General: Perennial herb from a taproot or woody stem-base; stems erect, simple or several, branched, glabrous below, fine-hairy above, 30-80 cm tall.
Leaves: Basal leaves lacking; stem leaves egg-shaped to oblong in outline, alternate, stalked, 1-2 times pinnately cut, 4-10 cm long, 1-6 cm wide, coarsely rounded or pointed at the tips, finely hairy, at least beneath.
Flowers: Heads with ray and disk flowers, several, terminal on the branches in a short, flat- to round-topped inflorescence; involucres 2-3 mm tall; involucral bracts lanceolate, in 2-3 series, keeled, leathery, sparsely hairy with a narrow translucent margin; ray flowers white, mostly 15-30, 1-2 cm long; disk flowers yellow, 2-3 mm long, somewhat glandular below.
Fruits: Achenes squared off at the top, cylindric or nearly so, 8- to 10-nerved; pappus lacking or a minute crown.
If more than one illustration is
available for a species (e.g., separate illustrations were provided for two
subspecies) then links to the separate images will be provided below.
Note that individual subspecies or varietal illustrations are not always available.
