Flora of North America species comparison

usually strictly erect.

erect, simple or branched (usually distally).

mostly 10–25(–40) mm;

blades linear or lobed (lobes 3–7+, linear to filiform), faces scaberulous (hairs ± conic, 0.1 mm) and gland-dotted.

mostly cauline; mostly opposite (distal sometimes alternate); petiolate or sessile;

blades linear to filiform or 1–2-pinnately lobed (lobes 3–7+, linear to filiform), ultimate margins entire, faces sparsely hairy (hairs bulbous, conic, or fusiform, 0.1–0.3 mm), glabrescent, usually gland-dotted.

mostly (3–)8–25(–30+) mm.

obconic or obpyramidal, 4–6+ mm (each often subtended by 1–3, lanceolate bractlets).

obconic-obpyramidal to ± turbinate or hemispheric, 3–6 mm diam. (subtended by 0–3 bractlets).

convex, pitted, epaleate.

usually 1(–2), sometimes 0;

corollas yellow to white, laminae 0.8–1.2+ mm.

0 or 1–2, pistillate, fertile;

corollas yellow or white.

2–6(–8+);

corollas yellow (sometimes with purple), 1.5–2 mm.

2–8(–30+), bisexual, fertile;

corollas yellow to yellowish, sometimes red-tipped (± stipitate-glandular), tubes shorter than or about equaling campanulate to funnelform throats, lobes 5, deltate.

4–6, green to purple, weakly carinate, oblanceolate to obovate, gland-dotted, otherwise usually glabrous.

persistent, 4–6+ in 1–2 series (spreading or reflexed in fruit, distinct, obovate to oblanceolate, subequal, thin-herbaceous to membranous, margins membranous, often purplish or yellowish).

radiate or discoid, usually in loose, corymbiform to paniculiform arrays.

blackish to buff, 3–4 mm, hirsutulous to villous, especially on angles;

pappi of 8 white to tawny or purplish, obovate-rounded or elliptic to lanceolate scales 1–2.5 mm (sometimes some or all ± aristate).

narrowly obpyramidal, 4-angled, finely nerved, ± hirsutulous to villous (at least at bases and/or on angles);

pappi persistent, of 8+ spatulate to lanceolate (basally and/or medially thickened, distally and/or laterally scarious) scales (all, some, none, or the alternate ones ± aristate).

= 11.

= 20, 22, 40.