Willowleaf Yellowhead

Plants 20–80+ cm. Leaves: basal blades lanceolate, 2–6 cm × 5–15(–30) mm; cauline blades broadly elliptic to lanceolate, (3–)5–7+ cm × 12–20 mm, bases cordate, clasping (faces usually glabrous, adaxial venation raised, reticulation prominent). Involucres 8–12(–20) mm diam. Outer phyllaries lance-linear, 5–7 × 1.5–2.5 mm; inner similar, more scarious. Ray florets 35–70; corolla laminae 10–15+ mm. Disc corollas 5–7+ mm. Cypselae 1.5–2 mm, glabrous; pappi of 30–40+, distinct or basally connate, barbellate bristles 7–8 mm. 2n = 16.