Theodore M. Barkley+ in Flora of North America (vol. 20)
15-150+ cm (glabrous or scattered-hairy, especially distally [arachno-tomentose]; roots fibrous).
usually 1, erect.
basal and cauline; alternate; petiolate (petiole bases dilated, ± sheathing stems); blades (basal and proximal largest, cauline smaller distally) palmately [palmati-pinnately] nerved, orbiculate to reniform [elliptic, lanceolate, oblanceolate, ovate], margins dentate [denticulate, serrate, dissected], faces glabrous or sparsely pilosulous (mostly on nerves) [glaucous; arachno-tomentose].
radiate [discoid], in corymbiform [racemiform or spiciform] arrays.
0 [1-2+ bractlets].
cylindric to campanulate, [3-]16-28 mm diam.
persistent, [5-]8-13+ in 1-2 series, erect, distinct (margins interlocking) [connate at bases], mostly oblong or lanceolate to linear, subequal, margins usually ± scarious (tips greenish or reddish, not blackened).
flat to convex, smooth, epaleate.
[0 or 1-7] 8-14+, pistillate, fertile; corollas (laminae prominent, showy) orange to orange-yellow or brick-red [yellow].
[5-]12-100+, bisexual, fertile; corollas orange-yellow to orange, becoming brownish [yellow], tubes longer than cylindric throats, lobes 5, recurved, lance-linear; style branches: stigmatic areas continuous, apices truncate or rounded-truncate.
(stramineous to brownish) ± ellipsoid [cylindric or fusiform], 5[-10]-ribbed or -nerved, glabrous;
persistent (fragile), of 40-100+, reddish [sordid, brownish, purplish], barbellate to barbellulate bristles ([shorter than] longer than cypselae).
Species within checklist:
CoNPS: American Basin Field Trip 1995