuneate, margins usually entire, sometimes serrulate, abaxial faces scabrous to scabro-hispid, gland-dotted.

mostly basal; opposite;

petioles obscure (intergrading with blades);

blades obovate to orbiculate, 4.6–14.5 × 2.1–12 cm, bases broadly cuneate to rounded, margins entire or serrulate, abaxial faces strigoso-hispid, not gland-dotted (cauline usually much smaller, alternate distally).

1–11 cm.

10–20 cm.

hemispheric, 13–28 mm diam.

shallowly hemispheric, (15–25 ×) 5–8 mm.

10–25;

laminae (15–)25–40 mm.

0 or 2–8;

laminae (sometimes purplish) 1–2(–10) mm.

75+;

corollas 5–7 mm, lobes yellow;

anthers dark brown or black;

appendages usually yellow, sometimes partly dark.

100–150+;

corollas 7–8 mm, lobes reddish;

anthers dark, appendages dark.

30–40, lanceolate, 14–20 × 2–3 mm, (margins ciliate) apices acute to attenuate, abaxial faces canescent, gland-dotted.

(often dark purple) 25–33, lanceolate to ovate, 10–14 × 3–5 mm, apices acute to acuminate, abaxial faces hispid or glabrous.

(1–)3–15 (often in racemiform to spiciform arrays).

usually borne singly.

3–4 mm, glabrate;

pappi of 2 aristate scales 3–4.1 mm.

3–4 mm, glabrate;

pappi of 2 (often unequal) aristate scales 0.5–2.9 mm.

7–11 mm, entire or 3-toothed (apices greenish, mucronate, hairy).

9–10 mm, subentire to 3-toothed (apices purplish, mucronate).

= 34.

= 34.