Flora of North America species comparison

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

erect, usually ± hairy.

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 cauline; opposite or alternate;

sessile or subsessile;

blades (3-nerved near bases) narrowly lanceolate to linear, 8–15 × 0.15–0.5(–1) cm, bases cuneate, margins entire (revolute, abaxial face sometimes obscured by rolled margins), abaxial faces strigose to hispid or hirsute, sometimes (adaxial not) gland-dotted.

1–11 cm.

5–15 cm.

hemispheric, 13–28 mm diam.

shallowly hemispheric, 10–20 mm diam.

10–25;

laminae (15–)25–40 mm.

10–20;

laminae 10–20 mm (abaxial faces gland-dotted).

75+;

corollas 5–7 mm, lobes yellow;

anthers dark brown or black;

appendages usually yellow, sometimes partly dark.

75+;

corollas 4–4.5 mm, lobes yellow;

anthers dark brown or black, appendages dark (style branches usually yellow).

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

25–32 (loose), lanceolate, 4–9 × 1–2 mm, apices acute to slightly acuminate, abaxial faces usually scabrous, rarely glabrous, usually gland-dotted.

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

3–16.

3–4 mm, glabrate;

pappi of 2 aristate scales 3–4.1 mm.

2–3 mm, glabrate;

pappi of 2 aristate scales 1.5–2.1 mm.

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

(oblanceolate) 5.5–6.5 mm, entire or ± 3-toothed (apices purplish, mucronate, gland-dotted).

= 34.

= 34.