Flora of North America species comparison

usually several, erect, unbranched or sparingly branched distally, villous with septate hairs, thinly arachnoid-tomentose, fistulose proximal to heads.

1–several, often forming rounded mounds, puberulent to loosely tomentose.

short-villous and thinly arachnoid, ± glabrate, resin-gland-dotted;

basal and proximal cauline petiolate, blades oblanceolate to narrowly ovate, 10–30 cm, margins entire or shallowly dentate;

cauline sessile, shortly decurrent, not much smaller except those crowded proximal to heads, blades lanceolate to ovate, 5–10 cm, entire, often ± undulate, apices acute.

puberulent to loosely gray-tomentose, becoming ± glabrous, minutely resin-gland-dotted;

proximal leaves petiolate, blades 10–20 cm, 1–3 times pinnately dissected, rosette with central cluster of spines;

mid sessile, not decurrent, blades ovate, usually less than 10 cm, narrowly lobed;

distal blades linear to oblong, entire to shallowly lobed.

ovoid to hemispheric, 25–35 mm.

ovoid, 15–20 × 6–8 mm.

many;

corollas yellow;

corollas of sterile florets slightly expanded, ca. 4 mm;

corollas of disc florets ca. 3.5 mm.

25–40;

corollas purple, all ± equal, 15–24 mm;

sterile corollas slender.

bodies pale green or stramineous, ovate or broadly lanceolate, glabrous, appendages erect to spreading, brown, scarious, abruptly expanded, 1–2 cm wide, ± covering phyllary bodies, lacerate fringed, sometimes tipped by weak spines 1–2 mm, glabrous.

appendages truncate, spineless.

disciform or weakly radiant, borne singly, sessile, closely subtended by clusters of reduced leaves.

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

7–8 mm;

pappi of many setiform scales (“flattened bristles”), 5–8 mm.

white or brown-streaked, 2.5–3.4 mm, glabrous;

pappi 0.

phyllaries: bodies greenish or stramineous, ovate, scarious-margined, appendages stramineous, spiny fringed at base, each tipped by a stout spreading spine 10–25 mm.

= 18 (Russia).

= 20.