Flora of North America species comparison

1–few, few–many branched distally.

simple to openly branched, branches ascending, villous to hispid with septate hairs and loosely tomentose.

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.

± villous to hispid with septate hairs, minutely resin-gland- dotted;

basal winged-petiolate, blades oblong to oblanceolate, 10–15 cm, margins pinnately lobed, lobes acute, finely dentate;

cauline sessile, long-decurrent with narrow wings, linear-oblong to oblanceolate, 1–6 cm, entire or distally serrate with short, spine-tipped teeth.

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

ovoid, 12–30 mm, distally constricted.

many;

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

many;

corollas yellow, all ± equal, 25–35 mm;

corollas of sterile florets slender, inconspicuous.

appendages entire, acute or spine-tipped.

appendages 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, borne singly or in open, few-headed corymbiform arrays, long-pedunculate.

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

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

dark brown, 5–8 mm, glabrous;

pappi of many, brown to blackish, unequal bristles 6–7 mm.

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

phyllaries: bodies greenish or stramineous, ovate to elliptic, glabrous, appendages spreading to reflexed, brown to blackish purple, each with palmately radiating cluster of spines, central spine stout, 1–2.5 cm, base dark brown to black, distally stramineous.

= 24.

= 24.