Flora of North America species comparison

often spreading or prostrate, usually branched throughout, usually reddish, ± loosely tomentose.

1–several, divaricately much branched, often forming rounded mound, puberulent to loosely tomentose.

mostly cauline, sessile and often short-decurrent or proximal tapering to winged petioles, blades lanceolate to oblanceolate, 6–25 cm, margins coarsely dentate or pinnately lobed, lobes and teeth armed with short, weak spines, faces sparsely to densely hairy with jointed multicellular hairs and slender cobwebby hairs, resin-gland-dotted.

hispidulous to loosely tomentose, ± glabrate, minutely resin-gland-dotted;

proximal leaves petiolate, blades 10–20 cm, margins 1–2 times pinnately lobed or dissected, rosette with central cluster of spines;

mid sessile, not decurrent, blades ± lanceolate, shorter;

distal blades linear to oblong, entire to coarsely dentate or shallowly lobed.

± spheric, 20–40 mm.

ovoid to hemispheric, (10–)13–18 mm.

many;

corollas yellow, those of sterile florets linear, 3-lobed, not exceeding disc corollas, very slender, those of disc florets 19–24 mm.

many;

corollas white, pink, or pale purple, those of sterile florets slender, 15–20 mm, those of fertile florets 15–20 mm.

in several series, tightly overlapping, outer ovate with tightly appressed bases and spreading spine tips, inner lanceolate, tipped by pinnately divided spines more than 5 mm.

appendages truncate, spineless.

disciform, borne singly, sessile, each subtended by involucre-like cluster of leaf-like bracts.

disciform, borne singly or in leafy cymiform arrays, sessile or short-pedunculate.

cylindric, slightly curved, 8–11 mm, with 20 prominent ribs, tipped by a 10-dentate rim, glabrous, attachment scars lateral;

pappi of 2 series of awns, outer 9–10 mm, smooth or ± roughened, inner 2–5 mm, roughened with short spreading hairs.

white- or brown-streaked, 3–4 mm, glabrous;

pappi of white bristles 1–2.5(–3) mm.

phyllaries: bodies greenish or stramineous, ovate, scarious–margined, appendages stramineous, spiny–fringed at base, each tipped by stout spreading spine (0.5–)1–3 cm.

= 22.

= 16, 20.