Flora of North America species comparison

usually 1, usually erect, branched distally or throughout, glabrous or hairy (sometimes hispid to setose).

on proximal 1/2–2/3 of each stem;

blades of undivided cauline leaves obovate to spatulate, margins denticulate, midribs usually prickly-setose.

basal and cauline or mostly cauline (at flowering);

sessile or petiolate;

blades orbiculate, ovate, oblong, or lanceolate to oblanceolate, linear, or filiform, margins entire or denticulate to pinnately lobed (faces glabrous or hairy, often ± setose).

not inflated distally, sometimes bracteate.

12–15 mm.

campanulate to cylindric, 2–5[–8+] mm diam.

flat to convex, pitted, glabrous, epaleate.

10–15;

corollas yellow, usually deliquescent.

6–50+;

corollas yellow, bluish, or whitish.

usually reflexed in fruit.

5–13+ in ± 2 series (erect or reflexed in fruit), lanceolate to linear, usually subequal to equal, margins sometimes scarious, apices obtuse to acute.

of 3–10+, deltate to lanceolate bractlets in 2–3 series (sometimes intergrading with phyllaries).

in paniculiform arrays.

borne singly or in corymbiform to paniculiform arrays.

bodies purplish to blackish, ± flattened, ± elliptic, 3.5–4 mm, beaks ± filiform, 2.5–3.5 mm, faces 5–7-nerved;

pappi white, 5–6 mm.

reddish brown, tan, whitish, or purplish to blackish, bodies compressed to flattened, elliptic to oblong, beaks stout (0.1–1 mm, gradually or weakly set off from bodies) or filiform (2–6 mm, sharply set off from bodies), ribs 1–9 on each face, faces often transversely rugulose, usually glabrous;

pappi persistent (borne on discs at tips of cypselae or beaks), obscurely double (spp.

–2), each a minute, erose corona 0.05–0.2 mm subtending 40–80+, white or fuscous, ± equal, barbellate to barbellulate bristles in 1–2 series, or simple (spp.

–10) of 80–120+, white, ± equal, barbellulate to nearly smooth bristles in 2–3+ series.

= 9.

= 18.