Flora of North America species comparison

with branching lateral roots.

1, erect.

usually 1, usually erect.

evenly distributed (proximal often withering before flowering); indistinctly petiolate (bases often weakly clasping);

blades lanceolate to narrowly lanceolate, (3–)7–20 × 1–4 cm, margins sharply and evenly toothed (not lobed or pinnatifid).

basal and cauline; alternate; petiolate or sessile;

blades pinnately nerved, mostly ovate to lanceolate (sometimes pinnately lobed or dissected), ultimate margins entire, denticulate, or toothed, faces glabrous or ± tomentose or villous (often unevenly glabrescent).

cylindric or turbinate, 4–7 mm.

urceolate or cylindric to turbinate, 2–10+ mm diam.

3–5 mm diam.

flat to convex, ± foveolate or smooth, epaleate.

0.

10–100+ (in 1–3+ series), corollas whitish to pale yellow, tubular-filiform, lobes 4–5, deltate, erect.

(3–)10–20(–50+), mostly bisexual and fertile, inner sometimes functionally staminate;

corollas whitish to pale yellow [pinkish], tubes longer than funnelform throats, lobes 4–5, erect to spreading, lance-ovate;

style branches stigmatic in 2 lines, apices truncate-penicillate.

usually 8.

persistent, usually (5), 8, 13, or 21 in 1–2 series, erect (sometimes reflexed in fruit), distinct (margins ± interlocking), lanceolate to linear, equal, margins ± scarious (tips green or with minute dark spots).

of 1–6[–12+] bractlets.

(40–)80–200 in open, corymbiform arrays (or arrays of clusters).

disciform, in cymiform or corymbiform arrays.

1.5–2 mm, usually puberulent in lines along relatively narrow ribs, sometimes glabrous.

(stramineous to brown or purple) ± prismatic and 5-angled or -ribbed or ± obovoid to ± fusiform and 10–20-nerved, glabrous or puberulent (on or between ribs or nerves);

pappi readily falling, of 60–120, white [reddish], barbellulate bristles.

= 20.

= 60.