OregonFlora species comparison

branched above, sparsely tomentose;

gland-dotted.

usually much branched, sparsely to densely tomentose.

villous, thinly to densely tomentose;

gland-dotted;

basal and lower cauline blades oblong to oblanceolate, 2–15 cm;

margins dentate, pinnately lobed or entire, petiolate to tapering at base; upper cauline blades linear to oblong, 1–5 cm, bases decurrent;

margins dentate to entire.

cauline, rarely also basal, oblanceolate to elliptic, 6–25 cm;

margins shallowly to deeply pinnately lobed, dentate, armed with short weak spines;

surfaces sparsely to densely tomentose, becoming glabrate;

gland-dotted;

petioles winged.

1–few in corymb-like arrays or heads solitary.

solitary heads.

ovoid, 8–15 mm.

± spherical, 20–40 mm.

yellow, sterile florets ? fertile florets, fertile florets 10–14 mm.

yellow, sterile florets 3-lobed, not exceeding fertile florets, fertile florets 19–24 mm.

outer ovate, bases spiny-fringed;

surfaces tomentose to glabrate;

central spines slender, 5–10 mm, often purple; inner entire; acute or spine-tipped.

tightly overlapping; outer ovate, green or straw-colored, with spreading spine tips;

central spines 8–15 mm; inner lanceolate, purple to straw-colored;

spines pinnately divided;

central spines 5–15 mm, sessile.

2.5–3 mm, white or light brown, finely hairy, pappi of unequal, white bristles, 1.5–3 mm.

8–11 mm; straw-colored, with 20 prominent ribs;

pappi in 2 series of awns; outer 9–10 mm; inner 2–5 mm.

disciform.

disciform, sessile, subtended and obscured by clusters of leaf-like bracts.

=24.

=22.