Flora of North America species comparison

1–few, few–many branched distally.

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

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.

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.

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

ovoid to hemispheric, 25–35 mm.

many;

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

many;

corollas yellow;

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

corollas of disc florets ca. 3.5 mm.

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 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.

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

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

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

7–8 mm;

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

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

= 24.

= 18 (Russia).