Flora of North America species comparison

1–several, erect, loosely arachnoid-tomentose, glandular-pilose;

branches several to many, spreading.

blades oblanceolate to oblong or elliptic, 20–70 × 5–16 cm, strongly undulate, shallowly to deeply pinnatifid, lobes coarsely toothed or with triangular secondary lobes, main spines 3–15 mm, abaxial faces more densely tomentose, adaxial densely glandular with short, multicellular trichomes and ± tomentose with fine, arachnoid, non-septate trichomes;

basal often present at flowering, petiolate;

principal cauline well distributed, becoming sessile, gradually reduced distally, bases auriculate-decurrent with broad, spiny-margined wings 3 cm or less;

distal cauline leaves progressively reduced, ± bractlike.

0–7 cm.

(green to purple), hemispheric or campanulate, 1.5–3 × 2–5 cm, glabrous or puberulent.

white to pinkish or lavender, 14.5–22 mm, tubes 5–8 mm, throats 4.5–9 mm, lobes 3–8 mm;

style tips 2.5–4.5 mm.

in 6–10 series, imbricate, ovate to lanceolate, abaxial faces without glutinous ridge;

outer and mid bases appressed, short, bodies entire to erose or ciliolate (rarely outer spine-margined), apices spreading to recurved or reflexed, long, dilated, adaxially puberulent, spines 1–6 mm;

apices of inner erect or reflexed, flattened or tipped with short spines.

few–many, ± nodding, in paniculiform or corymbiform arrays, bracts leafy or much reduced.

brownish, 3.4–5 mm, apical collars tan;

pappi 12–15 mm.

perennials, 50–220 cm; woody tap-rooted caudices with numerous coarse, fibrous lateral roots, sometimes forming new rosettes from root sprouts.