Flora of North America species comparison

1–few, few–many branched distally.

1–several, branches ascending, glabrous to ± hirsute.

basal and proximal cauline petiolate or tapering to base, usually absent at anthesis, blades oblong to oblanceolate, 2–15 cm, margins entire to dentate or pinnately lobed;

cauline long-decurrent, blades linear to oblong or oblanceolate, 1–5 cm, entire or dentate.

minutely hispid, resin-gland-dotted;

basal and proximal cauline petiolate, blades 10–25 cm, margins usually 1–2-pinnately divided into linear or oblong segments;

mid and distal cauline smaller, entire or once dissected.

ovoid, 10–15 mm, loosely cobwebby-tomentose or becoming glabrous.

ovoid to hemispheric, becoming campanulate, 15–25 mm.

many;

corollas yellow, those of sterile florets 10–12 mm, slender, inconspicuous, those of fertile florets 10–12 mm.

many;

corollas reddish purple (white), those of sterile florets 35–40 mm, often conspicuously enlarged, those of fertile florets 20–25 mm.

bodies dark green, ovate (outer) to oblong-lanceolate (inner), glabrous or finely arachnoid, margins and erect appendages black, ± fringed distally with slender teeth, inner phyllaries with brownish scarious, expanded, erose dissected appendages.

appendages entire, acute or spine-tipped.

disciform, 1–few at branch tips, borne singly or in open leafy corymbiform arrays, sometimes clustered in distal axils, sessile or pedunculate.

borne singly or few in open cymiform arrays, pedunculate.

dull white or light brown, ca. 2.5 mm, finely hairy;

pappi of many white, unequal, stiff bristles 2.5–3 mm.

brown, 4.5–5 mm, puberulent;

pappi of many unequal stiff bristles, white, 4–5 mm.

phyllaries: bodies ± stramineous, ovate, appendages purplish, spiny-fringed at base, each tipped by slender spine 5–10 mm.

= 24.

= 20 (Russia), 40.